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how i can i change the content of a page without refreshing.I know we need to use hidden frames for this but all the tutorials i have come across teach this only for HTML files what if the content is returned from a PHP file how do i do it in such a case? what should the php file echo or return?
If you use a hidden frame, the content won’t be displayed (hence “hidden”), I think you just mean to use an iframe. But this doesn’t fit your description of “without refreshing”, since you have to refresh the frame.
When loading the PHP file inside the frame, your PHP file just needs to generate HTML the same way you would generate a normal page. It’s the same whether the PHP file is loaded inside a frame or not.