note 125888 added to language.variables.scope

i hadn't found info on this so i had to make some tests... inside a function, when globalling a variable that doesn't exist in the parent scope, it will set to null... i mean... <?php function f() { global $g; var_dump($g); // prints 'NULL' with no log message, means if $g is unset globally then here IS SET to NULL (*) var_dump($l); // prints 'NULL' and logs the 'undefined variable l' notice in this line // (*) notice until the variable $g IS SET to null here, isset($g) will still return false // because for isset() the var has to be set and not null (see doc for details)... // maybe the only way to find if a variable is actually unset is throught the log warnings } var_dump($g); // prints 'NULL' and logs the 'undefined variable g' in this line var_dump($g); // same as above but in this line, means the variable is still unset f(); ?> . knowing this could be useful in a case like mine... consider something like this... <?php //--- account.php --- $user = 'john doe'; //--- main.php --- function welcome() { global $user; echo "welcome $user"; // if $user is not set in parent scope it just prints "welcome " // the right way afaik if ( isset($user) ) echo "welcome $user"; } if ( login_ok() ) incude 'account.php'; welcome(); ?> ---- Server IP: 45.112.84.4 Probable Submitter: 45.112.85.247 (proxied: 200.120.135.218) ---- Manual Page -- http://php.net/manual/en/language.variables.scope.php Edit -- https://master.php.net/note/edit/125888 Del: integrated -- https://master.php.net/note/delete/125888/integrated Del: useless -- https://master.php.net/note/delete/125888/useless Del: bad code -- https://master.php.net/note/delete/125888/bad+code Del: spam -- https://master.php.net/note/delete/125888/spam Del: non-english -- https://master.php.net/note/delete/125888/non-english Del: in docs -- https://master.php.net/note/delete/125888/in+docs Del: other reasons-- https://master.php.net/note/delete/125888 Reject -- https://master.php.net/note/reject/125888 Search -- https://master.php.net/manage/user-notes.php