ErrorHandler.php

<?php

namespace Bugsnag;

class ErrorHandler
{
    private
        $client,
        $oldExceptionHandler,
        $oldErrorHandler,
        $reservedMemory;

    public function __construct($client)
    {
        $this->client = $client;
    }

    public function enable()
    {
        $this->oldExceptionHandler = set_exception_handler(array($this, 'handleException'));
        $this->oldErrorHandler = set_error_handler(array($this, 'handleError'), error_reporting());
        register_shutdown_function(array($this, 'handleFatalError'));
        $this->reservedMemory = str_repeat('x', 1024 * 10);
    }

    public function handleException($e)
    {
        $this->client->exceptionHandler($e);
        if ($this->oldExceptionHandler) {
            call_user_func($this->oldExceptionHandler, $e);
        }
    }

    public function handleError($code, $message, $file = '', $line = 0, $context=array())
    {
        $this->client->errorHandler($code, $message, $file='', $line=0);
        if ($this->oldErrorHandler) {
            call_user_func($this->oldErrorHandler, $code, $message, $file, $line, $context);
        }
    }

    // Stolen from Sentry:
    // https://github.com/getsentry/raven-php/blob/8534b131f296597c163cbc408ac2d914f43a1a2c/lib/Raven/ErrorHandler.php
    public function handleFatalError()
    {
        if (null === $lastError = error_get_last()) {
            return;
        }

        unset($this->reservedMemory);

        $errors = E_ERROR | E_PARSE | E_CORE_ERROR | E_CORE_WARNING | E_COMPILE_ERROR | E_COMPILE_WARNING | E_STRICT;

        if ($lastError['type'] & $errors) {
            $e = new ErrorException(
                @$lastError['message'], @$lastError['type'], @$lastError['type'],
                @$lastError['file'], @$lastError['line']
            );
            $this->handleException($e, true);
        }
    }
}