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uasort

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(PHP 4, PHP 5, PHP 7)

uasort — Sort an array with a user-defined comparison function and maintain index association

Description

uasort ( array &$array , callable $value_compare_func ) : bool

This function sorts an array such that array indices maintain their correlation with the array elements they are associated with, using a user-defined comparison function.

This is used mainly when sorting associative arrays where the actual element order is significant.

Note:

If two members compare as equal, their relative order in the sorted array is undefined.

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Parameters

array

The input array.

value_compare_func

See usort() and uksort() for examples of user-defined comparison functions.

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Return Values

Returns TRUE on success or FALSE on failure.

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Examples

Example #1 Basic uasort() example

<?php
// Comparison function
function cmp($a, $b) {
    if ($a == $b) {
        return 0;
    }
    return ($a < $b) ? -1 : 1;
}

// Array to be sorted
$array = array('a' => 4, 'b' => 8, 'c' => -1, 'd' => -9, 'e' => 2, 'f' => 5, 'g' => 3, 'h' => -4);
print_r($array);

// Sort and print the resulting array
uasort($array, 'cmp');
print_r($array);
?>

The above example will output:

Array
(
    [a] => 4
    [b] => 8
    [c] => -1
    [d] => -9
    [e] => 2
    [f] => 5
    [g] => 3
    [h] => -4
)
Array
(
    [d] => -9
    [h] => -4
    [c] => -1
    [e] => 2
    [g] => 3
    [a] => 4
    [f] => 5
    [b] => 8
)

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See Also

Find a PHP function

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Document created the 30/01/2003, last modified the 26/10/2018
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References

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