php form process -- junior question

I have come across scripts that use:

as well as code that uses:

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 ChongCommented:
this is to check if there is an element called "submit" was posted

this is to confirm if the request that sent was from POST method (instead of querystring GET, etc)
Ryan ChongCommented:
>>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:

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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