pack() in php. Illegal hex digit warning

Question

i am having some problems using pack() in php

$currencypair = \"EUR/USD\";
$buy_sell = \"buy\";
$alert_device_token =array(\"a\",\"a\",\"b\");
$message = \"         


        

Answer 1

You must change

pack('H*', $someString)

To

strtr(rtrim(base64_encode(pack('H*', sprintf('%u', CRC32($someString))))