php 求數組差集的自訂函數(效率優於array_diff函數)

本文介紹下，一個自訂的求數組差集的函數array_different，效率要好於array_diff函數。有需要的朋友參考下。 php求數組差集，代碼如下： $val) {if (isset($array_2[$val])) {unset($array_1[$key]);}}return $array_1;}function runtime($mode = 0) {static $t;if (!$mode) {$t = microtime();return;}$t1 = microtime();list($m0, $s0) = explode(" ", $t);list($m1, $s1) = explode(" ", $t1);return sprintf("%.3f", ($s1 + $m1 - $s0 - $m0) * 1000);}$array_1 = array();$array_2 = array();for ($i = 0; $i <= 5000; $i++) {$array_1[$i] = mt_rand(0, 100);$array_2[$i] = mt_rand(0, 100);}runtime(); //計時開始$arr_diff = array_diff($array_1, $array_2);echo runtime(1); //計時結束並輸出計時結果echo ' ';foreach ($arr_diff as $key => $val) {echo $val.',';}runtime(); //計時開始$arr_diff2 = array_different($array_1, $array_2);echo runtime(2); //計時結束並且輸出計時結果foreach ($arr_diff2 as $key => $val) {echo $val.',';}?>

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