php - $_POST data not being sent -

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i have simple form working , im finding post data isnt being sent , can't see problem

<form role="form" name="challengeform" action="scripts/arena_setup.php" method="post" onsubmit="return confirm('are sure want attack player?');">     <input type="hidden" name="member_id" value="<? echo $member_id;?>">     <input type="image" src="img/map/attack.png" alt="attack" /> </form>

which being handled by

if(isset($_post['challengeform'])){  ... }else{ echo 'error'; }

it shows error due post data being missing cant see i've done. ideas?

if(isset($_post['challengeform']))

form names not part of post data. fields within form.

try testing field itself

if(isset($_post['member_id']))

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