The difference between the if ($_post[submit]) and the IF (Isset ($_post[submit)) _php skills when submitting a form in PHP

Source: Internet
Author: User
This should be done with if (Isset ($_post[' submit ')) {
}
difference between if ($_post[submit]) and if (Isset ($_post[submit)) when submitting a form

The first method will show a warning, the second is relatively more rigorous.
There is also the post of the key name preferably with single quotes, so the efficiency is slightly higher (about 3-4 times).
Well, that's pretty much what that means, if you set this variable, you return True.

What do you mean in PHP if (isset ($_post[' Submit '))
Isset--Detects whether a variable is set

To determine if the data sent over is submitted.
Copy Code code as follows:

if (Isset ($_post["Submit"]) {
echo "Filed over";
}else
{
echo "Submit is no come~";
}
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