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@ed-fruty ed-fruty/Unserializer.php
Last active May 13, 2016

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PHP DESERIALIZE (UNSERIALIZE) STRING WITH NON UTF8 CHARACTERS
<?php
/**
* If you have serialized data, which have non utf-8 characters, probably you'll have a problem in deserialization (unserialization).
* So, what we need to do is to unserialize out serialized data properly?
* 1. Replace all non utf-8 characters to '?'
* 2. Update serialized data length
* 3. Deserialize
*
* Let's go!
*/
class Unserializer
{
/**
* @var string
* @link https://magp.ie/2014/08/13/php-unserialize-string-after-non-utf8-characters-stripped-out/
* @link https://magp.ie/2011/01/06/remove-non-utf8-characters-from-string-with-php/
*
* For reject overly long 2 byte sequences, as well as characters above U+10000 and replace with ? you can use bellow regex
* '/[\x00-\x08\x10\x0B\x0C\x0E-\x19\x7F]'.
* '|[\x00-\x7F][\x80-\xBF]+'.
* '|([\xC0\xC1]|[\xF0-\xFF])[\x80-\xBF]*'.
* '|[\xC2-\xDF]((?![\x80-\xBF])|[\x80-\xBF]{2,})'.
* '|[\xE0-\xEF](([\x80-\xBF](?![\x80-\xBF]))|(?![\x80-\xBF]{2})|[\x80-\xBF]{3,})/S'
*
* For reject overly long 3 byte sequences and UTF-16 surrogates and replace with ? you can use bellow regex:
* '/\xE0[\x80-\x9F][\x80-\xBF]'.
* '|\xED[\xA0-\xBF][\x80-\xBF]/S'
*-----------------------------------------------------------------
*
* At the stackoverflow (http://stackoverflow.com/questions/1176904) guys advice to use many variants of regex, like:
* '/[[:cntrl:]]+/'
* or
* '/[^[:print:]]/'
*
* You may use any one you want
*/
protected $nonCharsRegex = '/[\x00-\x1F\x80-\xFF]/';
/**
* Replace non chars to the property value.
* It can be null or any other.
*
* @var string
*/
protected $replaceTo = '?';
/**
* Unserialize serialized string.
* Firstly try to unserialize it using basic unserialization.
* If it's impossible, call additional functionality for the unserialization.
*
* @param string $message
* @return mixed
*/
public function unserialize($message)
{
$record = @unserialize($message);
/** @link http://php.net/manual/en/function.unserialize.php#refsect1-function.unserialize-notes */
if ($message !== false && $record === false) {
$message = $this->replaceSpecialChars($message);
$message = $this->updateSerializedMessage($message);
$record = @unserialize($message);
}
return $record;
}
/**
* Remove non utf-8 chars.
* It matches anything in range 0-31, 128-255 and replace it to '?'.
*
* @param string $message
* @return string
*/
protected function replaceSpecialChars($message)
{
return preg_replace($this->nonCharsRegex, $this->replaceTo , $message);
}
/**
* Update serialized message (make it valid).
*
* @param string $message
* @return string
*/
protected function updateSerializedMessage($message)
{
return preg_replace_callback(
'!s:(\d+):"(.*?)";!s',
function ($matches) {
if (isset($matches[2])) {
return 's:'.strlen($matches[2]).':"'.$matches[2].'";';
}
},
$message
);
}
}
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