如何在PHP中判断指定name属性的POST表单是否提交

Got it, let's tackle this problem. When you've got multiple forms on a page, checking just for a common field like name won't cut it—since another form might have the same field name and trigger that check by accident. Here's a solid way to specifically detect when your post_name form is submitted:

Step 1: Add a unique hidden identifier to your target form #

Browsers don't send a form's own name attribute as part of the POST data, so we need to add a hidden input field inside the form to act as a unique marker. Update your HTML like this:

<form method='post' name='post_name' action='action.php'>
    <!-- Hidden field to identify this specific form -->
    <input type="hidden" name="form_identifier" value="post_name">
    <input name='name' />
    <!-- Add your submit button and other form elements here -->
    <button type="submit">Submit Form</button>
</form>

Step 2: Check for the identifier in your PHP code #

In action.php, you can now verify that the submission came specifically from your post_name form by checking for the hidden field's presence and value:

// Check if the post_name form was submitted
if (isset($_POST['form_identifier']) && $_POST['form_identifier'] === 'post_name') {
    // This block runs only when the post_name form is submitted
    echo "The post_name form has been submitted!";
    
    // You can still check for the 'name' field if needed
    if (isset($_POST['name'])) {
        $name = $_POST['name'];
        // Process the name value here
    }
}

Why this works #

The hidden field is unique to your post_name form, so even if other forms on the page have a name input, this identifier ensures you're only reacting to submissions from the correct form. It's a clean, reliable way to distinguish between multiple form submissions on the same page.

内容的提问来源于stack exchange，提问作者SenTisso