The uasort() sorts an array with a user-defined function and maintain index association.
Syntax
uasort(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 uasort() 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;
}
$myarr = array("a"=>30,"b"=>12,"c"=>75);
uasort($myarr,"display");
foreach($myarr as $x=>$x_value) {
echo "Key=" . $x . " Value=" . $x_value;
echo "<br>";
}
?>Output
The following is the output −
Key=b Value=12 Key=a Value=30 Key=c Value=75