[预定义常量](%E8%BF%87%E6%BB%A4%E5%99%A8%E5%87%BD%E6%95%B0/%E9%A2%84%E5%AE%9A%E4%B9%89%E5%B8%B8%E9%87%8F.md) [filter_has_var 存在指定变量](%E8%BF%87%E6%BB%A4%E5%99%A8%E5%87%BD%E6%95%B0/filter_has_var%E5%AD%98%E5%9C%A8%E6%8C%87%E5%AE%9A%E5%8F%98%E9%87%8F.md) [filter_var 过滤变量](%E8%BF%87%E6%BB%A4%E5%99%A8%E5%87%BD%E6%95%B0/filter_var%E8%BF%87%E6%BB%A4%E5%8F%98%E9%87%8F.md) [filter_var_array](%E8%BF%87%E6%BB%A4%E5%99%A8%E5%87%BD%E6%95%B0/filter_var_array.md) [filter_input_array 过滤外部变量](%E8%BF%87%E6%BB%A4%E5%99%A8%E5%87%BD%E6%95%B0/filter_input_array%E8%BF%87%E6%BB%A4%E5%A4%96%E9%83%A8%E5%8F%98%E9%87%8F.md) [filter_input](%E8%BF%87%E6%BB%A4%E5%99%A8%E5%87%BD%E6%95%B0/filter_input.md)