wp-admin/includes/upgrade.php:3681Checks the version of the installed MySQL binary.
function wp_check_mysql_version() { global $wpdb; $result = $wpdb->check_database_version(); if ( is_wp_error( $result ) ) { wp_die( $result ); }}Introduced in 2.1.0. Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-admin/includes/upgrade.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.