uasort
Description
Sort an array with a user-defined comparison function and maintain index association
Syntax
uasort ( array &$array , callable $value_compare_func ) : bool
Parameters
arrayThe input array.
value_compare_funcSee usort() and uksort() for examples of user-defined comparison functions.
Return
Returns TRUE on success or FALSE on failure.
Examples
1
<?
function myfunction($a, $b)
{
if ($a < $b) {
return -1;
} else if ($a > $b) {
return 1;
} else {
return 0;
}
}
$array = array('a' => 4, 'b' => 8, 'c' => -1, 'd' => -9, 'e' => 2, 'f' => 5, 'g' => 3, 'h' => -4);
$value_compare_func = "myfunction";
print_r($array);
uasort($array, $value_compare_func);
print_r($array);
?>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
)
