wp-includes/ID3/module.audio.mp3.php:2129$SourceSampleFrequencyIDintstring public static function LAMEmiscSourceSampleFrequencyLookup($SourceSampleFrequencyID) { static $LAMEmiscSourceSampleFrequencyLookup = array( 0 => '<= 32 kHz', 1 => '44.1 kHz', 2 => '48 kHz', 3 => '> 48kHz' ); return (isset($LAMEmiscSourceSampleFrequencyLookup[$SourceSampleFrequencyID]) ? $LAMEmiscSourceSampleFrequencyLookup[$SourceSampleFrequencyID] : ''); }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.