用preg_replace_callback替换已弃用的preg_replace/e [英] Replace deprecated preg_replace /e with preg_replace_callback

问题描述

$result = preg_replace(
    "/\{([<>])([a-zA-Z0-9_]*)(\?{0,1})([a-zA-Z0-9_]*)\}(.*)\{\\1\/\\2\}/iseU", 
    "CallFunction('\\1','\\2','\\3','\\4','\\5')",
    $result
);

上面的代码在升级到PHP 5.5后给出了弃用警告:

The above code gives a deprecation warning after upgrading to PHP 5.5:

已弃用:preg_replace():/e修饰符已弃用，请改用preg_replace_callback

Deprecated: preg_replace(): The /e modifier is deprecated, use preg_replace_callback instead

如何用preg_replace_callback()替换代码?

推荐答案

您可以使用匿名函数将匹配项传递给您的函数:

You can use an anonymous function to pass the matches to your function:

$result = preg_replace_callback(
    "/\{([<>])([a-zA-Z0-9_]*)(\?{0,1})([a-zA-Z0-9_]*)\}(.*)\{\\1\/\\2\}/isU",
    function($m) { return CallFunction($m[1], $m[2], $m[3], $m[4], $m[5]); },
    $result
);

除了速度更快之外，这还将正确处理字符串中的双引号.您当前使用/e的代码会将双引号"转换为\".

Apart from being faster, this will also properly handle double quotes in your string. Your current code using /e would convert a double quote " into \".

这篇关于用preg_replace_callback替换已弃用的preg_replace/e的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！