note 125119 added to language.constants

The documentation says, "You can access constants anywhere in your script without regard to scope", but it's worth keeping in mind that a const declaration must appear in the source file before the place where it's used. This doesn't work (using PHP 5.4): <?php foo(); const X = 1; function foo() { echo "Value of X: " . X; } ?> Result: "Value of X: X" But this works: <?php const X = 1; foo(); function foo() { echo "Value of X: " . X; } ?> Result: "Value of X: 1" This is potentially confusing because you can refer to a function that occurs later in your source file, but not a constant. Even though the const declaration is processed at compile time, it behaves a bit like it's being processed at run time. ---- Server IP: 45.112.84.4 Probable Submitter: 101.0.109.162 (proxied: 147.66.2.1) ---- Manual Page -- http://php.net/manual/en/language.constants.php Edit -- https://master.php.net/note/edit/125119 Del: integrated -- https://master.php.net/note/delete/125119/integrated Del: useless -- https://master.php.net/note/delete/125119/useless Del: bad code -- https://master.php.net/note/delete/125119/bad+code Del: spam -- https://master.php.net/note/delete/125119/spam Del: non-english -- https://master.php.net/note/delete/125119/non-english Del: in docs -- https://master.php.net/note/delete/125119/in+docs Del: other reasons-- https://master.php.net/note/delete/125119 Reject -- https://master.php.net/note/reject/125119 Search -- https://master.php.net/manage/user-notes.php