Some browsers cache the verification code, causing the verification code to expire when you re-open the page. -Php Tutorial

Some browsers cache the verification code, causing the verification code to expire when you re-open the page. Refresh the browser.
How can this problem be solved? what code can force the verification code to be reloaded.

Reply to discussion (solution)

Add a random js parameter to the generated address, url? R = Math. random ()

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You add the forbidden cache header to the verification code image generation program.

header ("Expires: Mon, 26 Jul 1997 05:00:00 GMT");    // Date in the pastheader ("Last-Modified: " . gmdate("D, d M Y H:i:s") . " GMT");header ("Cache-Control: no-cache, must-revalidate");  // HTTP/1.1header ("Pragma: no-cache");                          // HTTP/1.0

You can solve this problem once and for all without changing the url whenever you use it.

Math. random ()

The code is:

Both are added.

You add the forbidden cache header to the verification code image generation program.

header ("Expires: Mon, 26 Jul 1997 05:00:00 GMT");    // Date in the pastheader ("Last-Modified: " . gmdate("D, d M Y H:i:s") . " GMT");header ("Cache-Control: no-cache, must-revalidate");  // HTTP/1.1header ("Pragma: no-cache");                          // HTTP/1.0

You can solve this problem once and for all without changing the url whenever you use it.

This cannot be added.