code: public function getPrecompiledScriptWithExpression($expression, $socketAddress = null)
      {
          $expression = self::combineExpressionWithSocketAddress($expression, $socketAddress);
  
          return isset($this->precompiledScripts[$expression]) ? $this->precompiledScripts[$expression] : null;
      }
docs: @param string      $expression
  @param string|null $socketAddress
  
  @return string|null