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Posted by Lars Eighner on 05/10/06 17:43
In our last episode,
<1147270557.730422.186550@u72g2000cwu.googlegroups.com>,
the lovely and talented kenoli
broadcast on alt.php:
> Can someone help me interpret this snippet?
> printf("<p>The two arrays are %sidentical.</p>\n", $arr1 === $arr2 ? ''
>: 'not ');
> It is easy to see what it does. It compares two arrays and inserts
> either a space or a "not" space in the template string.
> The parts I don't understand are the "?" and the ":". I can find no
> documentation anywhere of the "?" and the ":".
This is a conditional operator, found in C, shell programming, perl, etc.
stuffa ? stuffb : stuffc
stuffa is evaluated (that may mean being executed)
if that returns a true value stuffb is done, but if the returned value is
false, stuffc is done.
In other words:
stuffa ? stuffb : stuffc
is a way of writing
if stuffa then stuffb else stuffc (punctuated according to your favorite
language)
> I have had trouble generally getting good documentation on printf() and
> sprintf().
You will often get better clues reading perl or C documentation where these
kinds of things come from.
--
Lars Eighner usenet@larseighner.com http://www.larseighner.com/
War on Terrorism: Bad News from the Sanity Front
"Tactical nuclear capabilities should be used against the bin Laden
camps in the desert of Afghanistan." -Thomas Woodrow,_Washington Times_
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