php - Variable count is not set in array -

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i want $id increase 1 every time form submitted. should appended array $users.

why not working?

<?php $users = array(); $id = 0;  if(isset($_post["submit"])){     $id = $id + 1;     $users[] = $id; } echo "<pre>"; print_r($users); echo "</pre>"; ?> <form action="random.php">     buy ticket     <input type="submit" name="submit"> </form>

this because once php code stops executing value of $id , $users gone forever. http , php stateless. once page processed gone , never existed. if want persist state need use persistent data store sessions or database.

<?php     session_start();      if(isset($_post["submit"])){         if (!isset($_session['users'])) { $_session['users'] = 0 }         $_session['users']++;     }     echo "<pre>";         print_r($_session['users']);     echo "</pre>";   ?> <form action="random.php" method="post">     buy ticket     <input type="submit" name="submit"> </form>

n.b.: forms defaults when method isn't defined, therefore needs method="post" since working post variables.


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