Check tax code (fiscal code) when insert a user

Hi all,

i'm new to cakephp and i use the 3 version. I'm lovin' it!!! :-)

I try to check the fiscal code (i'm italian and in my country the fiscal code = tax code is the unique id for all person) because i need to check if the user exist and don't insert duplicate.

I'm going crazy to do that beacuse isn't a function do this.

Help me please!!!

thanks in advantages for all reply.

PS: sorry for my bad english :-)

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