Are there any specific tools or scripts available to easily test PHP scripts for compatibility with PHP 5 and newer versions?

To easily test PHP scripts for compatibility with PHP 5 and newer versions, you can use tools like PHPCompatibility. This tool provides a set of sniffs for PHP_CodeSniffer that checks for PHP version compatibility. By running PHPCompatibility on your PHP scripts, you can quickly identify any potential compatibility issues and make the necessary changes to ensure compatibility with PHP 5 and newer versions.

composer require squizlabs/php_codesniffer
composer require phpcompatibility/php-compatibility
vendor/bin/phpcs --standard=PHPCompatibility --runtime-set testVersion 5.6 /path/to/your/php/scripts