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  1. <?php
  2.  
  3. $foo = [];
  4. $bar = $foo['bar']; // нотис есть и это логично
  5. is_array($foo['bar']); // нотиса нет
Success #stdin #stdout #stderr 0s 82560KB
stdin
Standard input is empty
stdout
Standard output is empty
stderr
PHP Notice:  Undefined index: bar in /home/lVt6IY/prog.php on line 4
PHP Notice:  Undefined index: bar in /home/lVt6IY/prog.php on line 5