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<?php function executeFns(Generator $fnProvider, $args = []) { $lastResult = 0; while ($fnProvider->valid()) { try { $fn = $fnProvider->current(); $lastResult = $fn($lastResult); $fnProvider->send($lastResult); } catch (Exception $e) { $fnProvider->throw($e); } } } $fns = [ function ($n) { return $n + 1; }, function ($n) { return $n + 2; }, function ($n) { return $n + 3; }, function ($n) { return $n + 4; }, function ($n) { throw new Exception('Throwin\' \'cepshuns, just cuz!'); } ]; function debuggingFnProvider(array $fns) { foreach ($fns as $fn) { try { $result = (yield $fn); echo "Result: {$result}\n"; } catch (Exception $e) { echo "Error: " . $e->getMessage() . "\n"; } } } executeFns(debuggingFnProvider($fns));
Output for 5.5.24 - 5.5.35, 5.6.8 - 5.6.28, 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 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
Result: 1 Result: 3 Result: 6 Result: 10 Error: Throwin' 'cepshuns, just cuz!
Output for 5.4.0 - 5.4.45
Parse error: syntax error, unexpected '$fn' (T_VARIABLE) in /in/c6CpN on line 29
Process exited with code 255.
Output for 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29
Parse error: syntax error, unexpected '[' in /in/c6CpN on line 3
Process exited with code 255.
Output for 5.0.0 - 5.0.5
Parse error: parse error, unexpected '[' in /in/c6CpN on line 3
Process exited with code 255.
Output for 4.4.2 - 4.4.9
Parse error: syntax error, unexpected T_STRING, expecting ')' in /in/c6CpN on line 3
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.3.11, 4.4.0 - 4.4.1
Parse error: parse error, unexpected T_STRING, expecting ')' in /in/c6CpN on line 3
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error, expecting `')'' in /in/c6CpN on line 3
Process exited with code 255.

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