how to check checkboxes whether they are empty or not
<p>I apologize if it is stupid question. I wanted to check whether one or more checkboxes are not empty, then can process the form and print interest text for email. </p>

<p><code>HTML/PHP</code></p>

<pre><code>&lt;p&gt;&lt;label for="commentsText"&gt;I am interested in:&lt;/label&gt;&lt;br/&gt;
&lt;input type="checkbox" name="interest[]" id="interest" value="1" class="required requiredField email" /&gt; 
    Exhibiting. Please send me more information&lt;br/&gt;
&lt;input type="checkbox" name="interest[]" id="interest" value="2" class="required requiredField email" /&gt; 
    Visiting. Please add me to your mailing list&lt;br/&gt;
&lt;input type="checkbox" name="interest[]" id="interest" value="3" class="required requiredField email" /&gt; 
    Speaking. Please send me more information&lt;br/&gt;
&lt;input type="checkbox" name="interest[]" id="interest" value="4" class="required requiredField email" /&gt; 
    Attending. Please send me more information&lt;br/&gt;

&lt;?php if($interestError != '') { ?&gt;
&lt;span class="error"&gt;&lt;?php echo $interestError; ?&gt;&lt;/span&gt;
&lt;?php } ?&gt;
&lt;/p&gt;
</code></pre>

<p><code>PHP</code></p>

<pre><code>$interest='';    
if(empty($_POST[$interest]))
{ 
    $interestError ='Please select the interests';
    $hasError = true;
}
else{
    $numberofInterest = count($interest);
    for ($i=0; $i &lt; $numberofInterest; $i++)
    {
        $numofInterest = $interest[i];
        echo $numofInterest . " ";
    }
}
</code></pre>

<p><strong>EDIT #2</strong></p>

<p>Thank you everybody for the help. I used print_r and saw all four are printed. The problem is now: if no error, send mail. It doesn't show all when I checked all checkboxes. Only displays '4'. Is there a way to display all including texts? </p>

<pre><code>if(!isset($hasError)) {

        $interest = $numofInterest ;

    $subject = 'I Have A Question to Ask from '.$name;
            $thanksubject = 'Thank you for the Form Submission';
            $body = "Name: $name \n\nEmail: $email \n\nInterest: $interest\n\nComments: $comments";
</code></pre>

<p><strong>*<em>EDIT #3</em>*</strong></p>

<p>OK I have solved that last one above. managed to send email with everything. </p>
