DatabaseShell fails with PHP 7 and MySQL

The mysql driver was removed from PHP 7.

So this code in DatabaseShell.php fails when the CakePHP configuration has 'datasource' => 'Database/Mysql' and PHP_MAJOR_VERSION >= 7:

$db_driver = explode("/", $db->config['datasource'], 2);

if($db_driver[0] != 'Database')

{ throw new RuntimeException("Unsupported db_method: " . $db_driver[0]); }

$dbc = ADONewConnection($db_driver[1]);

The ADOdb preferred driver for PHP 7 is mysqli. See

http://adodb.org/dokuwiki/doku.php?id=v5:database:mysql

A tested solution that works is

$db_driver = explode("/", $db->config['datasource'], 2);

if($db_driver[0] != 'Database')

{ throw new RuntimeException("Unsupported db_method: " . $db_driver[0]); }

$db_driverName = $db_driver[1];
if(preg_match("/mysql/i", $db_driverName) && PHP_MAJOR_VERSION >= 7)

{ $db_driverName = 'mysqli'; }

$dbc = ADONewConnection($db_driverName);