array_push

(PHP 4, PHP 5, PHP 7, PHP 8)

array_pushPush one or more elements onto the end of array

Description

array_push(array &$array, mixed ...$values): int

array_push() treats array as a stack, and pushes the passed variables onto the end of array. The length of array increases by the number of variables pushed. Has the same effect as:

<?php
$array
[] = $var;
?>
repeated for each passed value.

Note: If you use array_push() to add one element to the array, it's better to use $array[] = because in that way there is no overhead of calling a function.

Note: array_push() will raise a warning if the first argument is not an array. This differed from the $var[] behaviour where a new array was created, prior to PHP 7.1.0.

Parameters

array

The input array.

values

The values to push onto the end of the array.

Return Values

Returns the new number of elements in the array.

Changelog

Version Description
7.3.0 This function can now be called with only one parameter. Formerly, at least two parameters have been required.

Examples

Example #1 array_push() example

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

The above example will output:

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

See Also

add a note

User Contributed Notes 35 notes

up
1236
Rodrigo de Aquino
12 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.
up
707
bxi at apparoat dot nl
16 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.
up
134
mrgreen dot webpost at gmail dot com
8 years 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 ]
up
49
willdemaine at gmail dot com
16 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
up
22
yhusky at qq dot com
6 years ago
There is a mistake in the note by egingell at sisna dot com 12 years ago. The tow dimensional array will output "d,e,f", not "a,b,c".

<?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] => d
[1] => e
[2] => f
)
)
up
6
raat1979 at gmail dot com
8 years 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
up
53
egingell at sisna dot com
18 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
)
)
up
16
Carlos Alberto B. Carucce
5 years ago
This is how I add all the elements from one array to another:

<?php
$oneArray
= ['d', 'e', 'f'];
$anotherArray = ['a', 'b', 'c'];

array_push($anotherArray, ...$oneArray);
//['a', 'b', 'c', 'd', 'e', 'f'];
up
3
P.A.Semi
5 years ago
There is problem with pushing references to array, introduced in PHP 5.4 - did someone decide it is not needed?

In PHP 5.3 this could be used:

$A=array(); array_push($A,1); $c=2; array_push($A,&$c); print_r($A); $c=3; print_r($A);

Outputs correctly:

Array ( [0] => 1 [1] => 2 )
Array ( [0] => 1 [1] => 3 )

Think of Reference as a pointer in other languages...
This function is needed for example to push parameters for MySql query:

$params=array(); array_push($params,&$field1); array_push($params,&$field2); array_unshift($params,'ss');
call_user_func_array(array($Query,'bind_param'),$params);

This code causes fatal error in PHP 5.4 and depending on server configuration it may not even be reported why...

A workarround to allow pushing references to array is this:

$A=array(); $A[]=1; $c=2; $A[]=&$c; print_r($A); $c=3; print_r($A);

$params=array(); $params[]=&$field1; $params[]=&$field2; array_unshift($params,'ss');
call_user_func_array(array($Query,'bind_param'),$params);

(in actual code, the fields are specified dynamically and iterated in for-loop...)

This seems working both on PHP 5.3 and PHP 5.6 ...
up
9
aosojnik at gmail dot com
14 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;
}
?>
up
6
helpmepro1 at gmail dot com
15 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);

?>
up
1
colecooper2005 at icloud dot com
7 years 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);
up
5
aaron dot hawley at uvm dot edu
19 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.
up
3
andrew at cgipro dot com
19 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
up
1
gfuente at garrahan dot gov dot ar
7 years 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.
up
2
steve at webthoughts d\ot ca
18 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] =>
)
up
1
flobee
10 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
)
up
0
David Spector
3 years ago
After using array_push you may wish to read the top (last) array element one or more times before using array_pop. To read the top array element efficiently, use the 'current' function.
up
0
siqueiramoises14 at gmail dot com
5 years ago
if you need to push a multidimensional numeric array into another, array push will push the hole array into a key of the first array, for example, let's imagine you have two arrays:

<?php
$array1
= [
0 => [
"key1" => "value1",
"key2" => "value2"
]
];

$array2 = [
0 => [
"key1" => "value1",
"key2" => "value2"
]
];

$array1[] = $array2;

//after that array1 will look like this:

[
0 => [
"key1" => "value1",
"key2" => "value2"
],

1 => [
0 => [
"key1" => "value2",
"key2" => "value2"
]
]

// If you don't want that to happen here's a function to avoid that:

function array_push_indexes($array1, $array2){
$lastKey = array_key_last($array1);
for(
$i = 0; $i < count($array2); $i++){
$KeyPosition = 1 + $i;
$array1[$lastKey+$KeyPosition] = $array2[$i];
}
return
$array1;
}

//Using the same example from before this function will return:

[
0 => [
"key1" => "value1",
"key2" => "value2"
],

1 => [
"key1" => "value1",
"key2" => "value2"
]
]

?>

P.S: the array_key_last function it's for PHP >= 7.3.0 see more here https://www.php.net/manual/en/function.array-key-last.php
up
1
wesleys at opperschaap dot net
15 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));

?>
up
2
bk at quicknet dot nl
19 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"
}*/

?>
up
0
golddragon007
9 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);
up
1
Marc Bernet
18 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;
}
}
up
1
oneill at c dot dk
19 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...
up
0
yuri
12 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
)
*/
?>
up
0
alexander dot williamson at gmail dot com
16 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
up
0
zbde00 at hotmail dot com
17 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]);
}
}
}
up
-1
Chicna
12 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);
}
up
-1
kamprettos at yahoo dot com Teguh Iskanto
19 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 ! :)
up
-1
john
18 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);
up
-1
Phil Davies
19 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;
}
up
-3
rarioj at gmail dot com
15 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));
?>
up
-2
David Spector
3 years ago
A common operation when pushing a value onto a stack is to address the value at the top of the stack.

This can be done easily using the 'end' function:

<?php
$top
=end($stack);
?>

Note: See the 'end' function for details about its side effect on the seldom used internal array pointer.
up
-4
asma dot gi dot 14 at gmail dot com
2 years ago
only variables could be passed by reference:
$arr = [1,2,3];
array_push(['a','b'],$arr) ; // error
array_push($arr,[1,2,3]) ; // correct
up
-3
ciprian dot amariei at gmail com
19 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 ;).
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