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<?php function emptyGenerator(): Generator { var_dump('Generator function started'); if (false) { yield 'some value'; } var_dump('Generator function finished'); } $generator = emptyGenerator(); var_dump('About to call $generator->valid()'); if ($generator->valid()) { var_dump('Generator is not empty, traversing'); foreach ($generator as $value) { var_dump('Generator yielded '.$value); } var_dump('Finished traversing generator'); } else { var_dump('Generator is empty'); }
Output for 7.2.0 - 7.2.34, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.25, 8.4.1 - 8.4.12
string(33) "About to call $generator->valid()" string(26) "Generator function started" string(27) "Generator function finished" string(18) "Generator is empty"
preferences:
95.15 ms | 407 KiB | 5 Q