PHP $_GET not giving me required result -

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i writing php code in adobe dreamweaver. code shown below. expecting code output 2 boxes, write something. , when click on submit button, expect see 2 separate things entered box concatenated. i'm not getting concatenation. in fact, nothing happens when click on submit. confused. code not should using dreamweaver for? relatively new php , not understand bits. suspicion dreamweaver not recognize "twofieldform.php". can please tell me how can overcome issue?

<!doctype html> <html> <head> </head> <body> <h1>form filler</h1>      <?php      function joined($s1, $s2) {         return array($s1.$s2, strlen($s1.$s2));     }      $first = $_get[fieldone];     $second = $_get[fieldtwo];     $answer = joined($first, $second);       echo "the concatenated string \"{$answer[0]}\"        , length \"{$answer[1]}\";     ?>      <form action = "twofieldform.php" method = "get">     field 1 : <input type = "text" name = "fieldone"/>     field 2 : <input type = "text" name = "fieldtwo"/>       <input type = "submit">     </form>   </body> </html> 

<!doctype html> <html> <head> </head> <body> <h1>form filler</h1>  <?php      function joined($s1, $s2) {         return array($s1.$s2, strlen($s1.$s2));     }      $first = $_get['fieldone'];     $second = $_get['fieldtwo'];     $answer = joined($first, $second);     echo "the concatenated string \"{$answer[0]}\"      , length \"{$answer[1]}\""; ?>  <form action="" method="get">     field 1 : <input type="text" name="fieldone"/>     field 2 : <input type="text" name="fieldtwo"/>     <input type="submit"> </form>  </body> </html>

explanation: have add quotes in $_get['']. remember indention please, when see people using adobe dreamweaver, code horrible... if refering same file, don't have use action="somewhat.php". leave empty. aswell have missed " after echo statement. work now. please start using ide won't have basic mistakes because ide show mistakes already...


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