php - How to move array elements to top if compared with string? -

i have array $result getting mysql follows

    array (     [0] => array         (             [p_title] => apple new ipad (white, 64gb, wifi)         )     [1] => array         (             [p_title] => apple ipad mini/ipad mini retina belkin fastfit bluetooth wireless key         )     [2] => array         (             [p_title] => apple ipad air (16gb, wifi + cellular)         ) ) 

and suppose getting sort value in $sort_by variable. ex. currently,

$sort_by="apple ipad";

so want move each array elements have p_title "apple ipad" top.

so output array should be;

array (     [0] => array         (             [p_title] => apple ipad air (16gb, wifi + cellular)         )     [1] => array         (             [p_title] => apple ipad mini/ipad mini retina belkin fastfit bluetooth wireless key         )     [2] => array         (             [p_title] => apple new ipad (white, 64gb, wifi)         ) ) 

i ready edit code either in mysql query or in php.

use usort():

 function sortx($a, $b) {     if(strpos($a['p_title'],'apple ipad')!==false){         return -1;     }     return 1; }  usort($array, 'sortx'); 

whenever preceding value contain string, pushed towards beginning of array.

if want use variable in usort() function, need use objects:

class sorttitles{     public $string;     function sortx($a, $b) {         if(strpos($a['p_title'],$this->string)!==false){             return -1;         }         return 1;     }     public function sort_titles($array){         usort($array, 'self::sortx');         return $array;     }  } $sort = new sorttitles; $sort->string = 'apple ipad'; $array = $sort->sort_titles($array);