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I'm trying to create an effect where you click on a thumbnail image, and the link to the thumbnail will replace the main image, but fade it in. This is the code I'm currently using:

$(".thumbs a").click(function(e) {
    e.preventDefault();
    $imgURL = $(this).attr("href");
    $(".boat_listing .mainGallery").fadeIn(400, function() {
        $(".boat_listing .mainGallery").attr('src',$imgURL);
    });
});

This works and replaces the image without a fade effect. What do I need to change to get the fadeIn effect to work?

  
shareimprove this question
up vote67down voteaccepted

You have to make it fadeOut() first, or hide it.

Try this :

$(".thumbs a").click(function(e) {
    e.preventDefault();
    $imgURL = $(this).attr("href");
    $(".boat_listing .mainGallery")
        .fadeOut(400, function() {
            $(".boat_listing .mainGallery").attr('src',$imgURL);
        })
        .fadeIn(400);
});

It should fadeOut the image, then change the src when it's hidden, and then fadeIn.

Here's a jsFiddle example.

shareimprove this answer
up vote29down vote

I thing instead of using FadeIn and fadeOut, its better to use fadeTo functionality as fadeIn and fadeOut created a time gap between them for few micro-seconds.

I have used above code from Sylvain : thanks to him

$("#link").click(function() {

  $("#image").fadeTo(1000,0.30, function() {
      $("#image").attr("src",$("#link").attr("href"));
  }).fadeTo(500,1);
  return false;
});
shareimprove this answer
   
I had the same issue; thanks for this fix. – John 'Mark' Smith Apr 15 '14 at 15:36
   
I had issues with making fadeIn/fadeOut work for Firefox. This solution works for all browsers. Thanks! – DIGApr 9 '15 at 17:53
   
This works better for me. Thanks! – Juni Brosas Jun 18 '15 at 7:24
   
Yeah, this solution is better, thanks – punov Jan 27 '16 at 8:16
up vote0down vote

You cannot fade-in something that is already at 100% alpha :)

In other words, you either fade it out or hide it, and then fade it in.

I made this example, basically, I hide it and then fade it:

http://jsfiddle.net/uGFMt/

shareimprove this answer
up vote0down vote

I reproduced the given samples above. It gives a strange flickering, which I found that it waits for image to load after it's opacity is restored to 1. I modified the code by Sandeep.

$("#link").click(function() {

$("#image").fadeTo(1000,0.30, function() {
  $("#image").attr("src",$("#link").attr("href"));
  $("#image").on('load', function(){
    $("#image").fadeTo(500,1);
  });
 });
 return false;
});`
shareimprove this answer


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Example

Alert a text when an <input> field is changed:

$("input").change(function(){
    alert("The text has been changed.");
});
Try it Yourself »

Definition and Usage

The change event occurs when the value of an element has been changed (only works on <input>, <textarea> and <select> elements).

The change() method triggers the change event, or attaches a function to run when a change event occurs.

Note: For select menus, the change event occurs when an option is selected. For text fields or text areas, the change event occurs when the field loses focus, after the content has been changed.

Syntax

Trigger the change event for the selected elements:

$(selector).change()Try it

Attach a function to the change event:

$(selector).change(function)Try it


ParameterDescription
functionOptional. Specifies the function to run when the change event occurs for the selected elements



jQuery Change 이벤트에서 input, textarea 에서 change 가 trigger 되는 경우는, 해당 박스의 데이터가 바뀌고 나서 포인터가 다른곳으로 눌러졌을때 발동된다. (즉 그 칸안에 있으면 안된다는 소리다)

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(PHP 4, PHP 5, PHP 7)

array_push — 배열의 끝에 하나 이상의 원소를 넣는다

설명 ¶

int array_push ( array &$array , mixed $var [, mixed $... ] )

array_push()는 array를 스택으로 취급하고, array 끝에 전달되어진 변수를 넣는다. array의 길이는 집어넣은 변수의 수만큼 증가한다. 다음과 같은 효과를 갖는다:

<?php
$array[] = $var;
?>
각 var에 대해 반복된다.

Note: array_push()를 하나의 원소를 넣는 데 사용한다면, $array[] = 을 사용하는 것이 좋습니다. 함수 호출의 오버헤드가 없기 때문입니다.

Note: array_push()에 첫번째 인수가 배열이 아니면 경고가 발생합니다. 이는 새 배열이 생성될 때 $var[] 동작과 다릅니다.

인수 ¶

array

입력 배열.

var

넣을 값.

반환값 ¶

배열에 새로 추가된 원소의 수를 반환한다.

예제 ¶

Example #1 array_push() 예제

<?php
$stack = array("orange", "banana");
array_push($stack, "apple", "raspberry");
print_r($stack);
?>

위 예제의 출력:

Array
(
    [0] => orange
    [1] => banana
    [2] => apple
    [3] => raspberry
)

참고 ¶

  • array_pop() - 배열의 마지막 원소 빼내기
  • array_push()
  • array_unshift() - 배열의 맨 앞에 하나 이상의 원소를 첨가
add a note add a note

User Contributed Notes 29 notes

673
Rodrigo de Aquino ¶
5 years ago
If you're going to use array_push() to insert a "$key" => "$value" pair into an array, it can be done using the following:

    $data[$key] = $value;

It is not necessary to use array_push.
408
bxi at apparoat dot nl ¶
9 years ago
I've done a small comparison between array_push() and the $array[] method and the $array[] seems to be a lot faster.

<?php
$array = array();
for ($x = 1; $x <= 100000; $x++)
{
    $array[] = $x;
}
?>
takes 0.0622200965881 seconds

and

<?php
$array = array();
for ($x = 1; $x <= 100000; $x++)
{
    array_push($array, $x);
}
?>
takes 1.63195490837 seconds

so if your not making use of the return value of array_push() its better to use the $array[] way.

Hope this helps someone.
8
andrew at cgipro dot com ¶
12 years ago
Need a real one-liner for adding an element onto a new array name?

$emp_list_bic = $emp_list + array(c=>"ANY CLIENT");

CONTEXT...
drewdeal: this turns out to be better and easier than array_push()
patelbhadresh: great!... so u discover new idea...
drewdeal: because you can't do:   $emp_list_bic = array_push($emp_list, c=>"ANY CLIENT");
drewdeal: array_push returns a count and affects current array.. and does not support set keys!
drewdeal: yeah. My one-liner makes a new array as a derivative of the prior array
9
aaron dot hawley at uvm dot edu ¶
12 years ago
Skylifter notes on 20-Jan-2004 that the [] empty bracket notation does not return the array count as array_push does.  There's another difference between array_push and the recommended empty bracket notation.

Empy bracket doesn't check if a variable is an array first as array_push does.  If array_push finds that a variable isn't an array it prints a Warning message if E_ALL error reporting is on.

So array_push is safer than [], until further this is changed by the PHP developers.
3
mrgreen dot webpost at gmail dot com ¶
1 year ago
Rodrigo de Aquino asserted that instead of using array_push to append to an associative array you can instead just do...

        $data[$key] = $value;

...but this is actually not true. Unlike array_push and even...

        $data[] = $value;

...Rodrigo's suggestion is NOT guaranteed to append the new element to the END of the array. For instance...

        $data['one'] = 1;
        $data['two'] = 2;
        $data['three'] = 3;
        $data['four'] = 4;

...might very well result in an array that looks like this...

       [ "four" => 4, "one" => 1, "three" => 3, "two" => 2 ]

I can only assume that PHP sorts the array as elements are added to make it easier for it to find a specified element by its key later. In many cases it won't matter if the array is not stored internally in the same order you added the elements, but if, for instance, you execute a foreach on the array later, the elements may not be processed in the order you need them to be.

If you want to add elements to the END of an associative array you should use the unary array union operator (+=) instead...

       $data['one'] = 1;
       $data += [ "two" => 2 ];
       $data += [ "three" => 3 ];
       $data += [ "four" => 4 ];

You can also, of course, append more than one element at once...

       $data['one'] = 1;
       $data += [ "two" => 2, "three" => 3 ];
       $data += [ "four" => 4 ];

Note that like array_push (but unlike $array[] =) the array must exist before the unary union, which means that if you are building an array in a loop you need to declare an empty array first...

       $data = [];
       for ( $i = 1; $i < 5; $i++ ) {
              $data += [ "element$i" => $i ];
       }

...which will result in an array that looks like this...

      [ "element1" => 1, "element2" => 2, "element3" => 3, "element4" => 4 ]
35
willdemaine at gmail dot com ¶
9 years ago
If you're adding multiple values to an array in a loop, it's faster to use array_push than repeated [] = statements that I see all the time:

<?php
class timer
{
        private $start;
        private $end;

        public function timer()
        {
                $this->start = microtime(true);
        }

        public function Finish()
        {
                $this->end = microtime(true);
        }

        private function GetStart()
        {
                if (isset($this->start))
                        return $this->start;
                else
                        return false;
        }

        private function GetEnd()
        {
                if (isset($this->end))
                        return $this->end;
                else
                        return false;
        }

        public function GetDiff()
        {
                return $this->GetEnd() - $this->GetStart();
        }

        public function Reset()
        {
                $this->start = microtime(true);
        }

}

echo "Adding 100k elements to array with []\n\n";
$ta = array();
$test = new Timer();
for ($i = 0; $i < 100000; $i++)
{
        $ta[] = $i;
}
$test->Finish();
echo $test->GetDiff();

echo "\n\nAdding 100k elements to array with array_push\n\n";
$test->Reset();
for ($i = 0; $i < 100000; $i++)
{
        array_push($ta,$i);
}
$test->Finish();
echo $test->GetDiff();

echo "\n\nAdding 100k elements to array with [] 10 per iteration\n\n";
$test->Reset();
for ($i = 0; $i < 10000; $i++)
{
        $ta[] = $i;
        $ta[] = $i;
        $ta[] = $i;
        $ta[] = $i;
        $ta[] = $i;
        $ta[] = $i;
        $ta[] = $i;
        $ta[] = $i;
        $ta[] = $i;
        $ta[] = $i;
}
$test->Finish();
echo $test->GetDiff();

echo "\n\nAdding 100k elements to array with array_push 10 per iteration\n\n";
$test->Reset();
for ($i = 0; $i < 10000; $i++)
{
        array_push($ta,$i,$i,$i,$i,$i,$i,$i,$i,$i,$i);
}
$test->Finish();
echo $test->GetDiff();
?>

Output

$ php5 arraypush.php
X-Powered-By: PHP/5.2.5
Content-type: text/html

Adding 100k elements to array with []

0.044686794281006

Adding 100k elements to array with array_push

0.072616100311279

Adding 100k elements to array with [] 10 per iteration

0.034690141677856

Adding 100k elements to array with array_push 10 per iteration

0.023932933807373
49
egingell at sisna dot com ¶
11 years ago
If you push an array onto the stack, PHP will add the whole array to the next element instead of adding the keys and values to the array. If this is not what you want, you're better off using array_merge() or traverse the array you're pushing on and add each element with $stack[$key] = $value.

<?php

$stack = array('a', 'b', 'c');
array_push($stack, array('d', 'e', 'f'));
print_r($stack);

?>
The above will output this:
Array (
  [0] => a
  [1] => b
  [2] => c
  [3] => Array (
     [0] => a
     [1] => b
     [2] => c
  )
)
2
kamprettos at yahoo dot com Teguh Iskanto ¶
12 years ago
Looking for a way to push data into an associative array and frustrated to know that array_push() can't do the job ? 

here's my Scenario : 
-------------------
I need to relate system command output into an associative array like these :

[sge@digital_db work]$ /usr/local/apache/htdocs/work/qhost.sh -h t1 -F | awk '{if(NR>4) print $1}' | sed  's/hl://g' 
arch=lx24-amd64
num_proc=2.000000
mem_total=3.808G
swap_total=3.907G
virtual_total=7.715G
load_avg=0.000000
load_short=0.000000
load_medium=0.000000
load_long=0.000000
mem_free=3.510G
swap_free=3.907G
virtual_free=7.417G
mem_used=305.242M
swap_used=0.000
virtual_used=305.242M
cpu=0.000000
np_load_avg=0.000000
np_load_short=0.000000
np_load_medium=0.000000
np_load_long=0.000000

how I did it :
<? php

# get into the system command output 
$assoc_cmd =`$work_dir/qhost.sh -h $host_resource -F | awk '{if(NR>4) print $1}'| sed  's/hl://g' ` ;

# split the "\n" character 
$assoc_row = explode("\n", chop($assoc_cmd));

# get the index row 
$idx_row  = count($assoc_row) - 1 ;

# initialize the associative array 
$host_res_array = array();

for ($i = 0 ; $i<= $idx_row ; $i++) 
        {       
                # get params & values 
                list($host_param,$host_val) = explode("=",$assoc_row[$i]);

                # populate / push data to assoc array 
                $host_res_array[$host_param]= $host_val ;
        }    

echo "<pre> Architecture : </pre>\n" ;
echo $host_res_array['arch'] ;
echo "<pre> Mem Total    : </pre>\n" ;
echo $host_res_array['mem_tot'];

?>

Hope this helps ! :)
4
aosojnik at gmail dot com ¶
8 years ago
If you want to preserve the keys in the array, use the following: 

<?php 
function array_pshift(&$array) { 
    $keys = array_keys($array); 
    $key = array_shift($keys); 
    $element = $array[$key]; 
    unset($array[$key]); 
    return $element; 
} 
?>
3
bk at quicknet dot nl ¶
12 years ago
Add elements to an array before or after a specific index or key:

<?php

/**
* @return array
* @param array $src
* @param array $in
* @param int|string $pos
*/
function array_push_before($src,$in,$pos){
    if(is_int($pos)) $R=array_merge(array_slice($src,0,$pos), $in, array_slice($src,$pos));
    else{
        foreach($src as $k=>$v){
            if($k==$pos)$R=array_merge($R,$in);
            $R[$k]=$v;
        }
    }return $R;
}

/**
* @return array
* @param array $src
* @param array $in
* @param int|string $pos
*/
function array_push_after($src,$in,$pos){
    if(is_int($pos)) $R=array_merge(array_slice($src,0,$pos+1), $in, array_slice($src,$pos+1));
    else{
        foreach($src as $k=>$v){
            $R[$k]=$v;
            if($k==$pos)$R=array_merge($R,$in);
        }
    }return $R;
}

// Examples:

$src=array("A","B","C");
$in=array("X","Y");

var_dump(array_push_before($src,$in,1));
/* array_push_before, no-key array
array(5) {
  [0]=>
  string(1) "A"
  [1]=>
  string(1) "X"
  [2]=>
  string(1) "Y"
  [3]=>
  string(1) "B"
  [4]=>
  string(1) "C"
}*/

var_dump(array_push_after($src,$in,1));
/* array_push_after, no-key array
array(5) {
  [0]=>
  string(1) "A"
  [1]=>
  string(1) "B"
  [2]=>
  string(1) "X"
  [3]=>
  string(1) "Y"
  [4]=>
  string(1) "C"
}*/

$src=array('a'=>"A",'b'=>"B",'c'=>"C");
$in=array('x'=>"X",'y'=>"Y");

var_dump(array_push_before($src,$in,1));
/* array_push_before, key array, before index insert
array(5) {
  ["a"]=>
  string(1) "A"
  ["x"]=>
  string(1) "X"
  ["y"]=>
  string(1) "Y"
  ["b"]=>
  string(1) "B"
  ["c"]=>
  string(1) "C"
}*/

var_dump(array_push_before($src,$in,'b'));
/* array_push_before, key array, before key insert
array(5) {
  ["a"]=>
  string(1) "A"
  ["x"]=>
  string(1) "X"
  ["y"]=>
  string(1) "Y"
  ["b"]=>
  string(1) "B"
  ["c"]=>
  string(1) "C"
}*/

var_dump(array_push_after($src,$in,1));
/* array_push_after, key array, after index insert
array(5) {
  ["a"]=>
  string(1) "A"
  ["b"]=>
  string(1) "B"
  ["x"]=>
  string(1) "X"
  ["y"]=>
  string(1) "Y"
  ["c"]=>
  string(1) "C"
}*/

var_dump(array_push_after($src,$in,'b'));
/* array_push_after, key array, after key insert
array(5) {
  ["a"]=>
  string(1) "A"
  ["b"]=>
  string(1) "B"
  ["x"]=>
  string(1) "X"
  ["y"]=>
  string(1) "Y"
  ["c"]=>
  string(1) "C"
}*/

?>
1
helpmepro1 at gmail dot com ¶
9 years ago
elegant php array combinations algorithm

<?

//by Shimon Dookin

function get_combinations(&$lists,&$result,$stack=array(),$pos=0)
{
$list=$lists[$pos];
if(is_array($list))
  foreach($list as $word)
  {
   array_push($stack,$word);
   if(count($lists)==count($stack))
    $result[]=$stack;
   else
    get_combinations($lists,$result,$stack,$pos+1);
   array_pop($stack);
  }
}

$wordlists= array( array("shimon","doodkin") , array("php programmer","sql programmer","mql metatrader programmer") );

get_combinations($wordlists,$combinations);

echo '<xmp>';
print_r($combinations);

?>
0
gfuente at garrahan dot gov dot ar ¶
11 months ago
If the element to be pushed onto the end of array is an array you will receive the following error message: 

Unknown Error, value: [8] Array to string conversion

I tried both: (and works, but with the warning message)

            $aRol = array( $row[0], $row[1], $row[2] );
            $aRoles[] = $aRol;

and 
            array_push( $aRoles, $aRol);

The correct way:

            $cUnRol = implode("(",array( $row[0], $row[1], $row[2] ) ); 
            array_push( $aRoles, $cUnRol ); 

thanks.
-1
colecooper2005 at icloud dot com ¶
1 year ago
When developing a pocketmine plugin, a good way to add stuff to a YAML table is

$table=$this->config->get("Table");
array_push($table, "New Value for table");
$this->config->set("Table", $table);
-1
raat1979 at gmail dot com ¶
1 year ago
Unfortunately array_push returns the new number of items in the array
It does not give you the key of the item you just added, in numeric arrays you could do -1, you do however need to be sure that no associative key exists as that would break the assumption

It would have been better if array_push would have returned the key of the item just added like the below function
(perhaps a native variant would be a good idea...)

<?php

if(!function_exists('array_add')){
    function array_add(array &$array,$value /*[, $...]*/){
        $values = func_get_args();     //get all values
        $values[0]= &$array;        //REFERENCE!
        $org=key($array);              //where are we?
        call_user_func_array('array_push',$values);
        end($array);                 // move to the last item
        $key = key($array);         //get the key of the last item
        if($org===null){
            //was at eof, added something, move to it
            return $key;
        }elseif($org<(count($array)/2)){ //somewhere in the middle +/- is fine
            reset($array);
            while (key($array) !== $org) next($List);
        }else{
            while (key($array) !== $org) prev($List);
        }
        return $key;
    }
}
echo "<pre>\n";
$pr = array('foo'=>'bar','bar'=>'foo');
echo "Taken array;"; 
print_r($pr);

echo "\npush 1 returns ".array_push($pr,1)."\n";
echo "------------------------------------\n";
$pr = array('foo'=>'bar','bar'=>'foo');
echo "\npush 2 returns ".array_push($pr,1,2)."\n";
echo "------------------------------------\n";
$pr = array('foo'=>'bar','bar'=>'foo');
echo "\n add 1 returns ".array_add($pr,2)."\n\n";
echo "------------------------------------\n";
$pr = array('foo'=>'bar','bar'=>'foo');
echo "\n add 2 returns ".array_add($pr,1,2)."\n\n";
echo "<pre/>\n\n";
?>
Outputs:
Taken array;Array
(
    [foo] => bar
    [bar] => foo
)

push 1 returns 3
------------------------------------

push 2 returns 4
------------------------------------

add 1 returns 0

------------------------------------

add 2 returns 1
0
golddragon007 ¶
2 years ago
I did a performance check, and I saw, if you push more than one value it can be faster the array push, that the normal $array[] version.

Case 1: $array[] = something;
Case 2: array_push($array, $value);
Case 3: array_push($array, $value1, $value2, $value3 [...]); $values are definied
Case 4: array_push($array, $value1, $value2, $value3 [...]); $values are definied, when $array is not empty
Case 5: Case1 + Case 3
Case 6: Result array contains some value (Case 4)
Case 7: Result array contains same value as the push array (Case 4)
-----------------------------------------------------------------------------------------------------------
~~~~~~~~~~~~ Case 1 ~~~~~~~~~~~~
Times: 0.0310 0.0300 0.0290 0.0340 0.0400 0.0440 0.0480 0.0550 0.0570 0.0570
Min: 0.0290
Max: 0.0570
Avg: 0.0425
~~~~~~~~~~~~ Case 2 ~~~~~~~~~~~~
Times: 0.3890 0.3850 0.3770 0.4110 0.4020 0.3980 0.4020 0.4060 0.4130 0.4200
Min: 0.3770
Max: 0.4200
Avg: 0.4003
~~~~~~~~~~~~ Case 3 ~~~~~~~~~~~~
Times: 0.0200 0.0220 0.0240 0.0340 0.0360 0.0410 0.0460 0.0500 0.0520 0.0520
Min: 0.0200
Max: 0.0520
Avg: 0.0377
~~~~~~~~~~~~ Case 4 ~~~~~~~~~~~~
Times: 0.0200 0.0250 0.0230 0.0260 0.0330 0.0390 0.0460 0.0510 0.0520 0.0520
Min: 0.0200
Max: 0.0520
Avg: 0.0367
~~~~~~~~~~~~ Case 5 ~~~~~~~~~~~~
Times: 0.0260 0.0250 0.0370 0.0360 0.0390 0.0440 0.0510 0.0520 0.0530 0.0560
Min: 0.0250
Max: 0.0560
Avg: 0.0419
~~~~~~~~~~~~ Case 6 ~~~~~~~~~~~~
Times: 0.0340 0.0280 0.0370 0.0410 0.0450 0.0480 0.0560 0.0580 0.0580 0.0570
Min: 0.0280
Max: 0.0580
Avg: 0.0462
~~~~~~~~~~~~ Case 7 ~~~~~~~~~~~~
Times: 0.0290 0.0270 0.0350 0.0410 0.0430 0.0470 0.0540 0.0540 0.0550 0.0550
Min: 0.0270
Max: 0.0550
Avg: 0.044

Tester code:
// Case 1
    $startTime = microtime(true);
    $array = array();
    for ($x = 1; $x <= 100000; $x++)
    {
        $array[] = $x;
    }
    $endTime = microtime(true);

// Case 2
    $startTime = microtime(true);
    $array = array();
    for ($x = 1; $x <= 100000; $x++)
    {
        array_push($array, $x);
    }
    $endTime = microtime(true);

// Case 3
    $result = array();
    $array2 = array(&$result)+$array;
    $startTime = microtime(true);
    call_user_func_array("array_push", $array2);
    $endTime = microtime(true);

// Case 4
    $result = array();
    for ($x = 1; $x <= 100000; $x++)
    {
        $result[] = $x;
    }
    $array2 = array(&$result)+$array;
    $startTime = microtime(true);
    call_user_func_array("array_push", $array2);
    $endTime = microtime(true);

// Case 5
    $result = array();
    $startTime = microtime(true);
    $array = array(&$result);
    for ($x = 1; $x <= 100000; $x++)
    {
        $array[] = $x;
    }
    $endTime = microtime(true);

// Case 6
    $result = array(1,2,3,4,5,6);
    $startTime = microtime(true);
    $array = array(&$result);
    for ($x = 1; $x <= 100000; $x++)
    {
        $array[] = $x;
    }
    $endTime = microtime(true);

// Case 7
    $result = array();
    for ($x = 1; $x <= 100000; $x++)
    {
        $result[] = $x;
    }
    $startTime = microtime(true);
    $array = array(&$result);
    for ($x = 1; $x <= 100000; $x++)
    {
        $array[] = $x;
    }
    $endTime = microtime(true);
0
flobee ¶
4 years ago
Be warned using $array "+=" array(1,2,3) or union operations (http://php.net/manual/en/language.operators.array.php)

I think it worked in the past or i havent test it good enough. :-/ 
(once it worked, once [] was faster than array_push, the past :-D ): 

php -r '$a = array(1,2); $a += array(3,4); print_r($a);'
Array (
    [0] => 1
    [1] => 2
)
php -r '$a = array(1,2); $b = array(3,4);$c = $a + $b; print_r($c);'
Array (
    [0] => 1
    [1] => 2
)
php -r '$a = array(1,2); $b = array(2=>3,3=>4);$c = $a + $b; print_r($c);'
Array (
    [0] => 1
    [1] => 2
    [2] => 3
    [3] => 4
)
0
Chicna ¶
5 years ago
I found a simple way to have an "array_push_array" function, without the references problem when we want to use call_user_func_array(), hope this help : 

function array_push_array(array &$array)
{
    $numArgs = func_num_args();
    if(2 > $numArgs)
    {
      trigger_error(sprintf('%s: expects at least 2 parameters, %s given', __FUNCTION__, $numArgs), E_USER_WARNING);
      return false;
    }
    
    $values = func_get_args();
    array_shift($values);
   
    foreach($values as $v)
    {
      if(is_array($v)) 
      {
        if(count($v) > 0) 
        {
          foreach($v as $w)
          {
            $array[] = $w;
          }
        }
      }
      else 
      {
        $array[] = $v;
      }
    }
    
    return count($array);
}
0
rarioj at gmail dot com ¶
8 years ago
This function "Returns the new number of elements in the array."

To find out the last index, use:

<?php
$count = array_push($array, $value);
$last_index = array_pop(array_keys($array));
?>
0
wesleys at opperschaap dot net ¶
9 years ago
A function which mimics push() from perl, perl lets you push an array to an array: push(@array, @array2, @array3). This function mimics that behaviour.

<?php

function array_push_array(&$arr) {
    $args = func_get_args();
    array_shift($args);

    if (!is_array($arr)) {
        trigger_error(sprintf("%s: Cannot perform push on something that isn't an array!", __FUNCTION__), E_USER_WARNING);
        return false;
    }

    foreach($args as $v) {
        if (is_array($v)) {
            if (count($v) > 0) {
                array_unshift($v, &$arr);
                call_user_func_array('array_push',  $v);
            }
        } else {
            $arr[] = $v;
        }
    }
    return count($arr);
}

$arr = array(0);
$arr2  = array(6,7,8);
printf("%s\n", array_push_array($arr, array(),array(1,2,3,4,5), $arr2));
print_r($arr);

# error.. 
$arr = "test";
printf("%s\n", array_push_array($arr, array(),array(1,2,3,4,5), $arr2));

?>
0
alexander dot williamson at gmail dot com ¶
9 years ago
This will work to solve the associative array issues:

$aValues[$key] = $value;

Where $key is a unique identifier and $value is the value to be stored. Since the $key works off a string or number, if you already have a $key with the same value as an existing $key, the element will be overwritten.

e.g.

$aValues["one"] = "value of one";
$aValues["two"] = "different value of two!";

gives:
array([one] => "value of one", [two] => "value of two");

but will be overwritten when using the same key (one):

$aValues["one"] = "value of one";
$aValues["one"] = "different value of two!";

will give:

array([one] => "different value of two!");

3686
0
zbde00 at hotmail dot com ¶
10 years ago
A very good function to remove a element from array 
function array_del($str,&$array)
{
    if (in_array($str,$array)==true) 
    {
    
        foreach ($array as $key=>$value)
        {
            if ($value==$str) unset($array[$key]);
        }
    }
}
0
Marc Bernet ¶
11 years ago
A small and basic implementation of a stack without using an array.

class node
{
        var $elem;
        var    $next;
}
class stack
{
    var $next;
    function pop()
    {
        $aux=$this->next->elem;
        $this->next=$this->next->next;
        return $aux;
    }
    function push($obj)
    {
        $nod=new node;
        $nod->elem=$obj;
        $nod->next=$this->next;
        $this->next=$nod;
    }
    function stack()
    {
        $this->next=NULL;
    }     
}
0
steve at webthoughts d\ot ca ¶
12 years ago
Further Modification on the array_push_associative function
1.  removes seemingly useless array_unshift function that generates php warning
2.  adds support for non-array arguments

<?
// Append associative array elements
function array_push_associative(&$arr) {
   $args = func_get_args();
   foreach ($args as $arg) {
       if (is_array($arg)) {
           foreach ($arg as $key => $value) {
               $arr[$key] = $value;
               $ret++;
           }
       }else{
           $arr[$arg] = "";
       }
   }
   return $ret;
}

$items = array("here" => "now");
$moreitems = array("this" => "that");

$theArray = array("where" => "do we go", "here" => "we are today");
echo array_push_associative($theArray, $items, $moreitems, "five") . ' is the size of $theArray.<br />';
    
echo "<pre>";
print_r($theArray);
echo "</pre>";

?>

Yields: 

4 is the size of $theArray.
Array
(
    [where] => do we go
    [here] => now
    [this] => that
    [five] => 
)
0
john ¶
12 years ago
A variation of kamprettos' associative array push:

// append associative array elements
function associative_push($arr, $tmp) {
  if (is_array($tmp)) {
    foreach ($tmp as $key => $value) { 
      $arr[$key] = $value;
    }
    return $arr;
  }
  return false;
}

$theArray = array();
$theArray = associative_push($theArray, $items);
0
ciprian dot amariei at gmail com ¶
12 years ago
regarding the speed of oneill's solution to insert a value into a non-associative array,  I've done some tests and I found that it behaves well if you have a small array and more insertions, but for a huge array and a little insersions I sugest  using this function:

function array_insert( &$array, $index, $value ) {
   $cnt = count($array);

   for( $i = $cnt-1; $i >= $index; --$i ) {
       $array[ $i + 1 ] = $array[ $i ];
   }
   $array[$index] = $value;
}

or if you are a speed adicted programmer (same situation: big array, few insertions) use this:

array_splice ( $array, $offset, 0, $item );

item may also be an array of values ;).
0
Phil Davies ¶
12 years ago
As someone pointed out the array_push() function returns the count of the array not the key of the new element. As it was the latter function i required i wrote this very simple replacement.

function array_push2(&$array,$object,$key=null){
    $keys = array_keys($array);
    rsort($keys);
    $newkey = ($key==null)?$keys[0]+1:$key;
    $array[$newkey] = $object;
    return $newkey;
}
0
bart at framers dot nl ¶
16 years ago
Array_push also works fine with multidimensional arrays. Just make sure the element is defined as an array first. 

<?php 
$array["element"][$element]["element"] = array(); 
array_push ($array["element"][$element]["element"], "banana"); 
?>
-3
yuri ¶
6 years ago
If you want to put an element to a specific position in an array, try this function.

<?php

function array_put_to_position(&$array, $object, $position, $name = null)
{
        $count = 0;
        $return = array();
        foreach ($array as $k => $v) 
        {   
                // insert new object
                if ($count == $position)
                {   
                        if (!$name) $name = $count;
                        $return[$name] = $object;
                        $inserted = true;
                }   
                // insert old object
                $return[$k] = $v; 
                $count++;
        }   
        if (!$name) $name = $count;
        if (!$inserted) $return[$name];
        $array = $return;
        return $array;
}
?>

Example :

<?php
$a = array(
'a' => 'A',
'b' => 'B',
'c' => 'C',
);
            
print_r($a);
array_put_to_position($a, 'G', 2, 'g');
print_r($a);

/*
Array
(
    [a] => A
    [b] => B
    [c] => C
)
Array
(
    [a] => A
    [b] => B
    [g] => G
    [c] => C
)
*/
?>
-3
oneill at c dot dk ¶
12 years ago
To insert a value into a non-associative array, I find this simple function does the trick:

function insert_in_array_pos($array, $pos, $value)
{
  $result = array_merge(array_slice($array, 0 , $pos), array($value), array_slice($array,  $pos));
  return $result;
}

Seems an awful lot simpler than the iterative solutions given above...


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5down votefavorite
3

I'm not sure what's going wrong here. I was just following a tutorial online and these errors popped up.

I'm getting the following errors

Error

Notice: Undefined variable: db in C:\xampp\htdocs\wisconsindairyfarmers\admin\login.php on line 7

Fatal error: Call to a member function query() on null in C:\xampp\htdocs\wisconsindairyfarmers\admin\login.php on line 7

Code

<?php
$db = new mysqli('127.0.0.1', 'root', '', 'wisconsindairyfarmers');
?>

<?php
require '../db/connect.php';
require '../functions/general.php';

    function user_exists($username){
        //$username = sanitize($username);
        $result = $db->query("SELECT COUNT(UserId) FROM users WHERE UserName = '$username'");
        if($result->num_rows){
        return (mysqli_result($query, 0) == 1) ? true : false;
    }}

if(empty($_POST) === false){

    $username = $_POST['username'];
    $password = $_POST['password'];

    if(empty($username) === true || empty($password) === true){ 
        echo 'You need to enter a username and password';
    }
    else if(user_exists($username) === false) {
        echo 'We can\'t find that username.';
    }
}

?>
   
shareimprove this question
3 
Your $db variable is inside a function and thus out of scope from the code that defines it. Declare it global, or better, pass it as an argument to your function. See the PHP manual on scope – user1864610 Jun 23 '15 at 2:22 
   
I changed the variables, and the first error is fixed, but I'm still getting : Fatal error: Call to undefined function mysqli_result() – MPStimpson Jun 23 '15 at 2:32
   
I think that is because you are using OOP on the first part and procedural for the the results. – Rasclatt Jun 23 '15 at 2:38
   
I'm kind of new to php, how do I go about fixing that? – MPStimpson Jun 23 '15 at 2:41
   
I think that's because mysqli_result() is not a function. I'm really not clear what that piece of code is trying to do, but mysqli_result() doesn't exist in PHP. – user1864610 Jun 23 '15 at 2:41
up vote10down voteaccepted

First, you declared $db outside the function. If you want to use it inside the function, you should put this at the begining of your function code:

global $db;

And I guess, when you wrote:

if($result->num_rows){
        return (mysqli_result($query, 0) == 1) ? true : false;

what you really wanted was:

if ($result->num_rows==1) { return true; } else { return false; }
shareimprove this answer
   
I'm not getting any errors anymore, but I can't seem to get into the 'user_exists($username) === false' when I'm testing do you have any other wisdom to share with me today :) – MPStimpson Jun 23 '15 at 4:08
   
Yes, your SQL query will always return 1 row, with 1 field saying the amount of users equals to username. Change that to "SELECT * FROM users WHERE UserName = '$username'" and it will work – Juan Carlos Alvez Balbastro Jun 24 '15 at 17:41
   
I figured that out, but thank you very much! You've been very helpful! That's what I get for blindly following tutorials – MPStimpson Jun 26 '15 at 1:06


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