3v4l.org

run code in 300+ PHP versions simultaneously
<?php $bar = array(); function& foo() { yield $bar; return $bar; } $g = foo(); foreach($g as $val) { var_dump($val); $val[] = 42; } var_dump($bar); var_dump($g->getReturn());
Output for 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.19, 8.3.0 - 8.3.7
NULL array(0) { } NULL
Output for 5.5.0 - 5.5.38, 5.6.0 - 5.6.40
Fatal error: Generators cannot return values using "return" in /in/a0pNc on line 6
Process exited with code 255.
Output for 5.4.0 - 5.4.45
Parse error: syntax error, unexpected '$bar' (T_VARIABLE) in /in/a0pNc on line 5
Process exited with code 255.
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326.5 ms | 401 KiB | 378 Q