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<?php function chain(...$iters) { foreach ($iters as $iter) { yield from $iter; } } $gen = (function() { yield 1; yield 2; yield 3; })(); $repeatedTwice = chain($gen, $gen); foreach ($repeatedTwice as $v) var_dump($v);
Output for 7.0.0 - 7.0.20, 7.1.0 - 7.1.20, 7.2.0 - 7.2.33, 7.3.16 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
int(1) int(2) int(3) Fatal error: Uncaught Error: Generator passed to yield from was aborted without proper return and is unable to continue in /in/42NSf:5 Stack trace: #0 /in/42NSf(11): chain(Object(Generator), Object(Generator)) #1 {main} thrown in /in/42NSf on line 5
Process exited with code 255.
Output for 5.6.7 - 5.6.28
Parse error: syntax error, unexpected '$iter' (T_VARIABLE) in /in/42NSf on line 5
Process exited with code 255.
Output for 5.4.2 - 5.4.45, 5.5.24 - 5.5.35
Parse error: syntax error, unexpected '.', expecting '&' or variable (T_VARIABLE) in /in/42NSf on line 3
Process exited with code 255.
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