error_backtrace.php

function process_error_backtrace($errno, $errstr, $errfile, $errline, $errcontext) {
			    if(!(error_reporting() & $errno))
			        return;
			    switch($errno) {
			    case E_WARNING      :
			    case E_USER_WARNING :
			    case E_STRICT       :
			    case E_NOTICE       :
			    case E_USER_NOTICE  :
			        $type = 'warning';
			        $fatal = false;
			        break;
			    default             :
			        $type = 'fatal error';
			        $fatal = true;
			        break;
			    }
			    $trace = array_reverse(debug_backtrace());
			    array_pop($trace);
			    if(php_sapi_name() == 'cli') {
			        echo 'Backtrace from ' . $type . ' \'' . $errstr . '\' at ' . $errfile . ' ' . $errline . ':' . "\n";
			        foreach($trace as $item)
			            echo '  ' . (isset($item['file']) ? $item['file'] : '<unknown file>') . ' ' . (isset($item['line']) ? $item['line'] : '<unknown line>') . ' calling ' . $item['function'] . '()' . "\n";
			    } else {
			        echo '<p class="error_backtrace">' . "\n";
			        echo '  Backtrace from ' . $type . ' \'' . $errstr . '\' at ' . $errfile . ' ' . $errline . ':' . "\n";
			        echo '  <ol>' . "\n";
			        foreach($trace as $item)
			            echo '    <li>' . (isset($item['file']) ? $item['file'] : '<unknown file>') . ' ' . (isset($item['line']) ? $item['line'] : '<unknown line>') . ' calling ' . $item['function'] . '()</li>' . "\n";
			        echo '  </ol>' . "\n";
			        echo '</p>' . "\n";
			    }
			    if(ini_get('log_errors')) {
			        $items = array();
			        foreach($trace as $item)
			            $items[] = (isset($item['file']) ? $item['file'] : '<unknown file>') . ' ' . (isset($item['line']) ? $item['line'] : '<unknown line>') . ' calling ' . $item['function'] . '()';
			        $message = 'Backtrace from ' . $type . ' \'' . $errstr . '\' at ' . $errfile . ' ' . $errline . ': ' . join(' | ', $items);
			        error_log($message);
			    }
			    if($fatal)
			        exit(1);
			}

			set_error_handler('process_error_backtrace');