PHP Handbuch
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# Why not to use Magic Quotes

- Portability

  Assuming it to be on, or off, affects portability. Use get_magic_quotes_gpc() to check for this, and code accordingly.

- Performance

  Because not every piece of escaped data is inserted into a database, there is a performance loss for escaping all this data. Simply calling on the escaping functions (like addslashes()) at runtime is more efficient.

  Although `php.ini-dist` enables these directives by default, `php.ini-recommended` disables it. This recommendation is mainly due to performance reasons.

- Inconvenience

  Because not all data needs escaping, it's often annoying to see escaped data where it shouldn't be. For example, emailing from a form, and seeing a bunch of \' within the email. To fix, this may require excessive use of stripslashes().

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