note 121263 added to function.filter-var

note that FILTER_VALIDATE_BOOLEAN tries to be smart, recognizing words like Yes, No, Off, On, both string and native types of true and false, and is not case-sensitive when validating strings. <?php $vals=array('on','On','ON','off','Off','OFF','yes','Yes','YES', 'no','No','NO',0,1,'0','1','true', 'True','TRUE','false','False','FALSE',true,false,'foo','bar'); foreach($vals as $val){ echo var_export($val,true).': '; var_dump(filter_var($val,FILTER_VALIDATE_BOOLEAN,FILTER_NULL_ON_FAILURE)); } ?> outputs: 'on': bool(true) 'On': bool(true) 'ON': bool(true) 'off': bool(false) 'Off': bool(false) 'OFF': bool(false) 'yes': bool(true) 'Yes': bool(true) 'YES': bool(true) 'no': bool(false) 'No': bool(false) 'NO': bool(false) 0: bool(false) 1: bool(true) '0': bool(false) '1': bool(true) 'true': bool(true) 'True': bool(true) 'TRUE': bool(true) 'false': bool(false) 'False': bool(false) 'FALSE': bool(false) true: bool(true) false: bool(false) 'foo': NULL 'bar': NULL ---- Server IP: 72.52.91.14 Probable Submitter: 88.91.161.58 ---- Manual Page -- http://php.net/manual/en/function.filter-var.php Edit -- https://master.php.net/note/edit/121263 Del: integrated -- https://master.php.net/note/delete/121263/integrated Del: useless -- https://master.php.net/note/delete/121263/useless Del: bad code -- https://master.php.net/note/delete/121263/bad+code Del: spam -- https://master.php.net/note/delete/121263/spam Del: non-english -- https://master.php.net/note/delete/121263/non-english Del: in docs -- https://master.php.net/note/delete/121263/in+docs Del: other reasons-- https://master.php.net/note/delete/121263 Reject -- https://master.php.net/note/reject/121263 Search -- https://master.php.net/manage/user-notes.php