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Text Based PHP Config File

PHP
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enter image description here This is a very simple and basic code that writes config $values to a PHP file via form.

Please inspect and get a professional opinion of code before using on a internet facing server as this was written on a localhost server with no internet.

This simple HTML (could have .php extension) for the form looks like this:

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Config Update Form</title>
</head>
<body>
    <form action="process.php" method="post" name="edit_config" id="edit_config">
        <div class="container-fluid">
            <div class="row">
                <div class='col-md-3 form-group'>
                    <label class="control-label" for="uploadcare">Uploadcare API Key:</label>
                    <input name="uploadcare" type="text" required pattern="[a-zA-Z0-9-_@:/*$%&?!., ]{3,}" id="uploadcare" value="<?php echo $uploadcare;?>">
                    Enter your Uploadcare API key <small>(host images in cloud for <a href="https://qiksoft.com">free</a>)</small>
                </div>
                <div class='col-md-3 form-group'>
                    <label class="control-label" for="uploadcare2">Another Uploadcare API Key:</label>
                    <input name="uploadcare2" type="text" required pattern="[a-zA-Z0-9-_@:/*$%&?!., ]{3,}" id="uploadcare2" value="<?php echo $uploadcare2;?>">
                    Enter another Uploadcare API key <small>(host images in cloud for <a href="https://qiksoft.com">free</a>)</small>
                </div>
            </div>
            <div class="row">
                <div class='col-sm-6'>
                    <input type="submit" name="Submit" value="Save">
                </div>
            </div>
        </div>
    </form>
</body>
</html>

The process.php is:

<?php
// Include the config.php file to get the current values
require_once 'config.php';

// Function to sanitize and validate inputs
function sanitize($input) {
    $input = trim($input);
    $input = stripslashes($input);
    $input = htmlspecialchars($input);
    return $input;
}

if (isset($_POST["Submit"])) {
    $uploadcare = sanitize($_POST["uploadcare"]);
    $uploadcare2 = sanitize($_POST["uploadcare2"]);

    // Function to safely write to a file
    function writeConfig($key, $value) {
        $configFile = 'config.php';
        $configData = file_get_contents($configFile);
        $configData = preg_replace("/(\$" . $key . " = \")(.*?)(\";)/", "$1" . $value . "$3", $configData);
        file_put_contents($configFile, $configData);
    }

    writeConfig('uploadcare', $uploadcare);
    writeConfig('uploadcare2', $uploadcare2);

    header("Location: index.php");
    exit();
}
?>

Your config.php should look like this:

<?php
// Configuration settings for the form
$uploadcare = "your_uploadcare_api_key_here";
$uploadcare2 = "your_second_uploadcare_api_key_here";
?>
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