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<?php $val=5; $alpha= function() use ($val) {return $val * $val;}; echo $alpha;
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 Closure could not be converted to string in /in/uDjuh:6 Stack trace: #0 {main} thrown in /in/uDjuh 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 Closure could not be converted to string in /in/uDjuh on line 6
Process exited with code 255.
Output for 5.4.2 - 5.4.45, 5.5.24 - 5.5.35, 5.6.7 - 5.6.28, 7.0.0 - 7.0.20
Catchable fatal error: Object of class Closure could not be converted to string in /in/uDjuh on line 6
Process exited with code 255.

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