How can PHP version compatibility affect the implementation of certain functions or features?

PHP version compatibility can affect the implementation of certain functions or features because newer PHP versions may introduce new functions or deprecate older ones. To ensure compatibility across different PHP versions, developers can use version checks or alternative functions that work across multiple PHP versions.

// Check PHP version and use alternative function if needed
if (version_compare(PHP_VERSION, '7.0.0', '<')) {
    // Use alternative function for older PHP versions
    // Example: use mysql_connect() instead of mysqli_connect()
} else {
    // Use the standard function for newer PHP versions
    // Example: use mysqli_connect() for PHP 7+
}