Cakephp 2.2.1 is don't work on linux

this is a login demo,source code: 

$username= $this->data['Login']['username']; 
$password= md5($this->data['Login']['password']); 
$user = $this->Login->find('first',array('conditions'=>array( 'Login.username = '=>$username, 'Login.password = '=>$password )));
print_r($user);
exit ;

on my pc(windows 7/php5.3.8/apache2) is ouput: 

Array ( [Login] => Array ( [id] => 9 [username] => aaaaaa [password] => 04b35cf604476680b22c4bb8b0888e4a [created] => 2012-08-03 10:13:38 [groupid] => 10 [status] => 1 [lastlogintime] => 2012-08-03 10:14:07 [lastloginip] => 192.168.12.78 [logincount] => 2 ) )

but,on linux server(Centos/nginx/php5.3.5) is ouput:

Array ( [0] => Array ( [id] => 9 [username] => aaaaaa [password] => 04b35cf604476680b22c4bb8b0888e4a [created] => 2012-08-03 10:13:38 [groupid] => 10 [status] => 1 [lastlogintime] => 2012-08-03 10:14:07 [lastloginip] => 192.168.12.78 [logincount] => 2 ) )

Why is it so???

please help me

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