3v4l.org

run code in 300+ PHP versions simultaneously
<?php function gen(): Generator { yield fn($a) => 'b' => 'c'; } gen(); foreach(gen() as $key => $value) { var_dump($key, $value); }
based on sbeOf
Output for 7.4.0 - 7.4.16, 8.0.0 - 8.0.3
object(Closure)#3 (1) { ["parameter"]=> array(1) { ["$a"]=> string(10) "<required>" } } string(1) "c"
Output for 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.34, 7.3.0 - 7.3.27
Parse error: syntax error, unexpected '=>' (T_DOUBLE_ARROW) in /in/pLle7 on line 5
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, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.40
Parse error: syntax error, unexpected ':', expecting '{' in /in/pLle7 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, 5.0.0 - 5.0.5
Parse error: parse error, unexpected ':', expecting '{' in /in/pLle7 on line 3
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error, expecting `'{'' in /in/pLle7 on line 3
Process exited with code 255.