PHP validation checkbox

Question

I\'ve scoured the entire internet trying to find a solution to what I\'m missing here (or doing wrong). My form doesn\'t validate even when the check box is checked. Everything

Answer 1

The problem with your current validation is that you're using if-else wrongly and that you're using exit on every statement which will terminate your script prematurely.

You can do this instead:

For Terms:
<input type="checkbox" class="form-check-input" name="terms" id="terms" value="1"/>    

//set an error counter to trigger the `exit`
$error_counter = 0;
if(trim($name) == '') {
    echo '<div class="error_message">Attention! You must enter your name</div>';
    $error_counter++;
} 
if(trim($email) == '') {
    echo '<div class="error_message">Attention! Please enter a valid email 
address.</div>';
    $error_counter++;
}
if(!isEmail($email)) {
    echo '<div class="error_message">Attention! You have entered an invalid e- 
mail address, try again.</div>';
    $error_counter++;
} 
if(trim($subject) == '') {
    echo '<div class="error_message">Attention! Please enter a subject.</div>';
    $error_counter++;
}
if(trim($comments) == '') {
    echo '<div class="error_message">Attention! Please enter your message.</div>';
    $error_counter++;
}
if(empty($terms)) {
    echo '<div class="error_message">Attention! Please agree to our terms of service.</div>';
    $error_counter++;
}
//if `$error_counter > 0 > 0` it will trigger the `exit()` to stop the script and display the errors.
if($error_counter > 0){
    exit();
}

There's a more beautiful approach to do this. Feel free to add suggestions for the OP.

Answer 2

You don't set any value attribute for your checkbox :

<input type="checkbox" class="form-check-input" name="terms" id="terms" value="yes" />

More informations : https://developer.mozilla.org/fr/docs/Web/HTML/Element/Input/checkbox

Answer 3

I can see your checkbox has no value so the PHP part is getting a garbage/empty value.

In short, just add a required attribute in your HTML side. No need of a check at the server end

<div class="form-check">
      <input type="checkbox" class="form-check-input" name="terms" id="terms" required/>
     <label class="form-check-label" for="terms"><p>I agree to terms of service.</p></label>
</div>