array_shift : Only variables should be passed by reference error in php

[islamszv]

You must replace this line : $hexHash = array_shift(unpack('H*', $hash));
with those:
$keys = unpack('H*', $hash);
$hexHash = array_shift($keys);

[shaun-ba]

@islamszv Thanks for pointing this out, whilst this will work for some users we realise it will throw errors for others so we will change it.