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<?php function generator(array &$array) { foreach($array as $key => &$value) { yield $key => $value; } } $array = range(1, 10); foreach(generator($array) as &$value) { $value++; } var_dump($array);
based on ZL84S
Output for 7.0.0 - 7.1.0
Fatal error: Uncaught Exception: You can only iterate a generator by-reference if it declared that it yields by-reference in /in/WXhIs:12 Stack trace: #0 {main} thrown in /in/WXhIs on line 12
Process exited with code 255.
Output for 5.5.24 - 5.6.28
Fatal error: Uncaught exception 'Exception' with message 'You can only iterate a generator by-reference if it declared that it yields by-reference' in /in/WXhIs:12 Stack trace: #0 /in/WXhIs(12): unknown() #1 {main} thrown in /in/WXhIs on line 12
Process exited with code 255.
Output for 5.4.0 - 5.4.45
Parse error: syntax error, unexpected '$key' (T_VARIABLE) in /in/WXhIs on line 7
Process exited with code 255.
Output for 5.1.0 - 5.3.29
Parse error: syntax error, unexpected T_VARIABLE in /in/WXhIs on line 7
Process exited with code 255.
Output for 5.0.0 - 5.0.5
Parse error: parse error, unexpected T_ARRAY, expecting '&' or T_VARIABLE in /in/WXhIs on line 4
Process exited with code 255.
Output for 4.4.2 - 4.4.9
Parse error: syntax error, unexpected T_ARRAY, expecting ')' in /in/WXhIs on line 4
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.4.1
Parse error: parse error, unexpected T_ARRAY, expecting ')' in /in/WXhIs on line 4
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error, expecting `')'' in /in/WXhIs on line 4
Process exited with code 255.