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WordPress has list of allowed Media Library upload extensions in wp-includes/functions.php but is there any way to return them to theme's files as an array?

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Are you using multisite? – bungeshea Dec 4 '12 at 11:03
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No. But an option to have both WP and WPMU solutions as an answer to this question would be great :) – Paul Dec 4 '12 at 11:10

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get_allowed_mime_types() function returns an array of mime types keyed by the file extension regex corresponding to those types.

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I believe you're looking for the wp_get_mime_types() function

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This function is introduced in WP3.5 and is not available in current stable release 3.4.x. – Parham Dec 4 '12 at 11:39
@Parham Thanks - I wasn't aware of this. Do you know if this function will be preferred over get_allowed_mime_types() when 3.5 is released? – bungeshea Dec 4 '12 at 11:43
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according to the source code, wp_get_mime_types() returns the list of ALL mime types and applies the 'mime_types' filter on the list. The filter should be used to add types, not remove them. get_allowed_mime_types() returns a list of allowed mime types, it uses wp_get_mime_types() to fetch the list but applies one more filter: 'upload_mimes' which can be used to remove types. – Parham Dec 4 '12 at 11:57

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