The usort() function sorts an array by values using a user-defined function
Syntax
usort(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 usort() 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;
}
$myarr = array(39, 23, 78, 55, 99, 120);
usort($myarr,"display");
for($i=0;$x<count($myarr);$i++) {
echo $myarr[$i];
echo "<br>";
}
?>Output
The following is the output −
23 39 55 78 99 120