PHP - Function usort()
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Syntax
usort ( $array, $cmp_function )
Definition and Usage
The usort() function sorts an array by a user defined comparison function. This function assigns new keys for the elements in the array. Existing keys will be removed.
Parameters
Sr.No | Parameter & Description |
---|---|
1 |
array(Required) It specifies an array. |
2 |
cmp_function(Required) Useful defined function to compare values and to sort them.
|
Return Value
Returns TRUE on success or FALSE on failure.
Example
Try out following example −
Live Demo<?php function cmp_function($a, $b) { if ($a == $b) return 0; return ($a > $b) ? -1 : 1; } $fruits = array("d"=>"lemon", "a"=>"orange", "b"=>"banana" ); usort($fruits, "cmp_function"); print_r($fruits); ?>
This will produce the following result −
Array ( [0] => orange [1] => lemon [2] => banana )
php_function_reference.htm
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