code: public static function checkPhpVersion()
      {
          $version = null;
  
          if (\defined('PHP_VERSION')) {
              $version = PHP_VERSION;
          } else {
              $version = phpversion('');
          }
  
          //Case management system of ubuntu, php version return 5.2.4-2ubuntu5.2
          if (strpos($version, '-') !== false) {
              $version = substr($version, 0, strpos($version, '-'));
          }
  
          return $version;
      }
docs: Identify the version of php
  
  @return string