<?php
class mysqlDatabase extends dBase { /* ... code here ... */ }
$DB = mysqlDatabase::instance();
$DB->execute("SELECT * FROM foobar WHERE"); // Should throw errors, 'WHERE clause is empty'
// What happens here?


// Personally, I would do something like this:
class Logger {
    function Log($message) {
        // Log $message
    }
}

function defaultExceptionHandler($E) {
    // I would actually probably try to throw up a pretty page, if I had the time
    header('HTTP/1.1 500'); // Set internal service error header
    print "An error has occurred: " . $E->getMessage();
    die();
}


class DBase {
    function execute($query) {
        try {
            $this->_dbh->exec($query);
        } catch PDOExeption $E {
            Logger::Log($E->getMessage(0);
            throw $E;
        }
    }
}


// Usage example:
$DB->execute("I am not a valid SQL query");
// What happens now is Logger::Log() got called
// Since I didn't catch the exception, DefaultExceptionHandler() was called which prints a message and dies.