PHP session does not support the number of words as key reason

PHP session does not support the reason that the number is a key

Php_serialize is available from PHP 5.5.4. Php_serialize uses plain serialize/unserialize function internally and does not having limitations that PHP and Php_binary h Ave. Older serialize handlers cannot store numeric index nor string index contains special characters (| and!) in $_sessi On. Use Php_serialize to avoid numeric index or special character errors at script shutdown.

reference:? http://stackoverflow.com/questions/18797251/notice-unknown-skipping-numeric-key-1-in-unknown-on-line-0

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