Error PHP, no sé que falla..

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Código PHP:

$conn = &ADONewConnection('mysql'); 
 
         $conn->PConnect('localhost','userid','password','database');
 
         
 
         # or dsn 
 
         $dsn = 'mysql://user:pwd@localhost/mydb'; 
 
         $conn = ADONewConnection($dsn);  # no need for Connect()
 
         
 
         # or persistent dsn
 
         $dsn = 'mysql://user:pwd@localhost/mydb?persist'; 
 
         $conn = ADONewConnection($dsn);  # no need for PConnect()
 
         
 
         # a more complex example:
 
         $pwd = urlencode($pwd);
 
         $flags =  MYSQL_CLIENT_COMPRESS;
 
         $dsn = "mysql://user:$pwd@localhost/mydb?persist&clientflags=$flags";
 
         $conn = ADONewConnection($dsn);  # no need for PConnect()