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<?php class Foo{} $foo = new Foo(); var_dump((string) $foo);
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 Foo could not be converted to string in /in/elBRV:6 Stack trace: #0 {main} thrown in /in/elBRV on line 6
Process exited with code 255.
Output for 7.1.0 - 7.1.20, 7.2.0 - 7.2.33, 7.3.16 - 7.3.33
Recoverable fatal error: Object of class Foo could not be converted to string in /in/elBRV 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 Foo could not be converted to string in /in/elBRV on line 6
Process exited with code 255.
Output for 5.0.0 - 5.0.5, 5.1.0 - 5.1.6
string(12) "Object id #1"
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9
Notice: Object to string conversion in /in/elBRV on line 6 string(6) "Object"

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