PHP kézikönyv
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# 31. Fejezet. Magic Quotes

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.

# What are Magic Quotes

When on, all ' (single-quote), " (double quote), \ (backslash) and NULL characters are escaped with a backslash automatically. This is identical to what addslashes() does.

There are three magic quote directives:

- magic_quotes_gpc

  Affects HTTP Request data (GET, POST, and COOKIE). Cannot be set at runtime, and defaults to on in PHP.

  See also get_magic_quotes_gpc().

- magic_quotes_runtime

  If enabled, most functions that return data from an external source, including databases and text files, will have quotes escaped with a backslash. Can be set at runtime, and defaults to off in PHP.

  See also set_magic_quotes_runtime() and get_magic_quotes_runtime().

- magic_quotes_sybase

  If enabled, a single-quote is escaped with a single-quote instead of a backslash. If on, it completely overrides magic_quotes_gpc. Having both directives enabled means only single quotes are escaped as ''. Double quotes, backslashes and NULL's will remain untouched and unescaped.

  See also ini_get() for retrieving its value.

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