wp-includes/ID3/module.audio.mp3.php:1805array public static function MPEGaudioModeExtensionArray() { static $MPEGaudioModeExtension; if (empty($MPEGaudioModeExtension)) { $MPEGaudioModeExtension = array ( 1 => array('4-31', '8-31', '12-31', '16-31'), 2 => array('4-31', '8-31', '12-31', '16-31'), 3 => array('', 'IS', 'MS', 'IS+MS') ); } return $MPEGaudioModeExtension; }Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-includes/ID3/module.audio.mp3.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.