尝试将正则表达式匹配传递给函数时出错 [英] Error trying to pass regex match to function

问题描述

我收到语法错误，意外的 T_LNUMBER，需要 T_VARIABLE 或 '$'

这是我正在使用的代码

function wpse44503_filter_content( $content ) {
    $regex = '#src=("|\')'.
        '(/images/(19|20)(0-9){2}/(0|1)(0-9)/[^.]+\.(jpg|png|gif|bmp|jpeg))'.
        '("|\')#';
    $replace = 'src="'.get_site_url( $2 ).'"';

    $output = preg_replace( $regex, $replace, $content );

    return $output;
}

这是我遇到错误的那一行 $replace = 'src="'.get_site_url( $2 ).'"';

This is the line where i'm getting that error $replace = 'src="'.get_site_url( $2 ).'"';

谁能帮我解决这个问题?谢谢

Can anyone help me to fix it? Thanks

推荐答案

使用 preg_replace，你需要使用 preg_replace_callback 改为获取调用的函数每场比赛.

What you're trying to do (ie replacing the matched string with the result of a function call) can't be done using preg_replace, you'll need to use preg_replace_callback instead to get a function called for every match.

preg_replace_callback 的简短示例；

A short example of preg_replace_callback;

$get_site_url =                    // Returns replacement
  function($row) { 
    return '!'.$row[1].'!';        // row[1] is first "backref"
  };                                                     

$str = 'olle';
$regex = '/(ll)/';                 // String to match

$output = preg_replace_callback(   // Match, calling get_site_url for replacement
    $regex,
    $get_site_url,
    $str);

var_dump($output);                 // output "o!ll!e"

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