奇怪的preg_quote行为 [英] strange preg_quote behavior

问题描述

我有这个代码

<?php
$a = "\\u0000";
$b =  preg_quote($a);
echo "<br />my own: ".$a;
echo "<br />with preg_quote:". $b;
?>

结果在这里

如何可能一个 \ 字符消失从我的 $ a 变量？

How is possible that one \ character vanished from my $a variable?

我认为这是非常开始的行为/问题，但我真的很失落转义字符

I think it's very begginer behavior/question but I'm really lost about these escape characters.

免责声明：我不是PHP中的开始

Disclaimer: I'm not begginer in PHP

推荐答案

p>因为 \ 转义下一个，因为每个 \ 需要转义。

because \ escapes the next one, as every \ needs to be escaped.

与单个\它转义下一个字符巫婆是你，但\u不是一个char代码，所以它显示为一个简单的字符

with a single \ it escapes the next character witch is u, but \u isn't a char code so it is displayed like a simple character

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