BroGad
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Why at the beginning keeps saying undefined index with a session variable Hello. I want to calculate the average age of the people that submit the form. So I got 2 counters (I apologize for my english). One that stores the addition of the age and the other one that stores the number of people that submit the form. Then I need to calculate the average.Everytime I load the page for the first time it says "undefined index conted" and "undefined index contper". But it does what I want: it shows the correct addition of the age and the counting of the people that submit the form. The error appears only when I load the page the first time. Then everything goes well. Also I wanted to know how to delete those values stored in the session variables with a button, so when I hit the button displays the average and stops counting. (I apologize for my english) Thanks. This is my code: <?php session_start(); if(isset($_POST['btn1'])) { $_SESSION['conted'] = $_SESSION['conted'] + $_REQUEST['ed']; $_SESSION['contper'] = $_SESSION['contper'] + 1; echo "El contador de edad va en " . $_SESSION['conted']; echo '<br>'; echo "El contador de personas va en " . $_SESSION['contper']; } ?> <!DOCTYPE html> <html> <head> <meta charset="utf-8" > <title>Encuesta</title> </head> <body> <form action="encuesta.php" method="post"> <table> <tr> <td>Nombre</td><td><input type="text" placeholder="Nombre" name="nom"></td> </tr> <tr> <td>Apellido</td><td><input type="text" placeholder="Apellido" name="ape"></td> </tr> <tr> <td>Edad</td><td><input type="text" placeholder="Edad" name="ed"></td> </tr> <tr> <td>Dirección</td><td><input type="text" placeholder="Dirección" name="dir"></td> </tr> <tr> <td>Barrio</td><td><input type="text" placeholder="Barrio" name="bar"></td> </tr> <tr> <td>Teléfono</td><td><input type="text" placeholder="Teléfono" name="tel"></td> </tr> <tr> <td colspan = 2 align="center"><input type="submit" value="Procesar" name="btn1"></td> </tr> <tr> <td colspan = 2 align="center"><input type="submit" value="Terminar" name="btn2"></td> </tr> </table> </form> </body> </html>