Question

I don’t know about PHP scripts. Am a iPhone developer. I want to enable Apple Push Notification for my iPhone app. Am following tutorial http://www.raywenderlich.com/3525/apple-push-notification-services-tutorial-part-2. Am getting this following error in my push_development.log file while run the push.php file from Terminal,

Terminal command:

unknownc42c032e8297:~ creagx$ cd /Users/creagx/Desktop/PushChatServer
unknownc42c032e8297:PushChatServer creagx$ php push/push.php development

Error message in push_development.log file:

2012-05-14T10:17:14+05:30 Push script started (development mode)
2012-05-14T10:17:14+05:30 Exiting with fatal error: exception 'PDOException' with message 'SQLSTATE[HY000] [2002] No such file or directory' in /Users/gopi/Desktop/PushChatServer/push/push.php:82
Stack trace:
#0 /Users/gopi/Desktop/PushChatServer/push/push.php(82): PDO->__construct('mysql:host=loca...', 'gopipush', 'uH4q9xQGNAuFW...', Array)
#1 /Users/gopi/Desktop/PushChatServer/push/push.php(36): APNS_Push->__construct(Array)
#2 {main}

I want to know what are the values passing through this command?

// Create a connection to the database.
        $this->pdo = new PDO(
            'mysql:host=' . $config['db']['host'] . ';dbname=' . $config['db']['dbname'], 
            $config['db']['username'], 
            $config['db']['password'],
            array());

        writeToLog('PDO Value: ' . $this->pdo);

I tried to print the PDO values in log file using writeToLog('PDO Value: ' . $this->pdo);. Can anyone please tell me how to know the pdo values? Thanks in advance.

EDIT:

// Create a connection to the database.
        $this->pdo = new PDO(
            'mysql:host=' . $config['db']['host'] . ';dbname=' . $config['db']['dbname'], 
            $config['db']['username'], 
            $config['db']['password'],
            array());

        writeToLog('Host: ' . $config['db']['host']);
        writeToLog('DataBase: ' . $config['db']['dbname']);
        writeToLog('Username: ' . $config['db']['username']);
        writeToLog('Password: ' . $config['db']['password']);

Again got the same error message in log file. I think the writeToLog('Host: ' . $config['db'][‘host’]); line won’t compile until the error fix in $this->pdo line. Is it correct? Please help me. Thanks in advance.

Answer 1

PDO is a class… you can use var_dump to inspect it’s member variables. var_dump outputs directly, so you can catch it with output buffering as follows:

ob_start();
var_dump($this->PDO);
writeToLog('PDO state: ' . ob_get_contents());
ob_end_clean();

To be honest, it’s probably just as easy to do:

writeToLog('Host: ' . $config['db']['host']);
writeToLog('DB: ' . $config['db']['dbname']);
writeToLog('username: ' .  $config['db']['password']);
writeToLog('Password: ' . $config['db']['password']);

This is all assuming that writeToLog is a working function you’ve created. If not, just echo instead.