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<?php function numbers() { $numbers = [1, 2, 3]; $letters = letters(); foreach($numbers as $number) { yield $number; yield $letters->current(); $letters->next(); } } function letters() { $letters = ['A', 'B', 'C']; foreach ($letters as $letter) { yield $letter; yield numbers(); } } foreach (numbers() as $x) { echo $x . PHP_EOL; }
Output for 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
1 A 2 Fatal error: Uncaught Error: Object of class Generator could not be converted to string in /in/eOg91:27 Stack trace: #0 {main} thrown in /in/eOg91 on line 27
Process exited with code 255.
Output for 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33
1 A 2 Recoverable fatal error: Object of class Generator could not be converted to string in /in/eOg91 on line 27
Process exited with code 255.
Output for 5.5.0 - 5.5.38, 5.6.0 - 5.6.40, 7.0.0 - 7.0.33
1 A 2 Catchable fatal error: Object of class Generator could not be converted to string in /in/eOg91 on line 27
Process exited with code 255.
Output for 5.4.0 - 5.4.45
Parse error: syntax error, unexpected '$number' (T_VARIABLE) in /in/eOg91 on line 9
Process exited with code 255.
Output for 4.4.2 - 4.4.9, 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/eOg91 on line 5
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, 5.0.0 - 5.0.5
Parse error: parse error, unexpected '[' in /in/eOg91 on line 5
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/eOg91 on line 5
Process exited with code 255.

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