Excluding objects when print_r()ing variables in a custom logger - php

Question

I have Logger-Class which is logging everything. Objects will be logged with print_r to a human-readable state. My Problem is that I have a big MVC-Object. Everytime an Exception or Error occurs, the MVC-Object will also be printed in the Log by print_r. This results in a very very long Logfile that is not really friendly to read.
I tried to set a __toString() method to my MVC-Class but this don't work. I also get the complete MVC-Object in Log. The MVC is a Singleton and is referenced on every Object. So to simple exclude the Object before it cames into the print_r is not that easy.
Is there any way to exclude Objects from print_r?
My Methods:
LOG-Class errorHandler-Method:
public static function errorHandler($errno, $errstr, $errfile, $errline, $vars) {
//If # is set, don't do anything!
if(error_reporting() === 0) {
return;
}
//Get StackTrace with low memory usage ;)
$e = new Exception();
$stackStr = $e->getTraceAsString();
//Build ErrorMessage for Log
$message = 'File: '.$errfile.' - L: '.$errline."\n".
'Code: '.$errno."\n".
'Message: '.$errstr."\n".
'Vars: '.print_r($vars, true)."\n".
'Stacktrace: '.$stackStr;
self::error($message);
}
LOG-Class exceptionHandler-Method:
public static function exceptionHandler(Exception $e) {
$message = get_class($e).': '.$e->getMessage()."\n".
'File: '.$e->getFile().' - L: '.$e->getLine()."\n".
'Code: '.$e->getCode()."\n".
'Message: '.$e->getMessage()."\n".
'Stacktrace: '.$e->getTraceAsString();
self::error($message);
}
LOG-Class error-Method:
public static function error($data, $file='system.log') {
$config = Megaira_PropertyConfiguration::getInstance();
switch($config->get('LOG_MODE')) {
case'DEEPDEBUG':
case'ERROR':
case'WARNING':
case'INFO':
case'DEBUG':
self::writeToLog('ERROR', $data, $file);
break;
}
}
LOG-Class writeToLog-Method:
private static function writeToLog($mode='', $text='', $file=''){
if(!is_string($text) && !is_numeric($text)) {
$text = print_r($text, true);
}
$config = Megaira_PropertyConfiguration::getInstance();
if(!$config->get('LOGGINGACTIVE')) { return; }
self::writeLineToFile($mode, $text, $file);
}
Setup the Error- and Exception-handler:
//Set Error and Exception Handler
set_error_handler(array(new LOG(), 'errorHandler'));
set_exception_handler(array(new LOG(), 'exceptionHandler'));
Thanks
Some Testing:
public static function print_r_filtered($object, $ret=false) {
$filtered = array(
'Megaira_MVC'
);
$text = print_r($object, true);
foreach($filtered as $filter) {
$search = '#('.$filter.'\sObject)\n(\s+)\).*?\n\2\)\n#s';
$replace = "$1";
$text = preg_replace($search, $replace, $text);
}
if($ret)
return $text;
echo $text;
}
Did not work. Maybe RegEx fail?
Solution:
It was a Design flaw. The errorHandler is Logging all Objects that are used on the place the error occurs. So in the index.php are the following code:
$mvc = Megaira_MVC::getInstance();
So this peace of code produced a logging of the Var $mvc with print_r through the errorHandler in LOG-Class.
Conclusion for me: Don't use Variables on big Singleton-Objects or use unset() if the Var is not needed anymore.

Answer 1

__toString() is called, when the object is casted to a string. You may try something like
$objectString = method_exists($object, '__toString')
? (string) $object
: print_r($object, true);
Use is_object() to find out, if a value is an object or not.
At all
$string = !is_object($value) || method_exists($value, '__toString')
? (string) $value
: print_r($value, true);

Answer 2

You could wrap print_r with your own function that checks whether the provided data includes any objects, using the is_object() function. Similarly, you could use is_a() if you only want to exclude certain classes of objects.

Answer 3

as a html solution you can use:
<pre><?=print_r(log_content);?></pre>
to display your log file better. I am displaying the log files in this way.

Answer 4

if (is_object( $foo ))
{
print_r( $foo->__toString() );
} else {
print_r( $foo );
}

Answer 5

If you can alter the Logger class, you can check for the class befpre you print it:
if(!($var instanceof HeavyMVCObject)){
print_r($var);
}