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<?php $a = function(){echo 'hi';}; var_dump($a); print_r($a); echo json_encode($a); echo json_decode($a);
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
object(Closure)#1 (0) { } Closure Object ( ) {} Fatal error: Uncaught TypeError: json_decode(): Argument #1 ($json) must be of type string, Closure given in /in/1Wdus:8 Stack trace: #0 /in/1Wdus(8): json_decode(Object(Closure)) #1 {main} thrown in /in/1Wdus on line 8
Process exited with code 255.
Output for 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.38, 7.0.0 - 7.0.33, 7.1.0 - 7.1.25, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33
object(Closure)#1 (0) { } Closure Object ( ) {} Warning: json_decode() expects parameter 1 to be string, object given in /in/1Wdus on line 8
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17
Parse error: syntax error, unexpected T_FUNCTION in /in/1Wdus on line 3
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, 5.0.0 - 5.0.5
Parse error: parse error, unexpected T_FUNCTION in /in/1Wdus on line 3
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/1Wdus on line 3
Process exited with code 255.

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