PHP comes with a number of built-in functions that are used to sort arrays in an easier way. Here, we are going to discuss a new function usort(). The usort() function in PHP sorts a given array by using a user-defined comparison function. This function is useful in case if we want to sort the array in a new manner. This function assigns new integral keys starting from zero to the elements present in the array and the old keys are lost.
Syntax:
boolean usort( $array, "function_name");
Parameters: This function accepts two parameters as shown in the above syntax and are described below:
-
$array: This parameter specifies the array which u want to sort.
-
function_name : This parameter specifies the name of a user-defined function which compares the values and sort the array specified by the parameter $array. This function returns an integer value based on the following conditions. If two arguments are equal, then it returns 0, If first argument is greater than second, it returns 1 and if first argument is smaller than second, it returns -1.
Return Value: This function returns the boolean type of value. It returns TRUE in case of success and FALSE in case of failure.
Below program illustrate the usort() function in PHP:
<?php
function comparatorFunc( $x , $y )
{
if ( $x == $y )
return 0;
if ( $x < $y )
return -1;
else
return 1;
}
$arr = array (2, 9, 1, 3, 5);
usort( $arr , "comparatorFunc" );
print_r( $arr );
?>
|
Output:
Array
(
[0] => 1
[1] => 2
[2] => 3
[3] => 5
[4] => 9
)
Reference:
http://php.net/manual/en/function.usort.php
Last Updated :
20 Jun, 2023
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