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<?php trait A { protected static $_a; public static function setA($a) { static::$_a = $a; } public static function getA() { return static::$_a; } } class B { use A; public function __construct() { var_dump(static::$_a); } } A::setA('AAAA'); class C { use A; public function __construct() { var_dump(static::$_a); } } A::setA(null); class D { use A; public function __construct() { var_dump(static::$_a); } } new B; new C; new D;
Output for 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
Deprecated: Calling static trait method A::setA is deprecated, it should only be called on a class using the trait in /in/5uN3n on line 27 Deprecated: Accessing static trait property A::$_a is deprecated, it should only be accessed on a class using the trait in /in/5uN3n on line 8 Deprecated: Calling static trait method A::setA is deprecated, it should only be called on a class using the trait in /in/5uN3n on line 39 Deprecated: Accessing static trait property A::$_a is deprecated, it should only be accessed on a class using the trait in /in/5uN3n on line 8 NULL NULL NULL
Output for 5.4.0 - 5.4.45, 5.5.24 - 5.5.35, 5.6.7 - 5.6.28, 7.0.0 - 7.0.20, 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
NULL string(4) "AAAA" NULL
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29
Parse error: syntax error, unexpected T_STRING in /in/5uN3n on line 3
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/5uN3n on line 3
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/5uN3n on line 3
Process exited with code 255.
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