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<?php class STon { private static $instance; protected static $item; public static function get() { if (static::$instance === null) { static::$instance = static::$item; } return static::$instance; } } class A extends STon { protected static $item = "A"; } class B extends STon { protected static $item = "B"; } var_dump(A::get(), A::get(), B::get(), B::get(), A::get(), A::get(), B::get(), B::get());
Output for 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
string(1) "A" string(1) "A" string(1) "A" string(1) "A" string(1) "A" string(1) "A" string(1) "A" string(1) "A"
Output for 7.0.0 - 7.0.20, 7.1.0 - 7.1.20, 7.2.0 - 7.2.33, 7.3.16 - 7.3.33
Fatal error: Uncaught Error: Cannot access property A::$instance in /in/ErX59:9 Stack trace: #0 /in/ErX59(20): STon::get() #1 {main} thrown in /in/ErX59 on line 9
Process exited with code 255.
Output for 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.36, 5.6.0 - 5.6.28
Fatal error: Cannot access property A::$instance in /in/ErX59 on line 9
Process exited with code 255.
Output for 5.1.0 - 5.1.6, 5.2.0 - 5.2.17
Parse error: syntax error, unexpected T_STATIC in /in/ErX59 on line 9
Process exited with code 255.
Output for 5.0.0 - 5.0.5
Parse error: parse error, unexpected T_STATIC in /in/ErX59 on line 9
Process exited with code 255.
Output for 4.4.2 - 4.4.9
Parse error: syntax error, unexpected T_STRING, expecting T_OLD_FUNCTION or T_FUNCTION or T_VAR or '}' in /in/ErX59 on line 4
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
Parse error: parse error, unexpected T_STRING, expecting T_OLD_FUNCTION or T_FUNCTION or T_VAR or '}' in /in/ErX59 on line 4
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error, expecting `T_OLD_FUNCTION' or `T_FUNCTION' or `T_VAR' or `'}'' in /in/ErX59 on line 4
Process exited with code 255.
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