[PHP-DEV] Negative string offset support

[Ilia Alshanetsky]

I am wondering what are people's opinions on adding support for negative 
string offsets that could be used to access data from the end of a string.

Ex. $a = "123"; echo $a[-1]; // would print 3
I don't think we should do this for arrays, since -1 and similar are 
valid array keys, which means adding this support for arrays would break BC.

Ilia
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