联系表单组复选框数组

Question

I have a contact form built with PHP and I had a radio option box (one click) and have changed it to a group check box, which means multiple boxes can be clicked.

However, only the last most click is sent through to my email and playing with the code has messed me up, I am not very clear with the php array code and multiple (({{

Here is the html code

    <label><input type="checkbox" name="addon" value="NONE" <?php if (isset($_POST['addon']) && $_POST['addon'] == 'NONE') echo 'checked="checked"'; ?> tabindex="4" />  None <br /></label>
    <label><input type="checkbox" name="addon" value="HKG" <?php if (isset($_POST['addon']) && $_POST['addon'] == 'HKG') echo 'checked="checked"'; ?> tabindex="5" />  Hong Kong <br /></label>
    ....
    <label><input type="checkbox" name="addon" value="Other Start City" <?php if (isset($_POST['trip']) && $_POST['addon'] == 'Other Start City') echo 'checked="checked"'; ?> tabindex="4" /> Other</label>

and here is the php code I have at the moment, but this only gives one answer.

    $Indhold .= "Tour Extension: ".$_POST['addon']."
";

I tried changing it to an array (as I followed the tutorial http://www.html-form-guide.com/php-form/php-form-checkbox.html) , but then only array was printed on the email.

I also want to include validation on that combi box, if possible. So they can't choose NONE and HKG, and must click at least one.

Answer 1

PHP only populates $_POST/GET with arrays if the name ends in [] (or [index]).

Use name="addon[]"

Arrays aren't strings, so you can't just concatenate them. You can use implode to convert the members of an array into a single string. You could also use a for loop to deal with them one by one.