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<?php class Foo { protected $_foo = 'foo'; public function isMatch() { var_dump($this->_foo); var_dump(self::_foo); } } class Bar extends Foo { protected $_foo = 'bar'; } $a = new Bar(); var_dump($a->isMatch());
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.4, 8.3.6
string(3) "bar" Fatal error: Uncaught Error: Undefined constant Foo::_foo in /in/VntMm:8 Stack trace: #0 /in/VntMm(17): Foo->isMatch() #1 {main} thrown in /in/VntMm on line 8
Process exited with code 255.
Output for 8.3.5
Warning: PHP Startup: Unable to load dynamic library 'sodium.so' (tried: /usr/lib/php/8.3.5/modules/sodium.so (libsodium.so.23: cannot open shared object file: No such file or directory), /usr/lib/php/8.3.5/modules/sodium.so.so (/usr/lib/php/8.3.5/modules/sodium.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0 string(3) "bar" Fatal error: Uncaught Error: Undefined constant Foo::_foo in /in/VntMm:8 Stack trace: #0 /in/VntMm(17): Foo->isMatch() #1 {main} thrown in /in/VntMm on line 8
Process exited with code 255.
Output for 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
string(3) "bar" Fatal error: Uncaught Error: Undefined class constant '_foo' in /in/VntMm:8 Stack trace: #0 /in/VntMm(17): Foo->isMatch() #1 {main} thrown in /in/VntMm on line 8
Process exited with code 255.
Output for 5.4.2 - 5.4.45, 5.5.24 - 5.5.35, 5.6.7 - 5.6.28
string(3) "bar" Fatal error: Undefined class constant '_foo' in /in/VntMm on line 8
Process exited with code 255.

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