php - i have issue with POST, (im new and need help) -

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im following book tutorial , im stuck.

here html orderform (orderform.html)

<!doctype html> <html> <head>  </head>  <body> <form action='processorder.php' method="post"> <table border=0> <tr bgcolor=#cccccc> <td width=150>item</td> <td width=15>quantity</td> </tr> <tr> <td>tires</td> <td align=center><input type="text" name="tireqty" size=3 maxlength=3></td> </tr> <tr> <td>oil</td> <td align=center><input type="text" name="oilqty" size=3 maxlength=3></td> </tr> <tr> <td>spark plugs</td> <td align=center><input type="text" name="sparkqty" size=3 maxlength=3></td> </tr> <tr> <td colspan=2 align=center><input type=submit value="submit order"></td> </td> </table> </form>

here process order form (processorder.php)

    <!doctype html> <html> <head> <title>bobs auto parts - order results</title> </head>  <body> <h1>bob's auto parts</h1> <h2>order results</h2> <?php echo "<p>order processed @ "; echo date("1 js \of f y h:i:s: a"); echo "<br>";  echo "<p>your order follows:"; echo "<br>"; echo $tireqty." tires<br>"; echo $oilqty." bottles of oil<br>";  echo $sparkqty." spark plugs<br>";   var_dump($_post);

?>

when var_dump $_post on processorder.php says in array when try , echo variables gives me notice variables i'm trying carry on undifined. please :(

you must echo these : 

if (isset($_post['tireqty'])) {     echo $_post['tireqty']; } if (isset($_post['oilqty'])) {     echo $_post['oilqty']; } if (isset($_post['sparkqty'])) {     echo $_post['sparkqty']; }

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