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


uasort

(PHP 4, PHP 5)

uasortSort an array with a user-defined comparison function and maintain index association

Description

bool uasort ( array &$array , callable $cmp_function )

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.

Parameters

array

The input array.

cmp_function

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

Return Values

Returns TRUE on success or FALSE on failure.

Examples

Example #1 Basic uasort() example

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