Php judges the difference between if ($ _ POST [submit]) and if (isset ($ _ POST [submit]) when submitting a form.

Source: Internet
Author: User
If (isset ($ _ POST [submit]) does it mean to determine whether the variable $ _ POST [submit] is configured? If this variable is in the execution of other code, use if (isset ($ _ POST ['submit ']) {
Difference between if ($ _ POST [submit]) and if (isset ($ _ POST [submit]) when submitting a form

The first method produces a warning, and the second method is more rigorous.
In addition, it is best to add single quotes to the key name of POST, so the efficiency is slightly higher (about 3-4 times ).
If this variable is set, true is returned.

In PHP, what does if (isset ($ _ POST ['submit ']) mean?
Isset -- check whether the variable is set

Determine whether post data is submitted

The code is as follows:

If (isset ($ _ POST ["submit"]) {
Echo "submitted ";
} Else
Echo "submit is no come ~ ";

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