function DatabaseConnection_mysql::utf8mb4IsSupported

Overrides DatabaseConnection::utf8mb4IsSupported

File

includes/database/mysql/database.inc, line 634

Class

DatabaseConnection_mysql

Code

public function utf8mb4IsSupported() {
    // Ensure that the MySQL driver supports utf8mb4 encoding.
    $version = $this->connection
        ->getAttribute(PDO::ATTR_CLIENT_VERSION);
    if (strpos($version, 'mysqlnd') !== FALSE) {
        // The mysqlnd driver supports utf8mb4 starting at version 5.0.9.
        $version = preg_replace('/^\\D+([\\d.]+).*/', '$1', $version);
        if (version_compare($version, '5.0.9', '<')) {
            return FALSE;
        }
    }
    else {
        // The libmysqlclient driver supports utf8mb4 starting at version 5.5.3.
        if (version_compare($version, '5.5.3', '<')) {
            return FALSE;
        }
    }
    // Ensure that the MySQL server supports large prefixes and utf8mb4.
    try {
        $this->query("CREATE TABLE {drupal_utf8mb4_test} (id VARCHAR(255), PRIMARY KEY(id(255))) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci ROW_FORMAT=DYNAMIC ENGINE=INNODB");
    } catch (Exception $e) {
        return FALSE;
    }
    $this->query("DROP TABLE {drupal_utf8mb4_test}");
    return TRUE;
}