Call to undefined function testinput() line 48 - php

Question

<script>
function testinput(value) {
value = trim(value);
value = stripslashes(value);
value = htmlspecialchars(value);
}
</script>
<?php
$servername ="localhost";
$username = "k";
$password = "password";
$dbname = "password";
$connect1 = new mysqli($servername, $username, $password, $dbname);
if($connect1->connect_error) {
die("Connection failed: " . $connnect1->connect_error);
}
if (isset($_POST['btnreg'])) {
$klantVoornaam = $_POST["txtVoornaam"];
$klantAchternaam = $_POST["txtAchternaam"];
$klantMail = $_POST["txtEmail"];
$klantWachtwoord = $_POST["txtWw"];
(line48)$klantVoornaam = testinput($klantVoornaam);
$klantAchternaam = testinput($klantAchternaam);
$klantMail = testinput($klantMail);
$klantWachtwoord = testinput($klantWachtwoord);
$sql = "INSERT INTO `klanten` (KlantID, Voornaam, Achternaam, Wachtwoord, Email, Klantreg, KlantActief)
VALUES(NULL,'".$klantVoornaam."','".$klantAchternaam."', '".md5($klantWachtwoord)."','".$klantMail."',". regCode() ."','0')";
$qresult = mysql_query($sql);
if($connect1 ->query($qresult)){
echo "Registered successfully!";
echo "Voornaam: " . $klantVoornaam;
echo "Achternaam" . $klantAchternaam;
echo "E-mail" . $klantMail;
echo "Wachtwoord" . $klantWachtwoord;
}
}
?>
Basically says the function testinput() I made above is undefined but I doesn't seem to see the mistake in that.
The script is set in my body as is the rest, using testinput() to strip of any strange characters since it's a username.

Answer 1

You're defining testinput in javascript, you can't call it from PHP. Instead, you should define it in PHP:
<?php
function testinput($value) {
$value = trim($value);
$value = stripslashes($value);
$value = htmlspecialchars($value);
return $value;
}
// Rest of your PHP code
BTW: This function doesn't really test your input, it sanitizes it. You should probably give it a different name to better describe what it does.

Answer 2

Thx alot! Stupid mistake by me, the teacher told me to use these trim/strips so I thought I'd stick with it