Php is converted to ASCII and js is converted back.

Php is converted to ASCII, and js is being converted back, so there is a problem... I mainly want to do it. it is not a simple string in the middle, that is, if the data is captured during transmission, I do not know what the data is .. the character is displayed on the client... what I want now is to convert each character into ascii and send it to the client in php to convert it into ASCII. then JavaScript is being converted back, and a problem occurs...
I mainly want to do it. it is not a simple string in the middle, that is, if the data is captured during transmission, I do not know what the data is .. the character is displayed on the client...
What I want now is to convert each character into ascii and send it to the client. then js will convert all ascii characters back in a loop, but this will cause a problem similar to garbled code /... if you can use url encoding before converting to asciil, but the database is relatively large, it won't work when decodeURL on the js side ....
Well, by the way, does. js have a byte Array? I used the client to use as3 to encrypt the binary data for transmission ....
Thank you ..

------ Solution --------------------
Http://phpjs.org/functions/base64_decode/