What are common reasons for the $_POST variable not working in PHP, especially when moving from a local environment to a server?

One common reason for the $_POST variable not working in PHP when moving from a local environment to a server is the server configuration. Make sure that the server is configured to allow POST requests and that the PHP settings are properly configured. Additionally, check for any errors in the form submission or data processing code that could be preventing the $_POST variable from being populated correctly. 

<form method="post" action="process_form.php">
    <input type="text" name="username">
    <input type="password" name="password">
    <button type="submit">Submit</button>
</form>
```

```php
<?php
if ($_SERVER["REQUEST_METHOD"] == "POST") {
    $username = $_POST['username'];
    $password = $_POST['password'];
    
    // Process the form data
}
?>

Keywords

$_POST variable PHP server local environment data transfer

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