uksort
Description
Sort an array by keys using a user-defined comparison function
Syntax
uksort ( array &$array , callable $key_compare_func ) : bool
Parameters
arrayThe input array.
key_compare_funcThe comparison function must return an integer less than, equal to, or greater than zero if the first argument is considered to be respectively less than, equal to, or greater than the second.
Return
Returns TRUE on success or FALSE on failure.
Examples
1
<?
function myfunction($a, $b)
{
$a = preg_replace('@^(a|an|the) @', '', $a);
$b = preg_replace('@^(a|an|the) @', '', $b);
return strcasecmp($a, $b);
}
$array = array("John" => 1, "the Earth" => 2, "an apple" => 3, "a banana" => 4);
$key_compare_func = "myfunction";
uksort($array, $key_compare_func);
foreach ($array as $key => $value) {
echo "$key: $value\n";
}
?>an apple: 3 a banana: 4 the Earth: 2 John: 1
