What is the significance of checking for $_POST['send_x'] when using an image button to submit a form in PHP?

When using an image button to submit a form in PHP, it is important to check for the presence of the specific POST parameter associated with the button (e.g., $_POST['send_x']) to ensure that the form submission was triggered by clicking the image button. This is necessary because image buttons send additional parameters (such as send_x and send_y) along with the form data when clicked, and checking for these parameters helps differentiate the submission from other form submissions. 

if(isset($_POST['send_x'])) {
    // Form submission triggered by clicking the image button
    // Process the form data here
}

Keywords

$_POST image button form submission validation security

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