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<?php class Foo { public $bar; public $baz = null; } $foo = new Foo(); var_dump(isset($foo->bar), $foo->bar); var_dump(isset($foo->bar), $foo->baz); var_dump(isset($foo->bar), $foo->biz);
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.34, 8.2.0 - 8.2.30, 8.3.0 - 8.3.30, 8.4.1 - 8.4.18, 8.5.0 - 8.5.3
bool(false) NULL bool(false) NULL Warning: Undefined property: Foo::$biz in /in/VD5UQ on line 12 bool(false) NULL
Output for 5.5.0 - 5.5.35, 5.6.0 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.10, 7.2.0 - 7.2.33, 7.3.16 - 7.3.31, 7.4.0 - 7.4.33
bool(false) NULL bool(false) NULL Notice: Undefined property: Foo::$biz in /in/VD5UQ on line 12 bool(false) NULL
Output for 7.3.32 - 7.3.33
bool(false) NULL bool(false) NULL bool(false) NULL
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