What does the following code do? A link to something in the PHP manual would also be nice.
if ($_SERVER['SERVER_PORT'] <> 443) { doSomething(); } 
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6 Answers
Same as !=, "Not equal"
false <> true // operator will evaluate expression as true false != true // operator will evaluate expression as true Here is some reference: PHP Comparison Operators
answered Oct 30, 2008 at 4:59
Christian C. Salvadó
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It's another way of saying "not equal to" (the != operator). I think of it as the "less than or greater than" operator which really just means "not equal to".
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$_SERVER['SERVER_PORT'] gets the port used by the web server to serve HTTP requests. $_SERVER['SERVER_PORT'] <> 443 checks if the port is not equal to 443 (the default HTTPS port) and if not, invokes doSomething()
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Note that <> behaves as != even where < and > are not obvious comparison operators (eg $str1 <> $str2).
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PhiLho
Why < and > are not "obvious comparison operators" for strings?
eyelidlessness
What the hell do they compare? As far as I can tell, they compare the "value" (alphabetically, a < b) of the strings. I can't imagine a use case for that.
orokusaki
@PhiLho Strings are not often thought of as less than or greater than each other, unless you're comparing the length of the string. This is where most of the confusion arises.
PhiLho
@orokusaki: Really? I wonder how you sort strings then...
orokusaki
@PhiLho I'm speaking in respects to comparison operators, not sorting algorithms.
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Although PHP is mostly based on C-style syntax, this is one of the weird things that comes from the BASIC-style syntax world.
Needless to say, I'd just use != and be consistent with it, as <> is really never used.
