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Isset function

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Okay this is a newbie question but I know how it works but I just want to know how.

So this code for example:


    // do some stuff

} else {

    // do some else stuff


This if statement will only do its code block if submit button is clicked or in nerds language if $_POST['submit'] is set.
So thats means that value of that submit button is NULL before clicking, but when we click that submit button we are giving it a value?

For example

<input type="submit" name="submit" value="someAwesomeValue">

if I click this button its value will be 'someAwesomeValue' which means I set $_POST['submit'] value to 'someAwesomeValue'

or in other words $_POST['submit'] = 'someAwesomeValue'


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