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<?php abstract class A { protected $a = 'AAA'; private $b = 'BBB'; public function printB() { echo $this->b.PHP_EOL; } } class B extends A { public function printB2() { echo $this->b.PHP_EOL; } public function printA() { echo $this->a.PHP_EOL; } } $obj = new B; $obj->printA(); $obj->printB(); $obj->printB2();
Output for 8.1.28, 8.2.15 - 8.2.18, 8.3.2 - 8.3.4, 8.3.6
AAA BBB Warning: Undefined property: B::$b in /in/gA92u on line 11
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 AAA BBB Warning: Undefined property: B::$b in /in/gA92u on line 11
Output for 5.2.6 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.31, 5.6.34 - 5.6.40, 7.0.0 - 7.0.4, 7.0.6 - 7.0.30, 7.0.32 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.3, 7.2.9 - 7.2.26, 7.3.0 - 7.3.13, 7.4.0 - 7.4.1
AAA BBB Notice: Undefined property: B::$b in /in/gA92u on line 11
Output for 5.6.32 - 5.6.33, 7.0.5, 7.0.31, 7.2.4 - 7.2.8

Process exited with code 137.
Output for 5.0.2 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.5
AAA BBB Notice: Undefined property: B::$b in /in/gA92u on line 11
Output for 5.0.0 - 5.0.1
Notice: Use of undefined constant PHP_EOL - assumed 'PHP_EOL' in /in/gA92u on line 12 AAAPHP_EOL Notice: Use of undefined constant PHP_EOL - assumed 'PHP_EOL' in /in/gA92u on line 7 BBBPHP_EOL Notice: Undefined property: B::$b in /in/gA92u on line 11 Notice: Use of undefined constant PHP_EOL - assumed 'PHP_EOL' in /in/gA92u on line 11 PHP_EOL
Output for 4.4.2 - 4.4.9
Parse error: syntax error, unexpected T_CLASS in /in/gA92u 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
Parse error: parse error, unexpected T_CLASS in /in/gA92u on line 3
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/gA92u on line 3
Process exited with code 255.
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185.52 ms | 401 KiB | 335 Q