Description:
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PHP version 5.5.27

I don't know where is the problem exactly but when I unserialize session I got somthing strange as :

[PARAMETRES] => PAGE_PARAMETRES[MOIS]=&PAGE_PARAMETRES[CUTOFF_MONTH_YYYYMM]=201704[...]&PAGE_PARAMETRES[ENDING_DATE_WP_BASELINE]=20180331";}i:14;a:3:{s:10:"CDDIALOGUE";s:3:"FF3";s:6:"CDMNTR";s:4:"FF32";s:10:"PARAMETRES";s:3419:"PAGE_PARAMETRES[CDORG]=A00IB

i tried unserialise from many version of php and I have same result, I think I got data unserialized correctly but i don't know why

Test script:
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foreach (glob("/data/www/alstom/session/sess_48hoc3nks0f8fjb4d36hggg0k7") as $filename) {
        echo "$filename occupe " . filesize($filename) . "\n";

        session_destroy();
        session_start();

        session_decode(file_get_contents($filename));
        print_r($_SESSION);

}