Php prompts Notice: unserialize () [function. unserialize]: Error solution

There may be several reasons for this error. The answer to the online search is basically targeted. The key is how to find the cause and solve it.

Analysis 1: encoding error during data storage and deserialization

This is very common, for example, originally stored in GBK encoding, and then UTF-8 encoding, then in the unserialize () there will be a problem;

Solution 1: convert the data of UTF-8 encoding into GBK, PHP can use iconv () function;

Analysis 2: rewrite reverse sequence functions

In some cases, you can rewrite the underlying function and convert gb2312 to UTF-8 format, the number of bytes per Chinese character increases from 2 to 3, leading to a problem in determining the character length during deserialization, therefore, you need to use a regular expression to re-calculate the character length value in the serialized array. The code is as follows:

Function mb_unserialize ($ serial_str ){
$ Out = preg_replace ('! S :( \ d + ):"(.*?) ";! Se ', "s:'. strlen ('$ 2').': \" $2 \ "; '", $ serial_str );
Return unserialize ($ out );
}

Solution 3:Perform base64_encode on the character data, and then serialize serialization. During restoration and extraction, unserialize () and base64_decode