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The biggest problem would be that the £ symbol is not on US keyboards. The # symbol takes its place, but is called the pound sign rather than hash.

That would be an advantage, not a problem. No-one wants vulgar yanks sullying a classy language like PHP.

Map $ to £ - problem solved!

If you do that, you must hit the $ key 1.6 times to get £ to appear, which is kind of a pain.

Good point.

How about you press $ eight times - that gives you five £s and then you hit backspace four times leaving you with one £.