PHP表单数据检查提交按钮名称

Question

I have two forms on the same page, each with different fields and different submit button names.

<button type="submit" name="formOne">Submit form</button>
<button type="submit" name="formTwo">Submit form</button>

On my mailer.php page I would like to check which submit button has been clicked, and process the code accordingly.

The code I have so far works for a single form, as follows;

if ($_SERVER["REQUEST_METHOD"] == "POST" ) {
    // my form 1 data
    // do stuff
}

However I thought I coulld add an if/else to check which submit button was clicked, something like;

if ($_SERVER["REQUEST_METHOD"] == "POST" ) {
    if($_POST['formOne']){
        // form 1 data
        // my form 1 data
        // do stuff
    }
    if($_POST['formTwo']){
        // form 2 data
        // my form 2 data
        // do stuff
    }
}

This doesn't seem to work. The error I receive is;

Notice: Undefined index: formOnein ... line 7

How can I achieve this?

Answer 1

If you want, you can alternatively use hidden inputs. You can access hidden inputs from php just like a normal text input.

<form method="GET" action="https://postman-echo.com/get">
    <input type="hidden" name="form" value="one" />
    <button type="submit">Submit form</button>
</form>

</div>