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<?php declare(strict_types=1); namespace App; use Generator; use CachingIterator; class Foo { static $i = 0; public function __toString() { echo "Foo::_toString called " . (self::$i + 1) . " times\n"; return "foo " . ((string) ++self::$i); } } $generator = /** * @return Generator<bool, bool> */ static function () { yield true => true; yield false => false; yield "foo" => new Foo(); yield "bar" => new Foo(); yield "baz" => new Foo(); }; $iterator = new CachingIterator($generator(), CachingIterator::FULL_CACHE | CachingIterator::CALL_TOSTRING); foreach ($iterator as $k => $v) { var_dump($k, $v); } foreach ($iterator->getCache() as $k => $v) { var_dump($k, $v); }
Output for 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 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 - 8.3.28, 8.4.1 - 8.4.14, 8.5.0
bool(true) bool(true) bool(false) bool(false) Foo::_toString called 1 times string(3) "foo" object(App\Foo)#6 (0) { } Foo::_toString called 2 times string(3) "bar" object(App\Foo)#7 (0) { } Foo::_toString called 3 times string(3) "baz" object(App\Foo)#8 (0) { } int(1) bool(true) int(0) bool(false) string(3) "foo" object(App\Foo)#6 (0) { } string(3) "bar" object(App\Foo)#7 (0) { } string(3) "baz" object(App\Foo)#8 (0) { }
Output for 8.4.15
/bin/php-8.4.15: /usr/lib/libm.so.6: version `GLIBC_2.38' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libm.so.6: version `GLIBC_2.35' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libc.so.6: version `GLIBC_2.34' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libc.so.6: version `GLIBC_2.38' not found (required by /bin/php-8.4.15)
Process exited with code 1.
Output for 5.5.0 - 5.5.38, 5.6.0 - 5.6.40
Warning: Unsupported declare 'strict_types' in /in/Uiv7q on line 3 bool(true) bool(true) bool(false) bool(false) Foo::_toString called 1 times string(3) "foo" object(App\Foo)#5 (0) { } Foo::_toString called 2 times string(3) "bar" object(App\Foo)#6 (0) { } Foo::_toString called 3 times string(3) "baz" object(App\Foo)#7 (0) { } int(1) bool(true) int(0) bool(false) string(3) "foo" object(App\Foo)#5 (0) { } string(3) "bar" object(App\Foo)#6 (0) { } string(3) "baz" object(App\Foo)#7 (0) { }
Output for 5.4.0 - 5.4.45
Warning: Unsupported declare 'strict_types' in /in/Uiv7q on line 3 Parse error: syntax error, unexpected 'true' (T_STRING) in /in/Uiv7q on line 26
Process exited with code 255.
Output for 5.3.0 - 5.3.29
Warning: Unsupported declare 'strict_types' in /in/Uiv7q on line 3 Parse error: syntax error, unexpected T_FUNCTION, expecting T_PAAMAYIM_NEKUDOTAYIM in /in/Uiv7q on line 25
Process exited with code 255.
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17
Parse error: syntax error, unexpected T_STRING in /in/Uiv7q on line 5
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.3.11, 4.4.0 - 4.4.1, 5.0.0 - 5.0.5
Parse error: parse error, unexpected T_STRING in /in/Uiv7q on line 5
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/Uiv7q on line 5
Process exited with code 255.

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