複数の送信ボタンがある PHP フォームでどのボタンがクリックされたかをどのように判断しますか?

How to Determine the Originating Button in a PHP Form Submission

When designing forms with multiple submit buttons, it becomes crucial to identify which button was clicked upon form submission. This section presents a comprehensive guide to assist developers in achieving this functionality.

Identifying the Submit Button

To differentiate between the submit buttons, PHP utilizes the following approach:

if ($_SERVER['REQUEST_METHOD'] === 'POST') {
    if (isset($_POST['btnDelete'])) {
        // btnDelete was clicked
    } else {
        // Default to the first submit button (btnSubmit)
    }
}

Consider Default Submit Button

It's essential to acknowledge that the first submit button appearing in the form HTML is considered the default submitter. This principle applies to both single and multi-button forms.

Example: Multi-Button Form

Assuming the following form markup:

<input type="submit" name="btnSubmit1" value="1">
<input type="submit" name="btnSubmit2" value="2">
<input type="submit" name="btnSubmit3" value="3">

PHP code would determine the clicked button as follows:

if (isset($_POST['btnSubmit3'])) {
    // btnSubmit3 was clicked
} elseif (isset($_POST['btnSubmit2'])) {
    // btnSubmit2 was clicked
} else {
    // Default to btnSubmit1 (first submit button)
}

GET Method Considerations

For forms using the GET method, employing $_SERVER['REQUEST_METHOD'] === 'GET' is unreliable. Instead, consider adding a hidden input named 'submitted' and setting its value to 1. This allows for submission detection via isset($_GET['submitted']).

Browser Compatibility

This approach enjoys excellent browser compatibility, extending support to browsers from the early 2000s and beyond. Its logical structure is easily adaptable to other languages.

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