PHP - checkbox value display in E-mail responder - php

Question

I have checked all the questions first. But non of them helped to solve my problem.
I have PHP E-mail responder connected to HTML contact form. I need to display selected checkbox value inside the email responder which is sent to customer.
PHP code
<?php
if(isset($_POST) && ($_POST['send'] == 1)){
$documents = array(
'document1' => 'http://www.example.com/document1.doc',
'document2' => 'http://www.example.com/document2.doc',
'document3' => 'http://www.example.com/document3.doc'
'document4' => 'http://www.example.com/document4.doc'
);
$to = 'lubosmasura#gmail.com';
$subject = 'Prihláška na školenie';
$name = $_POST['name'];
$email = $_POST['email'];
$document = implode(", ",$post['document']);
if(isset($_POST['document']) && count($_POST['document']) > 0){
foreach($_POST['document'] as $doc){
if(isset($documents[$doc])){
$document = implode(", ",$post['document']);
$message = "
ŠKOLENIE: $document
";
}
}
}
$headers = 'From: noreply#marcelaskolenia.sk' . "\r\n" .
'Reply-To: noreply#marcelaskolenia.sk' . "\r\n" .
'X-Mailer: PHP/' . phpversion();
$headers = 'MIME-Version: 1.0' . "\r\n";
$headers .= 'Content-type: text/html; charset=iso-8859-1' . "\r\n";
mail($to, $subject, $message, $headers);
}
?>
HTML code
<form method="post" action="test.php">
<p class="center">Vyberte školenie</p>
<label class="container riadok"><p for="document" class="dolava">§20 Poučená osoba</p>
<input type="checkbox" name="document[]" value="document1" id="document">
<span class="checkmark"></span>
</label>
<label class="container riadok"><p for="document" class="dolava">Aktualizácia: §21 AŽ §24</p>
<input type="checkbox" name="document[]" value="document2" id="document">
<span class="checkmark"></span>
</label>
<label class="container riadok"><p for="document" class="dolava">§21 Elektrotechnik</p>
<input type="checkbox" name="document[]" value="document3" id="document">
<span class="checkmark"></span>
</label>
<label class="container riadok"><p for="document" class="dolava">§24 Revízny technik</p>
<input type="checkbox" name="document[]" value="document4" id="document">
<span class="checkmark"></span>
</label>
<p class="center">Vyplňte osobné údaje</p>
<input type="text" name="name" id="name" class="form-control" placeholder="Meno">
<input type="text" name="email" id="email" class="form-control" placeholder="Email">
<input type="tel" name="phone" id="phone" class="form-control" placeholder="Telefónne číslo" pattern="[0-9]+" title="Zadajte iba čísla." required="required">
<input type="hidden" name="send" value="1" />
<button type="submit" value="SEND" id="submit" class="btn btn-primary"> ODOSLAŤ PRIHLÁŠKU</button>
Email responder works but it does not display selected checkbox value from HTML form behaind message ŠKOLENIE: CHECKBOX HERE
Any ideas? Thank you

Answer 1

Should be
if(isset($_POST['document']) && count($_POST['document']) > 0) {
foreach($_POST['document'] as $doc){
if(isset($documents[$doc])){
$document = implode(", ",$_POST['document']);
$message = "
ŠKOLENIE: $document
";
}
}
}

Answer 2

You don't have such a variable as $post, but you try to use it twice. Replace it with $_POST and your form will work.
This:
$document = implode(", ",$post['document']);
Replace with this:
$document = implode(", ",$_POST['document']);
And it should work.
Some hints:
Properly configured IDE will let you know about such errors as an undeclared variable. Use PHPStorm (commercial) or VSCode (free).
Don't close php tag (?>) at the end of your file (PSR2):
The closing ?> tag MUST be omitted from files containing only PHP.
Don't use the same identifier (id) multiple times. The id should be unique in the entire HTML document.
Edit: // As someone has mentioned in the comments, you don't have a closing tag for <form> tag, but I assumed that you pasted only a part of your HTML document. Otherwise, you should correct that as well.