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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\UndefinedFunctionException;
  16  
  17  /**
  18   * ErrorHandler for undefined functions.
  19   *
  20   * @author Fabien Potencier <fabien@symfony.com>
  21   */
  22  class UndefinedFunctionFatalErrorHandler implements FatalErrorHandlerInterface
  23  {
  24      /**
  25       * {@inheritdoc}
  26       */
  27      public function handleError(array $error, FatalErrorException $exception)
  28      {
  29          $messageLen = \strlen($error['message']);
  30          $notFoundSuffix = '()';
  31          $notFoundSuffixLen = \strlen($notFoundSuffix);
  32          if ($notFoundSuffixLen > $messageLen) {
  33              return null;
  34          }
  35  
  36          if (0 !== substr_compare($error['message'], $notFoundSuffix, -$notFoundSuffixLen)) {
  37              return null;
  38          }
  39  
  40          $prefix = 'Call to undefined function ';
  41          $prefixLen = \strlen($prefix);
  42          if (0 !== strpos($error['message'], $prefix)) {
  43              return null;
  44          }
  45  
  46          $fullyQualifiedFunctionName = substr($error['message'], $prefixLen, -$notFoundSuffixLen);
  47          if (false !== $namespaceSeparatorIndex = strrpos($fullyQualifiedFunctionName, '\\')) {
  48              $functionName = substr($fullyQualifiedFunctionName, $namespaceSeparatorIndex + 1);
  49              $namespacePrefix = substr($fullyQualifiedFunctionName, 0, $namespaceSeparatorIndex);
  50              $message = sprintf('Attempted to call function "%s" from namespace "%s".', $functionName, $namespacePrefix);
  51          } else {
  52              $functionName = $fullyQualifiedFunctionName;
  53              $message = sprintf('Attempted to call function "%s" from the global namespace.', $functionName);
  54          }
  55  
  56          $candidates = [];
  57          foreach (get_defined_functions() as $type => $definedFunctionNames) {
  58              foreach ($definedFunctionNames as $definedFunctionName) {
  59                  if (false !== $namespaceSeparatorIndex = strrpos($definedFunctionName, '\\')) {
  60                      $definedFunctionNameBasename = substr($definedFunctionName, $namespaceSeparatorIndex + 1);
  61                  } else {
  62                      $definedFunctionNameBasename = $definedFunctionName;
  63                  }
  64  
  65                  if ($definedFunctionNameBasename === $functionName) {
  66                      $candidates[] = '\\'.$definedFunctionName;
  67                  }
  68              }
  69          }
  70  
  71          if ($candidates) {
  72              sort($candidates);
  73              $last = array_pop($candidates).'"?';
  74              if ($candidates) {
  75                  $candidates = 'e.g. "'.implode('", "', $candidates).'" or "'.$last;
  76              } else {
  77                  $candidates = '"'.$last;
  78              }
  79              $message .= "\nDid you mean to call ".$candidates;
  80          }
  81  
  82          return new UndefinedFunctionException($message, $exception);
  83      }
  84  }