Description:
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There is a mismatch/bug under PHP 5.2.5( id don't try it in other version)

CONTEXT :

Serialize an Object with Private vars in a text file using 
fopen no binary and fwrite.



RESULT :

serialize Object is forced to bad binary mode in file.
if you change private vars to public vars it work !...


SOLUTION :
1 but poor => encode_base_64(Serialized Objet)
2 good => use fopen in binary mode