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<?php function ping_pong() { for ($i = 1; $i <= 10; $i++) { if (($val = (yield $i)) !== null) { echo 'ping: ' . $val . PHP_EOL; } } } foreach (ping_pong() as $value) { echo 'pong: ' . $generator->send($value) . PHP_EOL; }
Output for git.master, git.master_jit, rfc.property-hooks
Warning: Undefined variable $generator in /in/mLoS1 on line 16 Fatal error: Uncaught Error: Call to a member function send() on null in /in/mLoS1:16 Stack trace: #0 {main} thrown in /in/mLoS1 on line 16
Process exited with code 255.

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