How can I validate email in this PHP contact form? [duplicate]

Question

is there a way to validate an email in this form without rewriting it completely? It'd be great if I could just add something to this. I'm new to PHP and this form is taken from mmtuts video. If you know how to help, I'd be glad if you did.

<?php if (isset($_POST['submit'])) { $name = $_POST['name']; $number = $_POST['number']; $subject = $_POST['subject']; $mailFrom = $_POST['mail']; $message = $_POST['message']; $mailTo = "[email protected]"; $headers = "From: ".$mailFrom; $txt = "Pan/í ".$name." vám poslal/a zprávu. Telefonní číslo: ".$number."\n\n".$message; mail($mailTo, $subject, $txt, $headers); header("Location: index.php?mailsend"); }

Depending on how strictly you want to validate it there are a number of ways - the most basic is simply changing the html <input /> type from text to email and just letting the frontend deal with it (not recommended). On the server you can use PHP's filter_var() function with FILTER_VALIDATE_EMAIL (example) to test the format of the string, and/or do an MX lookup to ensure the domain has a valid mail exchange. Beyond that, you'd have to send the email. — CD001
– CD001, Commented Jan 2, 2020 at 15:35

PHPology · Accepted Answer · 2020-01-02 15:31:57Z

In the past I have used:

if(filter_var($email, FILTER_VALIDATE_EMAIL)) { //send email } else { //show error }

Source: https://www.php.net/manual/en/function.filter-var.php

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