Why does php insert backslash while replacing double quotes

Question

I\'m wondering why php adds a backslash when i remove double quotes.

Answer 1

See http://php.net/manual/en/security.magicquotes.php

Magic Quotes is a process that automagically escapes incoming data to the PHP script. It's preferred to code with magic quotes off and to instead escape the data at runtime, as needed.

When on, all ' (single-quote), " (double quote), \ (backslash) and NULL characters are escaped with a backslash automatically.

In short, magic quotes is a feature in PHP where quote characters are automatically escaped with the \ character.

Here are some solutions for turning off magic quotes: http://www.php.net/manual/en/security.magicquotes.disabling.php