Description:
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I write and test PHP scripts on WinXP with Apache 1.3.x and pre-compiled PHP 4.3.2. Sites where I host my pages are Linux and OpenBSD running Apache 1.3.x and PHP 4.3.1. In both cases I use MySQL. Both PHP installations have the same configuration except for the file paths.

Program I wrote stores HTML pages in database so the text in SQL statement has to be escaped. Under WinXP I have to write code like this:

$string = "'".addslashes($string)."'";

Under Linux and OpenBSD installations when I run the same code I get the string escaped TWICE. I presume that the string is escaped again during concantenation.

Reproduce code:
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$string = '<IMG SRC="http://example.com/Arrow.gif">';
$string = "'".addslashes($string)."'";

// Under WinXP I get:
// <IMG SRC=\"http://example.com/Arrow.gif\">

// Under Linux & OpenBSD I get
// <IMG SRC=\\\"http://example.com/Arrow.gif\\\">