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<?php class Test { } $test = (function ($i) { return $i + 1; })->bindTo('Test'); var_dump($test(2));
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
Fatal error: Uncaught TypeError: Closure::bindTo(): Argument #1 ($newThis) must be of type ?object, string given in /in/7mYEi:10 Stack trace: #0 /in/7mYEi(10): Closure->bindTo('Test') #1 {main} thrown in /in/7mYEi on line 10
Process exited with code 255.
Output for 7.0.0 - 7.0.20, 7.1.0 - 7.1.20, 7.2.0 - 7.2.33, 7.3.16 - 7.3.33, 7.4.0 - 7.4.33
Warning: Closure::bindTo() expects parameter 1 to be object, string given in /in/7mYEi on line 10 Fatal error: Uncaught Error: Function name must be a string in /in/7mYEi:12 Stack trace: #0 {main} thrown in /in/7mYEi on line 12
Process exited with code 255.
Output for 5.5.24 - 5.5.35, 5.6.8 - 5.6.28
Parse error: syntax error, unexpected '->' (T_OBJECT_OPERATOR) in /in/7mYEi on line 10
Process exited with code 255.

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