JavaScript-Sina Cloud Server can only use form request to session, Ajax but not to request??

When writing the php验证码 page, the php file is stored on the Sina cloud server, want to use the javascript Ajax request in the page session to verify the verification code, feel that this method should be feasible, but the actual operation, but found that ajax the use of the session always empty , and did not request to, one is the code is wrong, think, all kinds of consulting, finally found that the Netizen said that Sina Cloud can not save session , but I use to form do the request, but it is possible to get the session value, this for what, solve ...

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When writing the php验证码 page, the php file is stored on the Sina cloud server, want to use the javascript Ajax request in the page session to verify the verification code, feel this method should be feasible, but the actual operation, but found that ajax the use of the session always empty, And did not request to, one is the code is wrong, think, all kinds of consulting, finally found that the Netizen said that Sina Cloud can not save session , but I use to form do the request, but to get the session value, this for what, solve ...

Without the framework, the PHP file must be preceded by session_start (), and then the file will be $_session.

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