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<?php echo (isset($a)) ? 'a isset' : 'a is not set'; echo "\n"; echo ($a==0) ? 'a is false' : 'a is true'; echo "\n"; $b = null; echo (isset($b)) ? 'b isset' : 'b is not set'; echo "\n"; echo ($b==0) ? 'b is false' : 'b is true'; echo "\n";
Output for git.master, git.master_jit, rfc.property-hooks
a is not set Warning: Undefined variable $a in /in/EYUif on line 4 a is false b is not set b is false

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