Hi everybody,

I'm implementing a Log system for PHP, and I'm a bit stuck. All the configuration is defined in an XML file, that declares every method to be logged. XML is well parsed and converted into a multidimensionnal array (classname => array of methods). So far, so good.

Let's take a simple example:

#A.php
class A {
    public function foo($bar) {
        echo ' // Hello there !';
    }

public function bar($foo) {
    echo " $ù$ùmezf$z !";
}
}

#B.php
class B {
public function far($boo) {
    echo $boo;  
}
}

Now, let's say I've this configuration file:

<interceptor>
<methods class="__CLASS_DIR__A.php">
        <method name="foo">
    <log-level>INFO</log-level>
    <log-message>Transaction init</log-message>
        </method>
</methods>  
<methods class="__CLASS_DIR__B.php">
        <method name="far">
    <log-level>DEBUG</log-level>
    <log-message>Useless</log-message>
        </method>
</methods>
</interceptor>

The thing I'd like AT RUNTIME ONLY (once the XML parser has done his job) is:

#Logger.php (its definitely NOT a final version) -- generated by the XML parser
class Logger {
public function __call($name,$args) {
    $log_level = args[0];
    $args = array_slice($args,1);
    switch($method_name) {
        case 'foo':
        case 'far':
        //case .....
            //write in log files
            break;

    }
    //THEN, RELAY THE CALL TO THE INITIAL METHOD
 }
}

#"dynamic" A.php
class A extends Logger {
    public function foo($log_level, $bar) {
        echo ' // Hello there !';
    }

public function bar($foo) {
    echo " $ù$ùmezf$z !";
}
}

#"dynamic" B.php
class B extends Logger {
public function far($log_level, $boo) {
    echo $boo;  
}
}

The big challenge here is to transform A and B into their "dynamic" versions, once the XML parser has completed its job. The ideal would be to achieve that without modifying the code of A and B at all (I mean, in the files) - or at least find a way to come back to their original versions once the program is finished.

To be clear, I wanna find the most proper way to intercept method calls in PHP. What are your ideas about it ???

Thanks in advance, Rolf