filter_var 的表现

Question

我读到filter_var 内部没有使用正则表达式。这是否意味着它比preg_match 快很多？

我想在考虑速度性能的情况下检查电子邮件验证。

编辑

这不是重复的：我不是在问区别（至于 filter_var 和 preg_match 的优点是什么），而是执行起来更快（有或没有缓存）。此外，在 cmets 中，它表明 filter_var 使用正则表达式，就像 preg_match 一样，并且在相关问题中完全忽略了此信息。

Answer 1

从快速基准测试来看，filter_var() 函数似乎略快：

$times = 10000;

$result = array();

// preg_match version
// regex from https://github.com/php/php-src/blob/master/ext/filter/logical_filters.c#L525
$regexp = "/^(?!(?:(?:\\x22?\\x5C[\\x00-\\x7E]\\x22?)|(?:\\x22?[^\\x5C\\x22]\\x22?)){255,})(?!(?:(?:\\x22?\\x5C[\\x00-\\x7E]\\x22?)|(?:\\x22?[^\\x5C\\x22]\\x22?)){65,}@)(?:(?:[\\x21\\x23-\\x27\\x2A\\x2B\\x2D\\x2F-\\x39\\x3D\\x3F\\x5E-\\x7E]+)|(?:\\x22(?:[\\x01-\\x08\\x0B\\x0C\\x0E-\\x1F\\x21\\x23-\\x5B\\x5D-\\x7F]|(?:\\x5C[\\x00-\\x7F]))*\\x22))(?:\\.(?:(?:[\\x21\\x23-\\x27\\x2A\\x2B\\x2D\\x2F-\\x39\\x3D\\x3F\\x5E-\\x7E]+)|(?:\\x22(?:[\\x01-\\x08\\x0B\\x0C\\x0E-\\x1F\\x21\\x23-\\x5B\\x5D-\\x7F]|(?:\\x5C[\\x00-\\x7F]))*\\x22)))*@(?:(?:(?!.*[^.]{64,})(?:(?:(?:xn--)?[a-z0-9]+(?:-+[a-z0-9]+)*\\.){1,126}){1,}(?:(?:[a-z][a-z0-9]*)|(?:(?:xn--)[a-z0-9]+))(?:-+[a-z0-9]+)*)|(?:\\[(?:(?:IPv6:(?:(?:[a-f0-9]{1,4}(?::[a-f0-9]{1,4}){7})|(?:(?!(?:.*[a-f0-9][:\\]]){7,})(?:[a-f0-9]{1,4}(?::[a-f0-9]{1,4}){0,5})?::(?:[a-f0-9]{1,4}(?::[a-f0-9]{1,4}){0,5})?)))|(?:(?:IPv6:(?:(?:[a-f0-9]{1,4}(?::[a-f0-9]{1,4}){5}:)|(?:(?!(?:.*[a-f0-9]:){5,})(?:[a-f0-9]{1,4}(?::[a-f0-9]{1,4}){0,3})?::(?:[a-f0-9]{1,4}(?::[a-f0-9]{1,4}){0,3}:)?)))?(?:(?:25[0-5])|(?:2[0-4][0-9])|(?:1[0-9]{2})|(?:[1-9]?[0-9]))(?:\\.(?:(?:25[0-5])|(?:2[0-4][0-9])|(?:1[0-9]{2})|(?:[1-9]?[0-9]))){3}))\\]))$/iD";

$email = 'foo@bar.com';

$start_m = microtime();
$start = time();
for ($i=0; $i < $times; $i++){
      preg_match($regexp, $email);
}   

$end_m = microtime();
$end = time();
$bench = ($end - $start) + ($end_m - $start_m);
$result["preg_match"] = $bench;


// filter_var version
$start_m = microtime();
$start = time();
for ($i=0; $i < $times; $i++){
      filter_var($email, FILTER_VALIDATE_EMAIL);
}

$end_m = microtime();
$end = time();
$bench = ($end - $start) + ($end_m - $start_m);
$result["filter_var"] = $bench;

print_r(
    array(
      "times" => $times,
      "results" => $result
    )
);

_{（this gist的代码稍作修改版）}

我的系统上的结果：

PHP 5.5.9-1+sury.org~saucy+1 (cli) (built: Feb 13 2014 16:01:20) 
Copyright (c) 1997-2014 The PHP Group
Zend Engine v2.5.0, Copyright (c) 1998-2014 Zend Technologies
    with Zend OPcache v7.0.3, Copyright (c) 1999-2014, by Zend Technologies

Array
(
    [times] => 10000
    [results] => Array
        (
            [preg_match] => 0.16649
            [filter_var] => 0.110912
        )

)