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   1  <?php
   2  
   3  /*
   4   * This file is part of the Symfony package.
   5   *
   6   * (c) Fabien Potencier <fabien@symfony.com>
   7   *
   8   * For the full copyright and license information, please view the LICENSE
   9   * file that was distributed with this source code.
  10   */
  11  
  12  namespace Symfony\Component\Debug\FatalErrorHandler;
  13  
  14  use Symfony\Component\Debug\Exception\FatalErrorException;
  15  use Symfony\Component\Debug\Exception\UndefinedMethodException;
  16  
  17  /**
  18   * ErrorHandler for undefined methods.
  19   *
  20   * @author Grégoire Pineau <lyrixx@lyrixx.info>
  21   */
  22  class UndefinedMethodFatalErrorHandler implements FatalErrorHandlerInterface
  23  {
  24      /**
  25       * {@inheritdoc}
  26       */
  27      public function handleError(array $error, FatalErrorException $exception)
  28      {
  29          preg_match('/^Call to undefined method (.*)::(.*)\(\)$/', $error['message'], $matches);
  30          if (!$matches) {
  31              return null;
  32          }
  33  
  34          $className = $matches[1];
  35          $methodName = $matches[2];
  36  
  37          $message = sprintf('Attempted to call an undefined method named "%s" of class "%s".', $methodName, $className);
  38  
  39          if (!class_exists($className) || null === $methods = get_class_methods($className)) {
  40              // failed to get the class or its methods on which an unknown method was called (for example on an anonymous class)
  41              return new UndefinedMethodException($message, $exception);
  42          }
  43  
  44          $candidates = [];
  45          foreach ($methods as $definedMethodName) {
  46              $lev = levenshtein($methodName, $definedMethodName);
  47              if ($lev <= \strlen($methodName) / 3 || false !== strpos($definedMethodName, $methodName)) {
  48                  $candidates[] = $definedMethodName;
  49              }
  50          }
  51  
  52          if ($candidates) {
  53              sort($candidates);
  54              $last = array_pop($candidates).'"?';
  55              if ($candidates) {
  56                  $candidates = 'e.g. "'.implode('", "', $candidates).'" or "'.$last;
  57              } else {
  58                  $candidates = '"'.$last;
  59              }
  60  
  61              $message .= "\nDid you mean to call ".$candidates;
  62          }
  63  
  64          return new UndefinedMethodException($message, $exception);
  65      }
  66  }