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copied!<p>My script for installing an error handler that produces a backtrace:</p> <pre><code><?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'); ?> </code></pre> <p>Caveat: it is powerless to affect various <a href="http://us.php.net/set_error_handler" rel="noreferrer">'PHP Fatal Errors'</a>, since Zend in their wisdom decided that these would ignore <code>set_error_handler()</code>. So you still get useless final-location-only errors with those.</p>

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