code: private function phpSizeToBytes($size){  
  		if (is_numeric( $size)){
  			return $size;
  		}
  		$suffix = substr($size, -1);
  		$value = substr($size, 0, -1);
  		switch(strtolower($suffix)){
              /** @noinspection PhpMissingBreakStatementInspection */
              case 'p':
  				$value *= 1024;
              /** @noinspection PhpMissingBreakStatementInspection */
              case 't':
  				$value *= 1024;
              /** @noinspection PhpMissingBreakStatementInspection */
              case 'g':
  				$value *= 1024;
              /** @noinspection PhpMissingBreakStatementInspection */
              case 'm':
  				$value *= 1024;
  			case 'k':
  				$value *= 1024;
  				break;
  		}
  		return $value;  
  	}
docs: Php size format to bytes
  
  @param string $size - php size format
  @return int - file size in bytes