Can anybody explain about the concept of hidden variables in php?

Question

Can anybody explain about the concept of hidden variables in php?

Answer 1

Hidden variables are actually part of HTML. They (usually?) lie within an HTML "form". Because form fields are passed in the PHP-defined array, $_POST, when the form is submitted, they give you a way to pass more data/arguments than just user-entered form data.



A common way to use a hidden form field might be to set both a visible text field and hidden form field to the same initial value, say from a DB query. Then, when the form is submitted, server-side PHP can compare $_POST['visible_form_field'] to $_POST['hidden_form_field'] and know on the server, whether the value was changed by the user before submitting.



A hidden form field might also be set, when the form is built on the server (before being sent to the browser) with some limit value that client-side javascript could use (by referencing the document model) to validate user input within the browser.

Answer 2

you may no longer "hide" the consultation variables. The person isn't waiting to be certain them until you echo, var_dump, or teach them etc. i might verify all consultation variables until now permitting something to flow on (for share internet hosting it fairly is a ought to). $_SESSION is a great international and continuously would be there despite the fact that if the array is empty. in case you such as you may set up a "consultation" style device with a database and use that quite of the $_SESSION or $_COOKIE.

Answer 3

hidden variable used pass values when submits the form.

These are usefull when we want to pass kknow values to next page stores in hidden form element

see for more.



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