Why is the input name not being outputted in the PHP file as expected?

The issue might be that the form input field does not have a name attribute or the name attribute is misspelled. To solve this issue, make sure that the input field in the HTML form has a correct name attribute that matches the one being used in the PHP file to retrieve the input value. 

<!DOCTYPE html>
<html>
<head>
    <title>Form Input</title>
</head>
<body>
    <form method="post" action="process_form.php">
        <label for="name">Name:</label>
        <input type="text" id="name" name="name">
        <input type="submit" value="Submit">
    </form>
</body>
</html>
```

In the PHP file (process_form.php):

```php
<?php
if ($_SERVER["REQUEST_METHOD"] == "POST") {
    $name = $_POST['name'];
    echo "Hello, $name!";
}
?>

Keywords

input name output PHP file error debugging

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