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/*
author: yangyu@sina.cn
description: ½»»»Êý×éÖÐÁ½¸öÔªËØµÄλÖã¬ÔªËذüÀ¨keyºÍvalue£¬¾ßÌåÓ÷¨¼ûÏÂÃæµÄÀý×Ó
*/
$arr = array(11=>'a',22=>'b',33=>'c',44=>'d');
$res = array_exchange($arr, 11 ,33);
//example:
echo '<pre>';print_r ($res);echo '</pre>';
function array_exchange($arr,$arg1,$arg2){
   $r = range(0,count($arr)-1);
   $res = $res_bak = array_combine($r,array_keys($arr));
   $change = array($arg1,$arg2);
   list($res[array_search($change[0],$res_bak)],$res[array_search($change[1],$res_bak)]) = array($change[1],$change[0]);
   foreach ($res as $v){
  $array[$v] = $arr[$v];
   }
   return $array;
}


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}
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