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I came across this code and was wondering what is FILE

function ch2fi_page_header_output() {
$icon_url = plugins_url( 'favicon.ico', __FILE__ );
?>

What does __FILE__ do in it? Thanks in advance.

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Please always search first on php.net. If you can't find it there, search on queryposts.com or in your source. Thanks. – kaiser Sep 17 '12 at 21:29

closed as off topic by toscho♦ Sep 17 '12 at 21:33

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1 Answer

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__FILE__ is a PHP Magic Constant and is not specific to WordPress.

The full path and filename of the file. If used inside an include, the name of the included file is returned. Since PHP 4.0.2, __FILE__ always contains an absolute path with symlinks resolved whereas in older versions it contained relative path under some circumstances.

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