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<?php function gen_one_to_three() { for ($i = 1; $i <= 3; $i++) { yield $i; echo $a; } } $generator = gen_one_to_three(); foreach ($generator as $value) { var_dump($value); }
Output for git.master, git.master_jit, rfc.property-hooks
int(1) Warning: Undefined variable $a in /in/E5W2J on line 7 int(2) Warning: Undefined variable $a in /in/E5W2J on line 7 int(3) Warning: Undefined variable $a in /in/E5W2J on line 7

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