php form process -- junior question

I have come across scripts that use:

isset($_POST['submit'])
as well as code that uses:

$_SERVER['REQUEST_METHOD']=='POST'
to check if a form has been sent.

I was wondering the difference between these two and which method is best.
Zoe ZoeAsked:
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Ryan ChongBusiness Systems Analyst , ex-Senior Application EngineerCommented:
>>isset($_POST['submit'])
this is to check if there is an element called "submit" was posted

>>$_SERVER['REQUEST_METHOD']=='POST'
this is to confirm if the request that sent was from POST method (instead of querystring GET, etc)
Ryan ChongBusiness Systems Analyst , ex-Senior Application EngineerCommented:
>>I was wondering the difference between these two and which method is best.
since we are looking for the posted elements, we can usually use the first method directly, like:
<?php

if (isset($_POST['<yourelement>'])) {
  //other validation/process here...
}

?>

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Dave BaldwinFixer of ProblemsCommented:
They check different things.  But if isset($_POST['submit']) is true, then the form must have been sent since you have data from it.
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