Add filter information to get_allowed_mime_types() inline docs

[lspcity]

In /wp-includes/functions.php there exists a function named get_allowed_mime_types().
In this function, all allowed mime types are hard-coded. There is no way to extend the list of mime types. So it's not possible to upload svg-files.

Please add SVG-files to this list:

'svg' => 'image/svg+xml',

[JustinSainton]

The list is filtered.

You can add the functionality with a very minimal plugin.

function js_add_mime_type( $mime_types ) {
	
	return array_merge( $mime_types, array( 'svg' => 'image/svg+xml' ) );

}

add_filter( 'upload_mimes', 'js_add_mime_type' );

[lspcity]

oh, didn't find that!
thank you.

[JustinSainton]

No worries - doc block should probably be updated to reflect the filter being used. Patch attached.

[nacin]

In [21180]:

Add note to get_allowed_mime_types() about the upload_mimes filter. props JustinSainton. fixes #20990.