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Array function library: Usort

Source: Internet
Author: User
Keywords PHP Chinese function Manual Usort array function library
Tags aliyun array array function library function function library function will be functions html
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Usort

(PHP3 >= 3.0.3, PHP4)

Usort---&http://www.aliyun.com/zixun/aggregation/37954.html ">nbsp; Sort the values of an array by user-defined functions

Syntax: void Usort (array array, function cmp_function);

Description:

This function will reorder the values of the array according to the function defined by the user.

Example:

<?php

function cmp ($a, $b) {

if ($a = = $b) return 0;

return ($a > $b) -1:1;
}

$a = array (3,2,5,6,1);

Usort ($a, CMP);

while (the list ($key, $value) = each ($a)) {
echo "$key: $value \ n";

}

?>

The results of this example will produce:

0:6 1:5 2:3 3:2 4:1

Reference: Uasort () Uksort () sort () Asort () Arsort () Ksort () Rsort ()

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