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<?php class foo { private $a = 1; public function b() { print_r($this->$a); } } $f = new foo; $f->b();
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
Warning: Undefined variable $a in /in/LiBiS on line 9 Warning: Undefined property: foo::$ in /in/LiBiS on line 9
Output for 7.1.0 - 7.1.20, 7.2.0 - 7.2.33, 7.3.12 - 7.3.31, 7.4.0 - 7.4.33
Notice: Undefined variable: a in /in/LiBiS on line 9 Notice: Undefined property: foo::$ in /in/LiBiS on line 9
Output for 7.3.32 - 7.3.33
Output for 7.0.0 - 7.0.20
Notice: Undefined variable: a in /in/LiBiS on line 9 Fatal error: Uncaught Error: Cannot access empty property in /in/LiBiS:9 Stack trace: #0 /in/LiBiS(14): foo->b() #1 {main} thrown in /in/LiBiS on line 9
Process exited with code 255.
Output for 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.24 - 5.5.35, 5.6.7 - 5.6.28
Notice: Undefined variable: a in /in/LiBiS on line 9 Fatal error: Cannot access empty property in /in/LiBiS on line 9
Process exited with code 255.
Output for 5.0.4
Notice: Undefined variable: a in /in/LiBiS on line 9 Notice: Undefined property: foo::$ in /in/LiBiS on line 9
Output for 5.0.0 - 5.0.3
Notice: Undefined variable: a in /in/LiBiS on line 9 Notice: Undefined property: foo::$ in /in/LiBiS on line 9
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/LiBiS on line 5
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/LiBiS on line 5
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/LiBiS on line 5
Process exited with code 255.

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