How can developers decide between using $_POST or $_GET method in PHP for data submission?

Developers can decide between using $_POST or $_GET method in PHP for data submission based on the sensitivity of the data being submitted. If the data contains sensitive information like passwords or personal details, it is recommended to use the $_POST method as it sends data in the HTTP request body, making it more secure. On the other hand, if the data is not sensitive and is simply used for retrieving information from the server, the $_GET method can be used.

// Example of using $_POST method for data submission
if ($_SERVER["REQUEST_METHOD"] == "POST") {
    $username = $_POST["username"];
    $password = $_POST["password"];
    
    // Process the submitted data
}
```

```php
// Example of using $_GET method for data submission
if ($_SERVER["REQUEST_METHOD"] == "GET") {
    $searchQuery = $_GET["query"];
    
    // Process the submitted data
}