Php filters special symbols regularly ◆●★

If it is these three kinds, there is no need to use regularization.

Just write it down and filter it.

If there are not only these three characters, then we must find out the range of these characters.

Every Chinese character has a code similar to 0x000000.

0x000000 ~ 0x000011If these ranges represent this pile of symbols, write this range instead of it.