note 124362 deleted from language.operators.comparison by crell

Note Submitter: azz ---- Keep in mind that ?: operator is NOT fully equal to empty() ?: can't check non-existent array index (as describe here https://www.php.net/manual/ru/language.operators.comparison.php#92685) and vars Check this: <?php ini_set('error_reporting', E_ALL); $t = []; var_dump(!isset($t['z']) || $t['z'] == FALSE); // true, this that empty() do var_dump(empty($t['z'])); // true var_dump(isset($t['z'])); // false $v1 = $t['z'] ?: false; // Notice: Undefined index: z $v2 = $t['z'] ?? false; // silent! var_dump($v1); // false var_dump($v2); // false var_dump(!isset($non_existent_var) || $non_existent_var == FALSE); // true, this that empty() do var_dump(empty($non_existent_var)); // true var_dump(isset($non_existent_var)); // false $v1 = $non_existent_var ?: false; // Notice: Undefined variable: non_existent_var $v2 = $non_existent_var ?? false; // silent! var_dump($v1); // false var_dump($v2); // false