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<?php function gen() { $ret = (yield 'yield1'); var_dump($ret); $ret = (yield 'yield2'); var_dump($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 5.5.0 - 5.6.28, 7.0.0 - 7.1.0
string(6) "yield1" string(4) "ret1" string(6) "yield2" string(4) "ret2" NULL
Output for hhvm-3.12.0
string(6) "yield1" string(4) "ret1" NULL string(4) "ret2" NULL
Output for hhvm-3.10.0
Fatal error: Uncaught exception 'Exception' with message 'Need to call next() first' in /in/G7kGk:10 Stack trace: #0 /in/G7kGk(10): Generator->current() #1 {main}
Process exited with code 255.
Output for 5.4.0 - 5.4.45
Parse error: syntax error, unexpected ''yield1'' (T_CONSTANT_ENCAPSED_STRING) in /in/G7kGk 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_CONSTANT_ENCAPSED_STRING in /in/G7kGk 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_CONSTANT_ENCAPSED_STRING in /in/G7kGk on line 3
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/G7kGk on line 3
Process exited with code 255.