wp-includes/formatting.php:2830Adds slashes to a string or recursively adds slashes to strings within an array.
$gpcstring|arraystring|arrayfunction addslashes_gpc( $gpc ) { return wp_slash( $gpc );}Introduced in 0.71. Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-includes/formatting.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.