Why is my form validation not working? - php

Question

I'm having troubles validating my form. How do I validate the form using PHP? I've tried lots of different methods and nothing has worked. I can get the inputs to display (although check-box doesn't always display) but it just won't validate.
I also want to display the user's inputs (after it has been validated) onto another page, how do I do that?
Here is my code;
Form:
<form action="<?php $_SERVER['PHP_SELF'];?>" method="post">
<label for="name">Your Name:</label>
<input type="text" name="name" id="name" value="" required>
<br><br>
<label for="email">Your Email:</label>
<input type="text" name="email" id="email" value="" required>
<br>
<br>
<label for="subject">Subject:</label>
<input type="text" name="subject" id="subject" value="" required>
<br>
<br>
Recipient:
<div>
<label for="admin">
<input type="checkbox" name="recipient[]" id="admin" value="Administrator">
Administrator</label>
<br>
<label for="editor">
<input type="checkbox" name="recipient[]" id="editor" value="Content Editor">
Content Editor</label>
<br>
</div>
<br>
<label for="message">Message:</label>
<br>
<textarea name="message" id="message" cols="45" rows="5" required></textarea>
<input type="hidden" name="submitted" value="1">
<br>
<input type="submit" name="button" id="button" value="Send">
<br>
</form>
PHP:
<?php
$name = $_POST['name'];
$email = $_POST['email'];
$subject = $_POST['subject'];
$message = $_POST['message'];
if ($_POST['submitted']==1) {
if ($_POST['name']){
$name = $_POST['name'];
}
else{
echo "<p>Please enter a name.</p>" ;
}
if (preg_match("/^[_a-z0-9-]+(\.[_a-z0-9-]+)*#[a-z0-9-]+(\.[a-z0-9-]+)*(\.[a-z]{2,3})$/i", $email))
$email = $_POST['email'];
}
else{
echo "<p>Please enter a valid email.</p>";
}
if ($_POST['subject']){
$subject = $_POST['subject'];
}
else{
echo "<p>Please enter a subject.</p>";
if(empty($_POST['recipient'])){
echo "<p>Please select a recipient</p>";
}else{
for ($i=0; $i < count($_POST['recipient']);$i++) {
echo $_POST['recipient'][$i] . " ";
}
}
}
if ($_POST['message']){
$message = $_POST['message'];
}
/* go to form.php
display results
echo "<strong>Your Name:</strong> ".$name. "<br />";
echo "<strong>Your Email:</strong> ".$email. "<br />";
echo "<strong>Subject:</strong> ".$subject. "<br />";
echo "<strong>Recipient:</strong> ";
echo "<br />";
echo "<strong>Message:</strong> <br /> " .$message;
*/
?>

Answer 1

if (preg_match("/^[_a-z0-9-]+(.[_a-z0-9-]+)#[a-z0-9-]+(.[a-z0-9-]+)(.[a-z]{2,3})$/i", $email)
You can't use email in this condition because $email is empty!