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To elaborate on Jacques comment, PHP is a loosely typed language the does all sorts of type casting on the fly.  


You can try this for example, and you'll get a very different result than the one you got in your example, where php was working with a string type internally.


$v = 77;
echo $v . "\n";
echo $v[0] . "\n";
echo $v[1] . "\n";
echo "Done\n";
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