我的代码中的未知修饰符 [英] Unknown modifier in my code

问题描述

<? php
    $Src = 'images/pages/clients/logos/clnt_aljareera_img.jpg';
    $pttn= '/&Src:'.$Src.'/';
    $string=preg_replace($pttn,'',$string,1);
?>

//输出错误:

推荐答案

您的字符串包含一个完整的/混乱，当使用/作为正则表达式定界符时，需要将其作为\/进行转义.代替/作为正则表达式定界符，例如，使用在字符串中不会出现的内容，例如~.您必须选择一个定界字符，但是保证 not 不会出现在$Src中.即使使用|，也可能比使用~更安全.

Your string contains a whole mess of / which would need to be escaped as \/ when using / as the regex delimiter. Instead of / as the regex delimiters, use something which won't occur in your string like ~ for example. You must choose a delimiting character which is guaranteed not to appear in $Src, however. You might be safer even with | than with ~.

$Src = 'images/pages/clients/logos/clnt_aljareera_img.jpg';
// Delimit the regular expression with ~
$pttn= '~&Src:'.$Src.'~';
$string=preg_replace($pttn,'',$string,1);

发生的事情是，用/分隔的正则表达式在images/之后立即遇到p，因为它认为它已到达了结束定界符.下一个单词pages被错误地视为正则表达式修饰符的字符串.

What has happened is your regex delimited by / encounters a p immediately after images/ because it thinks it has reached the closing delimiter. The next word pages is mistakenly treated as a string of regex modifiers.

PHP看到正则表达式:

PHP sees the regular expression:

/&src:images/pages

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