In my thinking this was a mistake in the development of PHP.
The name ("isset") should describe the function and not have the desciption be "is set AND is not null".
I tried this on PHP 5.0.5 and got: yes no But on PHP 4.3.5 I got: yes yes Apparently, PHP4 converts the the string 'aaaa' to zero and then returns the string character at that position within the string $foo, when $foo is not an array.
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