php - isset($_POST['x']) only works if the submit button name="submit" -

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i'm having trouble using postback because i've more 1 form , isset works name="submit" buttons.

my code work fine if use name="submit" if changed name else, isset($_post['somethingelse']) false, why happen?

edit:

<input type="submit" name="submit" value="submit" onclick ="validate(document.getelementbyid('form')); return false;" />  if (isset($_post['submit'])) <-- works expected    <input type="submit" name="asdf" value="submit" onclick ="validate(document.getelementbyid('form')); return false;" />   if (isset($_post['asdf'])) <-- not works expected

edit2: 

<?php $validated = false; if (isset($_post['submit'])) {     // preserve form values storing values $_post variables     $test = $_post['test'];     // validated true submit button submits if validated (script)     $validated = true; } else {     // make variables empty there's no values preserve         $test = ''; }  if (!$validated) { ?> <form id="form" action="<?php echo $_server['php_self'] ?>" method="post"> <p>test: <input type="text" name="test" size="20" value="<?php echo $test ?>" /></p> <p><input type="submit" name="submit" value="submit" onclick ="validate(); return false;" /></p> <?php } ?>

for example here, works expected (i can keep values) name="submit" , if (isset($_post['submit'])) true when button submits if change both name="" , if (isset($_post[''])) not work isset returning false (even though button submits).

it's normal because clicked submit button set , not second, if click on submit button name submit isset($_post['submit']) give true , isset($_post['asdf']) false, , if click on asdf isset($_post['submit']) gives false , isset($_post['asdf']) true, tested , works without problem.

test code:

<?php $validated = false; if (isset($_post['submit'])) {     // preserve form values storing values $_post variables     $test = "submit";     // validated true submit button submits if validated (script)     $validated = true; }  else if(isset($_post['asdf'])){         $test = "asdf";     // validated true submit button submits if validated (script)     $validated = true; } else {     // make variables empty there's no values preserve         $test = ''; } if (!$validated) { echo $test; } ?> <form id="form" action="<?php echo $_server['php_self'] ?>" method="post"> <p>test: <input type="text" name="test" size="20" value="<?php echo $test ?>" /></p> <p><input type="submit" name="submit" value="submit" onclick ="validate(); return false;" /></p> <p><input type="submit" name="asdf" value="submit" onclick ="validate(document.getelementbyid('form')); return false;" /> </p>

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