php测试性能代码

php测试性能代码function microtime_float (){ list ($usec, $sec) = explode(" ", microtime()); return ((float) $usec + (float) $sec);}function echotime ($name){ static $t_start = 0; $t_end = microtime_float(); if ($name != 'start') { $time = $t_end - $t_start; echo ($name . ':'); echo intval($time * 1000); echo "\n"; } $t_start = $t_end;}$index = 1000;$loop = 10000;$length = 10000;$key = "abc" . $index;$array = array();for ($i = 0; $i $array['abc' . $i] = 'abc' . $i;}echotime('start');for ($i = 0; $i if (array_key_exists($key, $array)) { $a = true; }}echotime('array_key_exists');for ($i = 0; $i if (isset($array[$key])) { $a = true; }}echotime('isset');for ($i = 0; $i if (in_array($key, $array)) { $a = true; }}echotime('in_array');for ($i = 0; $i if (array_search($key, $array)) { $a = true; }}echotime('array_search');$array2 = array_flip($array);for ($i = 0; $i if (isset($array2[$key])) { $a = true; }}echotime('flip and search');$array2 = $array;foreach ($array2 as $k => $v) { $array2[$k] = strtoupper($v);}echotime('foreach1');$array2 = $array;foreach ($array2 as &$v) { $v = strtoupper($v);}echotime('foreach2');$array2 = $array;$array2 = array_map('strtoupper', $array2);echotime('array_map');