uasort
Description
Sort an array with a user-defined comparison function and maintain index association
Syntax
uasort ( array &$array , callable $value_compare_func ) : bool
Parameters
array
The input array.
value_compare_func
See usort() and uksort() for examples of user-defined comparison functions.
Return
Returns TRUE on success or FALSE on failure.
Examples
1
<? function myfunction($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 )