PHP notice:unserialize (): Error at offset by bytes in on line solution

Using the Unserialize function to save data to the database encountered this error, and later found that the gb2312 converted to utf-8 format, after the number of bytes per Chinese from 2 to 3, resulting in the deserialization of the time to determine the character length problem, So you need to recalculate the value of the character length in the serialized array using a regular expression, with the following code:

function mb_unserialize ($serial _str) {    $out = Preg_replace_callback ('!s: (\d+): "(. *?)";! S ', function ($r) {return ' s: '. strlen ($r [2]). ': '. $r [2]. ' "; ';}, $serial _str);    Return Unserialize ($out);}

　　

PHP notice:unserialize (): Error at offset by bytes in on line solution