php - update this quicksort algorithm to handle sorting on a specific key -

i believe if dealing jumbled sets of data, quicksort 1 of best ways of handling sorting. update following code handle arrays keys can sort list of arrays opposed values in single array.

function quicksort($array) {     if (count($array) == 0)             return array();          $pivot = $array[0];         $left = $right = array();          ($i = 1; $i < count($array); $i++) {             if ($array[$i] < $pivot)                 $left[] = $array[$i];             else                 $right[] = $array[$i];         }         return array_merge(self::quicksort($left, ''), array($pivot), self::quicksort($right, '')); } 

using usort() anonymous function

<?php $arr = array(     array("val" => 10, "something" => "zzz", "val2" => 1110),     array("val" => 111, "something" => "aaa", "val2" => 1),     array("val" => 1, "something" => "bbb", "val2" => 12),     array("val" => 14, "something" => "eee", "val2" => 31),     array("val" => 2, "something" => "ccc", "val2" => 11), );  usort($arr, function ($a, $b) {     if ($a['val2'] > $b['val2']) {         $result = 1;     } elseif ($a['val2'] < $b['val2']) {         $result = -1;     } else {         $result = 0;     }     return $result; });  var_dump($arr); 

try thinking sort strategy design pattern

<?php class sortstrategy {     public $key;      public function __construct($key)     {         $this->key = $key;     }      public function cmp($a, $b)     {         return ($a[$this->key] > $b[$this->key]) ? 1 : (($a[$this->key] < $b[$this->key]) ? -1 : 0);     } }  $arr = array(     array("val" => 10, "something" => "zzz", "val2" => 1110),     array("val" => 111, "something" => "aaa", "val2" => 1),     array("val" => 1, "something" => "bbb", "val2" => 12),     array("val" => 14, "something" => "eee", "val2" => 31),     array("val" => 2, "something" => "ccc", "val2" => 11), );  // sort val2 key $objsortstrategy = new sortstrategy('val2'); usort($arr, [$objsortstrategy, 'cmp']); var_dump($arr);  // sort val key $objsortstrategy->key = 'val'; usort($arr, [$objsortstrategy, 'cmp']); var_dump($arr);  // sort key $objsortstrategy->key = 'something'; usort($arr, [$objsortstrategy, 'cmp']); var_dump($arr); 

note: quick example give ideas