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From what I know about PHP, the following syntax is not legal:
if ($s == Yes)
It should instead be written as:
if ($s == 'Yes')
However, the first example is working just fine. Anyone know why?
Ordinarily, it would be interpreted as a constant, but if PHP can’t find a constant by that name, then it assumes it to be a string literal despite the lack of quotes. This will generate an E_NOTICE message (which may not be visible, depending on your error reporting level); something like:
Basically, PHP is just overly lenient.