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function array_diff($array_1, $array_2) {
                $diff = array();
            
                foreach ($array_1 as $k => $v1) {
                    $flag = false;
                    foreach ($array_2 as $v2) {
                        if ($flag = ($v1 == $v2)) {
                            break;
                        }
                    }
            
                    if (!$flag) {
                        $diff[$k] = $v1;
                    }
                }
            
                return $diff;
            }
  

function array_diff($array_1, $array_2) {
                foreach ($array_1 as $key => $item) {
                    if (in_array($item, $array_2, true)) {
                        unset($array_1[$key]);
                    }
                }
            
                return $array_1;
            }

  

function array_diff($array_1, $array_2) {
                $array_2 = array_flip($array_2);
                foreach ($array_1 as $key => $item) {
                    if (isset($array_2[$item])) {
                        unset($array_1[$key]);
                    }
                 }
            
                return $array_1;
            }
            

//isset 与 array_key_exitsts的比较
            
            for($i = 0 ;$i< 100000;$i++){
                $arr['a'.$i] = 'A'.$i;
            }
            
            $time = microtime(1);
            $a = isset($arr['a50000']);
            $t1 = microtime(1) - $time;
            
            $time = microtime(1);
            $a = array_key_exists('a50000',$arr);
            $t2 = microtime(1) - $time;
            
            echo $t1;
            echo "\n";
            echo $t2;
            
            
            exit;

//isset 与 array_key_exitsts的比较
            
            for($i = 0 ;$i< 100000;$i++){
                $arr['a'.$i] = 'A'.$i;
            }
            
            $time = microtime(1);
            $a = isset($arr['a50000000000']);
            $t1 = microtime(1) - $time;
            
            $time = microtime(1);
            $a = array_key_exists('a50000000000',$arr);
            $t2 = microtime(1) - $time;
            
            echo $t1;
            echo "\n";
            echo $t2;
            
            
            exit;