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<?php function foo() { yield 1; yield 2; yield 3; yield 4; } $fooG = foo(); var_dump($fooG instanceof Traversable); array_walk($fooG, function ($foo) { var_dump($foo); }); iterator_apply($fooG, function ($foo) { var_dump($foo); });
Output for 8.2.0 - 8.2.20, 8.3.0 - 8.3.8
bool(true) Fatal error: Uncaught ArgumentCountError: Too few arguments to function {closure}(), 0 passed and exactly 1 expected in /in/n70qm:20 Stack trace: #0 [internal function]: {closure}() #1 /in/n70qm(20): iterator_apply(Object(Generator), Object(Closure)) #2 {main} thrown in /in/n70qm on line 20
Process exited with code 255.
Output for 7.1.0 - 7.1.25, 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 - 8.1.29
bool(true) Fatal error: Uncaught ArgumentCountError: Too few arguments to function {closure}(), 0 passed and exactly 1 expected in /in/n70qm:20 Stack trace: #0 [internal function]: {closure}() #1 /in/n70qm(22): iterator_apply(Object(Generator), Object(Closure)) #2 {main} thrown in /in/n70qm on line 20
Process exited with code 255.
Output for 5.5.0 - 5.5.35, 5.6.0 - 5.6.28, 7.0.0 - 7.0.20
bool(true) Warning: Missing argument 1 for {closure}() in /in/n70qm on line 20 Notice: Undefined variable: foo in /in/n70qm on line 21 NULL

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