Unserialize():error

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05-15-2017

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Unserialize():error

hi
joomla on it has been used that one of my pprivate web servers the error can be seen in its log

PHP Code:


PHP Notice:  unserialize(): Error at offset 847804 of 847839 bytes in /home/../public_html/libraries/joomla/cache/controller.php on line 176, referer

.

is this error is a serious error ?
is there a solution ?
thanks

mnnn

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LEARN ABOUT PHP

unserialize

UNSERIALIZE(3)								 1							    UNSERIALIZE(3)

unserialize - Creates a PHP value from a stored representation

SYNOPSIS

       mixed unserialize (string  $str)

DESCRIPTION

       unserialize(3) takes a single serialized variable and converts it back into a PHP value.

PARAMETERS

	      o $str
		-  The	serialized string.  If the variable being unserialized is an object, after successfully reconstructing the object PHP will
		automatically attempt to call the __wakeup() member function (if it exists).

	      Note

		     unserialize_callback_func directive

		      It's possible to set a callback-function which will be called, if an undefined class should be instantiated during unserial-
		     izing.  (to  prevent  getting  an	incomplete  object "__PHP_Incomplete_Class".) Use your php.ini, ini_set(3) or .htaccess to
		     define ' unserialize_callback_func'. Everytime an undefined class should be instantiated, it'll be called.  To  disable  this
		     feature just empty this setting.

RETURN VALUES

	The converted value is returned, and can be a boolean, integer, float, string, array or object.

	In case the passed string is not unserializeable, FALSE is returned and E_NOTICE is issued.

CHANGELOG

       +--------+---------------------------------------------------+
       |Version |						    |
       |	|						    |
       |	|		     Description		    |
       |	|						    |
       +--------+---------------------------------------------------+
       | 5.6.0	|						    |
       |	|						    |
       |	|  Manipulating the serialised data by replacing C: |
       |	| with O: to  force  object  instantiation  without |
       |	| calling the constructor will now fail.	    |
       |	|						    |
       +--------+---------------------------------------------------+
EXAMPLES

       Example #1

	      unserialize(3) example

	      <?php
	      // Here, we use unserialize() to load session data to the
	      // $session_data array from the string selected from a database.
	      // This example complements the one described with serialize().

	      $conn = odbc_connect("webdb", "php", "chicken");
	      $stmt = odbc_prepare($conn, "SELECT data FROM sessions WHERE id = ?");
	      $sqldata = array($_SERVER['PHP_AUTH_USER']);
	      if (!odbc_execute($stmt, $sqldata) || !odbc_fetch_into($stmt, $tmp)) {
		  // if the execute or fetch fails, initialize to empty array
		  $session_data = array();
	      } else {
		  // we should now have the serialized data in $tmp[0].
		  $session_data = unserialize($tmp[0]);
		  if (!is_array($session_data)) {
		      // something went wrong, initialize to empty array
		      $session_data = array();
		  }
	      }
	      ?>

       Example #2

	      unserialize_callback_func example

	      <?php
	      $serialized_object='O:1:"a":1:{s:5:"value";s:3:"100";}';

	      // unserialize_callback_func directive available as of PHP 4.2.0
	      ini_set('unserialize_callback_func', 'mycallback'); // set your callback_function

	      function mycallback($classname)
	      {
		  // just include a file containing your classdefinition
		  // you get $classname to figure out which classdefinition is required
	      }
	      ?>

NOTES

       Warning

	      FALSE is returned both in the case of an error and if unserializing the serialized FALSE value. It is possible to catch this special
	      case by comparing $str with serialize(false) or by catching the issued E_NOTICE.

       Warning

	       Do not pass untrusted user input to unserialize(3). Unserialization can result in code being loaded  and  executed  due	to  object
	      instantiation  and  autoloading, and a malicious user may be able to exploit this. Use a safe, standard data interchange format such
	      as JSON (via json_decode(3) and json_encode(3)) if you need to pass serialized data to the user.

SEE ALSO

       serialize(3), Autoloading Objects, unserialize_callback_func, __wakeup().

PHP Documentation Group 													    UNSERIALIZE(3)

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