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run code in 150+ php & hhvm versions
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<?php $wig = false; function generate(&$wig) { foreach (array( "apples", "oranges", "pears") as $fruit) { if (!$wig) { $wig = true; yield $fruit; } else yield; } } foreach (generate($wig) as $k) var_dump($k); ?>
Output for 5.5.24 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
string(6) "apples" NULL NULL
Output for hhvm-3.10.0

Process exited with code 153.
Output for 5.4.0 - 5.4.45
Parse error: syntax error, unexpected '$fruit' (T_VARIABLE) in /in/9TS4M on line 9
Process exited with code 255.
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.3.29
Parse error: syntax error, unexpected T_VARIABLE in /in/9TS4M on line 9
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.4.1, 5.0.0 - 5.0.5
Parse error: parse error, unexpected T_VARIABLE in /in/9TS4M on line 9
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/9TS4M on line 9
Process exited with code 255.