PHP Checkbox code help

programming
1

I am having a hard time getting my php to work with my html. I have several sets of checkboxes and I believe that is what is not coded right. Can someone please help???

Here is the code in html and php for my checkboxes. Right now when I sumbit it sends me to a page that says “blarg!”

<form method="POST" action="mailer.php" ><p><strong>Was this contact (check all that apply)</strong></p>
            
  <label>
              <input name="contact" type="checkbox" value="In person" />
              In person</label>
          <br />
                <label>
              <input name="contact" type="checkbox" value="By phone" />
              By phone</label>
          <br />
                <label>
              <input name="contact" type="checkbox" value="By email" />
              By email</label>
          <br />
                <label>
              <input name="contact" type="checkbox" value="Fax" />
              Fax</label>
          <br />
                <label>
              <input name="contact" type="checkbox" value="No contact with the Financial Aid Office" />
              No contact with the Financial Aid Office</label>
          <br />
                <label>
              <input name="contact" type="checkbox" value="Other" />
              Other</label>
          <p><strong>What was the nature of your visit(s)? (check all the apply)</strong></strong><br />
            <label>
              <input name="nature" type="checkbox" value="Loan question/assistance" />
              Loan question/assistance</label>
              <br />
              <label>
              <input name="nature" type="checkbox" value="Scholarship question/assistance" />
              Scholarship question/assistance</label>
              <br />
              <label>
              <input name="nature" type="checkbox" value="Application/FAFSA assistance" />
              Application/FAFSA assistance</label>
              <br />
              <label>
              <input name="nature" type="checkbox" value="Debt load counseling" />
              Debt load counseling</label>
              <br />
              <label>
              <input name="nature" type="checkbox" value="HPSP question/counseling" />
              HPSP question/counseling</label>
              <br />
              <label>
              <input name="nature" type="checkbox" value="Special Circumstances Appeal" />
              Special Circumstances Appeal</label>
              <br />
              <label>
              <input name="nature" type="checkbox" value="No contact with the Financial Aid Office2" />
              No contact with the Financial Aid Office</label>
          </p> </form>

<?php
if(isset($_POST['submit'])) { 
$to = xxx@myemail.com; 
$subject = "Financial Aid Survey"; foreach($_POST['checkbox'] as $value) { 
$checkbox_msg .= "Checked: $contact
";} 
foreach($_POST['checkbox'] as $value) { 
$checkbox_msg .= "Checked: $nature
";} 
$body =Was this contact: $contact
 
What was the nature of your visit: $nature
; 

echo "Thank you! Your information has been submitted to $to!"; 
mail($to, $subject, $body); 
} else { 
echo "blarg!"; 
} 
?>

Thank you!