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<?php $x = new stdClass(); $x->foo = new stdClass(); $x->foo->bar = 'baz'; var_dump("abc.$x->foo->bar.def");
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
Fatal error: Uncaught Error: Object of class stdClass could not be converted to string in /in/VG1K8:6 Stack trace: #0 {main} thrown in /in/VG1K8 on line 6
Process exited with code 255.
Output for 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33
Recoverable fatal error: Object of class stdClass could not be converted to string in /in/VG1K8 on line 6
Process exited with code 255.
Output for 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.24 - 5.5.35, 5.6.8 - 5.6.28, 7.0.0 - 7.0.20
Catchable fatal error: Object of class stdClass could not be converted to string in /in/VG1K8 on line 6
Process exited with code 255.
Output for 5.0.0 - 5.0.5, 5.1.0 - 5.1.6
string(25) "abc.Object id #2->bar.def"
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9
string(19) "abc.Object->bar.def"

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