PHP - add item to beginning of associative array

Php

Php Problem Overview

How can I add an item to the beginning of an associative array? For example, say I have an array like this:

$arr = array('key1' => 'value1', 'key2' => 'value2');

When I add something to it as in $arr['key0'] = 'value0';, I get:

Array
(
[key1] => value1
[key2] => value2
[key0] => value0
)

How do I make that to be

Array
(
[key0] => value0
[key1] => value1
[key2] => value2
)

Thanks,
Tee

Php Solutions

Solution 1 - Php

You could use the union operator:

$arr1 = array('key0' => 'value0') + $arr1;

or array_merge.

Solution 2 - Php

One way is with array_merge:

<?php
$arr = array('key1' => 'value1', 'key2' => 'value2');
$arr = array_merge(array('key0' => 'value0'), $arr);

Depending on circumstances, you may also make use of ksort.

Solution 3 - Php

$array = array('key1' => 'value1', 'key2' => 'value2');
array_combine(array_unshift(array_keys($array),'key0'),array_unshift(array_values($array),'value0'))

Solution 4 - Php

function unshift( array & $array, $key, $val)
{
	$array = array_reverse($array, 1);
	$array[$key] = $val;
	$array = array_reverse($array, 1);

	return $array;
}

Solution 5 - Php

If you don't want to merge the arrays you could just use ksort() on the array before iterating over it.

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Content TypeOriginal AuthorOriginal Content on Stackoverflow
QuestionteepusinkView Question on Stackoverflow
Solution 1 - PhpFelix KlingView Answer on Stackoverflow
Solution 2 - PhpoutisView Answer on Stackoverflow
Solution 3 - PhpMark BakerView Answer on Stackoverflow
Solution 4 - PhpTomekView Answer on Stackoverflow
Solution 5 - PhpJames CView Answer on Stackoverflow