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switch with case 0 [message #182589] Sat, 17 August 2013 04:55 Go to previous message
Fiver is currently offline  Fiver
Messages: 35
Registered: July 2013
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Member
This example

switch ("foo") {
case 0:
echo "'foo' is 0\n";
break;
default:
echo "'foo' is not 0\n";
}

will print: 'foo' is 0.

I know how to avoid the problem, I'm just wondering what kind of
comparison is used that makes "foo" equal to 0? The manual mentions
"loose comparison", but this is even looser than usual.

By the way, the original code was meant to validate SORT_* arguments.
It's a little harder to spot here:

switch ($mode) {
case SORT_ASC:
case SORT_DESC:
case SORT_REGULAR:
case SORT_NUMERIC:
case SORT_STRING:
case SORT_LOCALE_STRING:
case SORT_NATURAL:
case SORT_FLAG_CASE:
break;
default:
throw new \InvalidArgumentException("invalid sort mode: $mode");
}

SORT_REGULAR is 0, so if the input is a string, this will break (literally).


regards,
5er
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