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<?php function &gen(array $array) { yield from $array; } $array = [1, 2, 3]; foreach (gen($array) as &$v) { $v += 1; } var_dump($array);
Output for 7.0.4 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.34, 7.3.0 - 7.3.31, 7.4.0 - 7.4.24, 8.0.0 - 8.0.11
Fatal error: Cannot use "yield from" inside a by-reference generator in /in/fZEH0 on line 4
Process exited with code 255.
Output for 7.0.0 - 7.0.3
array(3) { [0]=> int(1) [1]=> int(2) [2]=> int(3) }
Output for 5.5.0 - 5.5.38, 5.6.0 - 5.6.40
Parse error: syntax error, unexpected '$array' (T_VARIABLE) in /in/fZEH0 on line 4
Process exited with code 255.
Output for 5.4.0 - 5.4.45
Parse error: syntax error, unexpected 'from' (T_STRING) in /in/fZEH0 on line 4
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 T_STRING in /in/fZEH0 on line 4
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/fZEH0 on line 3
Process exited with code 255.
Output for 4.4.2 - 4.4.9
Parse error: syntax error, unexpected T_ARRAY, expecting ')' in /in/fZEH0 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_ARRAY, expecting ')' in /in/fZEH0 on line 3
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error, expecting `')'' in /in/fZEH0 on line 3
Process exited with code 255.

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