note 73558 added to function.constant

in reply to anonymous [quote] To check if a constant is boolean, use this instead: <?php if (TRACE === true) {} ?> Much quicker and cleaner than using defined() and constant() to check for a simple boolean. [/quote] is definitely nor cleaner (because it's still as wrong as using simply "if (TRACE)") nor quicker than " if (TRACE)" (one more comparison on a boolean value). This will generate PHP errors. The constant TRACE is NOT defined. error : PHP Notice: Use of undefined constant TRACE - assumed 'TRACE' in yourpath/test_constants.php on line 5 if you really want to be "clean" and as quick as possible, then there is a function : [code] function IsBooleanConstantAndTrue($constname) { // : Boolean $res=FALSE; if (defined($constname)) $res=(constant($constname)===TRUE); return($res); } // use : if (IsBooleanConstantAndTrue('TRACE')) echo "trace is really True<br>"; [/code] If you want, you can see a demonstration at http://www.fecj.org/extra/test_constants.php Regards ---- Server IP: 195.221.21.36 Probable Submitter: 82.243.20.181 ---- Manual Page -- http://www.php.net/manual/en/function.constant.php Edit -- https://master.php.net/note/edit/73558 Del: integrated -- https://master.php.net/note/delete/73558/integrated Del: useless -- https://master.php.net/note/delete/73558/useless Del: bad code -- https://master.php.net/note/delete/73558/bad+code Del: spam -- https://master.php.net/note/delete/73558/spam Del: non-english -- https://master.php.net/note/delete/73558/non-english Del: in docs -- https://master.php.net/note/delete/73558/in+docs Del: other reasons-- https://master.php.net/note/delete/73558 Reject -- https://master.php.net/note/reject/73558 Search -- https://master.php.net/manage/user-notes.php