<?php $a=''; if (!$a) print "a=[$a]"; if (empty($a)) print "empty(a)=[$a]"; $a=0; if (!$a) print "a=[$a]"; if (empty($a)) print "empty(a)=[$a]"; $a=null; if (!$a) print "a=[$a]"; if (empty($a)) print "empty(a)=[$a]";
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