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run code in 150+ php & hhvm versions
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<?php function gen() { echo "1\n"; $ret = (yield 'yield1'); echo "2\n"; var_dump($ret); echo "3\n"; $ret = (yield 'yield2'); echo "4\n"; var_dump($ret); } $gen = gen(); var_dump($gen->current()); // string(6) "yield1" var_dump($gen->send('ret1')); // string(4) "ret1" (the first var_dump in gen) // string(6) "yield2" (the var_dump of the ->send() return value) var_dump($gen->send('ret2')); // string(4) "ret2" (again from within gen) // NULL (the return value of ->send())
Output for 5.5.24 - 5.6.28, 7.0.0 - 7.1.0
1 string(6) "yield1" 2 string(4) "ret1" 3 string(6) "yield2" 4 string(4) "ret2" NULL
Output for hhvm-3.12.0
1 string(6) "yield1" 2 string(4) "ret1" 3 NULL 4 string(4) "ret2" 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 ''yield1'' (T_CONSTANT_ENCAPSED_STRING) in /in/4hu4c on line 4
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_CONSTANT_ENCAPSED_STRING in /in/4hu4c on line 4
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_CONSTANT_ENCAPSED_STRING in /in/4hu4c on line 4
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/4hu4c on line 4
Process exited with code 255.