Edit array placement - php

Question

I am having a simple issue with ordering an array elements.
Let's assume we have an array like this
[0]=>zero
[1]=>one
[2]=>two
[3]=>three
What i want is a way to move some elements to first position for example move one and two to first positions so i will have:
[1]=>one
[2]=>two
[0]=>zero
[3]=>three
and this should be done without knowing the current position of the element in the array which means it should be done by specifying the name of wanted element to move.
I thought about array_splice() but it won't work since i should specify the key of the element in array.

Answer 1

You could build two arrays (one with the searched values and one without) and merge them. Keep in mind that if you want to keep numeric keys, you should use the + operator instead of array_merge :
<?php
$array = array('zero', 'one', 'two', 'three');
$searched_values = array('one', 'two');
$array_first = $array_second = array();
foreach ($array as $key=>$value) {
if (in_array($value, $searched_values))
$array_first[$key] = $value;
else
$array_second[$key] = $value;
}
$array_end = $array_first + $array_second;
echo '<pre>'; print_r($array_end); echo '</pre>';
Returns :
Array
(
[1] => one
[2] => two
[0] => zero
[3] => three
)
EDIT : Keeping the $searched_values order
In this case, you just need to loop over the serached values in order to build an array of found values and simultaneously delete the initial array's entry :
<?php
$array = array('zero', 'one', 'two', 'three');
$searched_values = array('one', 'three', 'two');
$array_found = array();
foreach ($searched_values as $key=>$value) {
$found_key = array_search($value, $array);
if ($found_key !== false) {
$array_found[$found_key] = $value;
unset($array[$found_key]);
}
}
$array_end = $array_found + $array;
echo '<pre>'; print_r($array_end); echo '</pre>';
?>
Returns :
Array
(
[1] => one
[3] => three
[2] => two
[0] => zero
)

Answer 2

The only way I can think to do this is to remove it then add it:
$key = array_search('one', $array); // $key = 1;
$v = $my_array[$key];
unset($my_array[$key]);
array_unshift($my_array, $v);
Output:
[0] => one
[1] => zero
[2] => two
[3] => three
UPDATE:
If you use array_unshift it will not override your current element.