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8 years ago
You can use the following code to use the php 7 unserialize function in php 5.3 and upwards. This adds the $option argument.

<?php

namespace
{

/**
 * PHP 7 unserialize function for PHP 5.3 upwards.
 * Added the $option argument (allowed_classes).
 * See php unserialize manual for more detail.
 **/
function php7_unserialize($str, $options = array())
{
  if(version_compare(PHP_VERSION, '7.0.0', '>='))
  { return unserialize($str, $options); }

  $allowed_classes = isset($options['allowed_classes']) ? 
    $options['allowed_classes'] : true;
  if(is_array($allowed_classes) || !$allowed_classes)
  {
    $str = preg_replace_callback(
      '/(?=^|:)(O|C):\d+:"([^"]*)":(\d+):{/', 
      function($matches) use ($allowed_classes)
      {
        if(is_array($allowed_classes) && 
          in_array($matches[2], $allowed_classes))
        { return $matches[0]; }
        else
        {
          return $matches[1].':22:"__PHP_Incomplete_Class":'.
            ($matches[3] + 1).
            ':{s:27:"__PHP_Incomplete_Class_Name";'.
            serialize($matches[2]);
        }
      },
      $str
    );
  }
  unset($allowed_classes);
  return unserialize($str);
}

} // namespace

namespace my_name_space
{
  /**
   * Use the new php7 unserialize in your namespace without
   * renaming all unserialize(...) function calls to 
   * php7_unserialize(...).
   **/
  function unserialize($str, $options = array())
  { return php7_unserialize($str, $options); }
}

?>
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