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Checking if a driver can be loaded

In driver-based packages you should check if the driver exists before loading it. A simple file_exists() does not work since it does not check the include path. fopen()'s third parameter does that, so we use it.

Beispiel 24-1. 


<?php
$driver = 'SomeDriver';
$class  = 'My_Package_Driver_' . $driver;
$file   = str_replace('_', '/', $class) . '.php';

//check if it exists and can be loaded
if (!@fclose(@fopen($file, 'r', true))) {
    throw new My_Package_Driver_Exception(
        'Driver ' . $driver . ' cannot be loaded.'
    );
}

//continue with including the driver
require_once $file;

//...
?>
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