wp-includes/l10n.php:441Translates string with gettext context, and escapes it for safe use in an attribute.
$textstring$contextstring$domainstringoptional'default'stringfunction esc_attr_x( $text, $context, $domain = 'default' ) { return esc_attr( translate_with_gettext_context( $text, $context, $domain ) );}Introduced in 2.8.0. Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-includes/l10n.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.