preg_replace 导致美元符号被删除 [英] preg_replace causing dollar signs get removed

问题描述

我有一个电子邮件系统，用户可以在其中写一条消息，然后发送消息.我刚刚发现的主要问题，考虑这段代码

I have an email system, where user write a message and it will send the message. The main problem which I just found, consider this code

    $findEmail = $this->Data->field('body', array('id' => 1610));

    //$getUserEmailTemplate will take frm dbase and e.g: 
    //Hi, @@MESSAGE@@. From: StackOverflow
    //It should change @@MESSAGE@@ part to data from $findEmail (in this example is the $74.97 ...)

    $getUserEmailTemplate = $findUser['User']['email_template'];
    $emailMessage = preg_replace('/B@@MESSAGE@@B/u', $findEmail, $getUserEmailTemplate);

    debug($findEmail);
    debug($emailMessage);

并为 $findemail 结果的电子邮件考虑此输入:

and consider this input for the email for $findemail result:

$74.97
$735.00s

$email 消息将导致:

$email Message will result in:

.97
5.00s

我该如何解决这个问题?我觉得我的 preg_replace 模式有问题.

How can I fix this? I feel like there's problem with my preg_replace pattern.

用户模板可以是任何东西，只要有@@MESSAGE@@，那部分就变成了用户消息输入.

User template can be anything, as long as there is @@MESSAGE@@ which, that part will be changed to the user message input.

谢谢

推荐答案

预解析替换文本以在后跟数字时转义 $(记住 $n> 在替换文本中使用时具有特殊含义).请参阅 php.net 文档页面上的评论:

Pre-parse the replacement text to escape the $ when followed by a number (remember that $n has special meaning when using in the replacement text). See the comment on the php.net docs page:

如果您的替换文本有可能包含任何字符串，例如$0.95"，你需要避开那些 $n 反向引用:

If there's a chance your replacement text contains any strings such as "$0.95", you'll need to escape those $n backreferences:

<?php
  function escape_backreference($x){
    return preg_replace('/$(d)/', '\$$1', $x);
  }
?>

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