how to sort array according to index of key in php -

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this array:

$arr = array("pic0", "pic1", "pic2", "pic3", "pic4");

how can following strings:

$str1 = "pic1,pic2,pic3,pic4,pic0"; $str2 = "pic0,pic2,pic3,pic4,pic1"; $str3 = "pic0,pic1,pic3,pic4,pic2"; $str4 = "pic0,pic1,pic2,pic4,pic3"; $str5 = "pic0,pic1,pic2,pic3,pic4";

i'd use array, not 5 strings:

$arr = array ("pic0", "pic1", "pic2", "pic3", "pic4"); $final = array ();  for($i=1, $c = count($arr); $i <= $c; ++$i) // loop n times {     $tmp = $arr; // tmp array     $x = $arr[$i-1]; // element put in end     unset($tmp[$i-1]); // unset tmp array     $final[$i] = implode(",", $tmp) . "," . $x; // concatenate array $x in end }  print_r($final);  /* array (     [1] => pic1,pic2,pic3,pic4,pic0     [2] => pic0,pic2,pic3,pic4,pic1     [3] => pic0,pic1,pic3,pic4,pic2     [4] => pic0,pic1,pic2,pic4,pic3     [5] => pic0,pic1,pic2,pic3,pic4 ) */

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