What is the output when the following code is executed? function callFun( &$arg ) { $return = $arg; $arg += 1; return $return; } $a = 3; $b = callFun( $a ); $c = callFun($a); echo $a; echo ' \n '; echo $b; echo ' \n '; echo $c; 

The PDO_MYSQL Data Source Name (DSN) is composed of the following elements?

Which is a callback function or object method taking the following parameters?

Commands for mysqlnd or libmysqlclient configuration?

How can you switch connection to appropriate shard and insert record of the manual partition?

The global transaction is either ended by calling __ or by __ in case of an error?

Which returns an array with elements in reverse order?

What will it output?

Recommended standard (short_opentag=Off) for opening and closing a PHP code block?

Which type is not supported by PHP?

Which PHP function randomizes the order of the elements in an array?