Error handling in PHP with Error logger working

Logging errors in php is easy, cool and helpful when it comes to test the site for errors as I explained it in my earlier post Logging errors to file in PHP but only till the site is at developer’s end and you working on it. Once you take the site live its just not good anymore. Once you take it on the production end, you cannot show the errors to the user or in case if its even 100% error free you will find that 1 in a 100 person who likes to messup with the sites. Being a programmer you gotta be ready for it. This is the place where comes error handling into play.

Here is a simple script. Just place these two functions in a file and include it at the right place. Probably including from the point onward from where you expect and error would be just perfect.

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// Define a custom error handler
function userErrorHandler($errno, $errstr, $errfile = '', $errline = 0, $errcontext = array())
{
	// Getting error type
	$errorType = array (
			E_ERROR			=> 'ERROR',
			E_WARNING		=> 'WARNING',
			E_PARSE			=> 'PARSING ERROR',
			E_NOTICE		=> 'NOTICE',
			E_CORE_ERROR		=> 'CORE ERROR',
			E_CORE_WARNING		=> 'CORE WARNING',
			E_COMPILE_ERROR		=> 'COMPILE ERROR',
			E_COMPILE_WARNING	=> 'COMPILE WARNING',
			E_USER_ERROR		=> 'USER ERROR',
			E_USER_WARNING		=> 'USER WARNING',
			E_USER_NOTICE		=> 'USER NOTICE',
			E_STRICT		=> 'STRICT NOTICE',
			E_RECOVERABLE_ERROR	=> 'RECOVERABLE ERROR'
				);
 
		if (array_key_exists($errno, $errorType)) {
			$err = $errorType[$errno];
		} else {
			$err = 'CAUGHT EXCEPTION';
		}
 
		// Getting the error log file from php.ini
		$file 		= ini_get('error_log');
 
		// Creating the error log script, same as normal logger would do
		$error_string 	= "[" . date("d-M-Y H:i:s", $_SERVER['REQUEST_TIME']) . '] PHP ' . $err . '::' . $errstr . " in " . $_SERVER['SCRIPT_FILENAME'] . " on line " . $errline . "\r\n";
 
		// Logging error to a certain file
		error_log($error_string, 3, $file);
 
		// Check if the error code is not included in error_reporting
		if (!(error_reporting() & $errno))
		{
			return;
		}
 
		// Restore default handlers to prevent errors in errors
		restore_error_handler();
		if (function_exists('restore_exception_handler'))
		{
			restore_exception_handler();
		}
 
		// Load error page
		require('_errors/error.php');
		exit();
	}
	set_error_handler('userErrorHandler');
 
	// Define a custom handler for uncaught exceptions
	if (function_exists('set_exception_handler'))
	{
		function userExceptionHandler($exception)
		{
			// Restore default handlers to prevent errors in errors
			restore_error_handler();
			if (function_exists('restore_exception_handler'))
			{
				restore_exception_handler();
			}
 
			// Load error page
			require('error.php');
			exit();
		}
		set_exception_handler('userExceptionHandler');
	}

Note: Once you start error handling in real time error logging stops. To overcome this a short code is included inside the function that uses PHP’s error_log function to log errors. So if you have a specifc error log file, just point it towards that.

Good luck!!!

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