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<?php class Hoge { const CONST_FOO = 'foo'; public function __construct() { // 定数が存在する場合 print constant('self::CONST_FOO') . PHP_EOL; // PHP8以降では定数が存在しない場合は例外が送出される try { print constant('self::NOT_EXIST'); } catch (Error $e) { print $e->getMessage(); print $e->getTraceAsString(); } } } $obj = new Hoge();
Output for git.master, git.master_jit, rfc.property-hooks
foo Undefined constant self::NOT_EXIST#0 /in/tbFJR(14): constant('self::NOT_EXIST') #1 /in/tbFJR(22): Hoge->__construct() #2 {main}

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