How can differences in PHP configurations between local development environments and web hosting servers impact the functionality of a PHP script?

Differences in PHP configurations between local development environments and web hosting servers can impact the functionality of a PHP script by causing errors or unexpected behavior. To address this issue, it's important to ensure that the PHP settings on both environments are compatible. This can be done by checking and adjusting settings such as PHP version, extensions, and error reporting levels.

// Check PHP version compatibility
if (version_compare(PHP_VERSION, '7.0.0') < 0) {
    die('PHP version 7.0.0 or higher is required');
}

// Check for required extensions
$required_extensions = ['mysqli', 'curl'];
foreach ($required_extensions as $extension) {
    if (!extension_loaded($extension)) {
        die('Required extension ' . $extension . ' is not loaded');
    }
}

// Set error reporting level
error_reporting(E_ALL);
ini_set('display_errors', 1);