html - Can you tell me what's wrong with this PHP form? -


i'm trying make simple website in ask user name , dob in order output "hello (name) (age) years old , graduate in (graduation date). feel code right when submit form leads me blank page.

my code: html

<body>   <center>     <form action="aform.php" method="post">       name:<input type="text" name="name" />       <br />       date of birth:       <input type="text" size="4" placeholder="mm" name="month" />        <input type="text" size="4" placeholder="dd" name="day" />       <input type="text" size="6" placeholder="yyyy" name="year" />       <input type="submit" name="submit" value="submit" />       <br />     </form>   </center> </body>

php:

<?php  if($_post["submit"]){      $name = $_post["name"];     $day = $_post["day"];     $month = $_post["month"];     $year = $_post["year"];     $datedisplay = date("yyyy");     $birth = array($day,$month,$year);      if($name = $year = $month = $day = ""){         echo "you must fill out everything!";     } else if($year = $month = $day > 0) {         $yourage = 2014 - $year;         $gradyear = $year + 22;         $graddate = "6/tba/$gradyear";          echo "hello" . $name . ", are" . $yourage . "years old , graduate college in" . $graddate ;      }    } ?>

sorry if presented wrong i'm new website.

your tests wrong. here corrected code: 

<?php  if($_post["submit"]) {      $name = $_post["name"];     $day = $_post["day"];     $month = $_post["month"];     $year = $_post["year"];     $datedisplay = date("yyyy");     $birth = array($day,$month,$year);      if(empty($name) || empty($year) || empty($month) || empty($day)) {         echo "you must fill out everything!";     } else if($year > 0 && $month > 0 && $day > 0) {         $yourage = 2014 - $year;         $gradyear = $year + 22;         $graddate = "6/tba/$gradyear";          echo "hello" . $name . ", are" . $yourage . "years old , graduate college in" . $graddate ;      }    } ?>

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