How to numerically validate a php form ?
Question
I am trying to set up form validation for a project app. I keep getting the error that I am calling to an undefined function, but I'm not what I am doing wrong. From what I have learned and found online, this is the right syntax. Basically I only want the ticket number and spot number values to accept numbers as their input, and an error message to appear prompting the user to input a numeric value. This is my code so far:
<html>
<?php
if(!is_number($_POST['tick_num'])) {
echo "please enter a number";
}
$searchBy = $_POST['field'];
$searchFor = $_POST['term'];
$database = 'jy6536';
$db = mysqli_connect('', 'jy6536', '1km4bjRi', $database);
$record = "SELECT * FROM keyfob WHERE $searchBy LIKE '%".$searchFor."%'";
$result = mysqli_query($db, $record);
while($myrow = mysqli_fetch_array($result))
{
echo "<br><br>First Name: ".$myrow['last_name'];
echo "<br> Last Name: ".$myrow['first_name'];
echo "<br> Ticket Number ".$myrow['tick_num'];
echo "<br> Make: ".$myrow['make'];
echo "<br> Spot Number: ".$myrow['spot_num'];
}
?>
<br><br><a href="viewdb.php">Return to Table </a>
<br><a href="search.html">Return to Search </a>
</html>
1 answers
solution1
0 2017-07-27 03:58:40
http://php.net/manual/en/function.is-numeric.php
if(!is_numeric($_POST['tick_num'])) {
echo "please enter a number";
}
Do you want to allow ticket numbers like "+0123.45e6" and "9.1"? Maybe http://php.net/manual/en/function.ctype-digit.php would be better?
You could use this code instead:
$ticketNumber = $_POST['tick_num'];
if(!ctype_digit((string)$ticketNumber)) {
echo "please enter a number";
}
This will only accept integers, ss values like 9.1 or +0123.45e6 won't be accepted.
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