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Bug #12140 pcre_replace change behavior with \
Submitted: 2001-07-13 08:51 UTC Modified: 2001-08-06 12:58 UTC
From: madmax at express dot ru Assigned:
Status: Closed Package: PCRE related
PHP Version: 4.0.6 OS:
Private report: No CVE-ID: None
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 [2001-07-13 08:51 UTC] madmax at express dot ru 
task: 
need replace \ (one) to \\\\ (four)

On php.4.0.5 work:
$val1=preg_replace('/\\\/',"\\\\\\\\",$val);

On php 4.0.6 work:
$val1=preg_replace('/\\\/',"\\\\\\\\\\\\\\\\",$val);

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 [2001-08-06 12:58 UTC] andrei@php.net 
That's right. Your  \\\\\\\\ turns into \\\\ by the time PHP string parsing is done with it. Then the extension looks at it and sees two escaped backslashes so that's what you get - two backslashes.

In general, use str_replace() for things like that.
 
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