The uksort() function sorts an array by keys using a user-defined function. It returns TRUE on success and FALSE on failure.
Syntax
uksort(arr, custom_function)
Parameters
arr − The specified array.
custom_function − The comparison function. It 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
The uksort() function returns TRUE on success and FALSE on failure.
Example
The following is an example −
<?php
function display($x,$y) {
if ($x==$y) return 0;
return ($x<$y)?-1:1;
}
$myarr = array("a"=>99,"b"=>27,"c"=>56);
uksort($myarr,"display");
foreach($myarr as $x=>$x_value) {
echo "Key=" . $x . " Value=" . $x_value;
echo "<br>";
}
?>Output
Key=a Value=99 Key=b Value=27 Key=c Value=56