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Disable m4a and m4b type in wordpress upload
* Modify mime types
* @param array $mime_types Mime types
public function modify_mime_type($mime_types){
// Unset m4a type
unset( $mime_types['mp3|m4a|m4b'] );
// Added mp3 type
$mime_types['mp3'] = 'audio/mp3';
return $mime_types;
add_filter( 'upload_mimes', 'modify_mime_type' );
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