Checks whether utf8mb4 support is available on the current database system.

Return value

bool

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ドル', $version);
 if (version_compare ($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;
}

---