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run code in 150+ php & hhvm versions
Bugs & Features
<?php function gen_one_to_three() { yield 1; yield '5' => 'hui'; yield 5; yield 6; } foreach(gen_one_to_three() as $k => $v) { echo $k, ' => ', $v, "\n"; } ?>
based on BIXqZ
Output for 5.5.24 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
0 => 1 5 => hui 1 => 5 2 => 6
Output for hhvm-3.10.0

Process exited with code 153.
Output for 5.4.0 - 5.4.45
Parse error: syntax error, unexpected '1' (T_LNUMBER) in /in/gcGKI on line 3
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_LNUMBER in /in/gcGKI on line 3
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_LNUMBER in /in/gcGKI on line 3
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/gcGKI on line 3
Process exited with code 255.