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run code in 300+ PHP versions simultaneously
<?php $a = new ArrayIterator(); $b = new CallbackFilterIterator($a, 'phpinfo'); echo $b;
Output for 8.0.0 - 8.0.12, 8.0.14 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
Fatal error: Uncaught TypeError: CallbackFilterIterator::__construct(): Argument #2 ($callback) must be a valid callback, function "phpinfo" not found or invalid function name in /in/8YEmC:4 Stack trace: #0 /in/8YEmC(4): CallbackFilterIterator->__construct(Object(ArrayIterator), 'phpinfo') #1 {main} thrown in /in/8YEmC on line 4
Process exited with code 255.
Output for 7.4.0 - 7.4.33, 8.0.13
Fatal error: Uncaught Error: Object of class CallbackFilterIterator could not be converted to string in /in/8YEmC:5 Stack trace: #0 {main} thrown in /in/8YEmC on line 5
Process exited with code 255.
Output for 7.1.0 - 7.1.25, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33
Recoverable fatal error: Object of class CallbackFilterIterator could not be converted to string in /in/8YEmC on line 5
Process exited with code 255.
Output for 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 CallbackFilterIterator could not be converted to string in /in/8YEmC on line 5
Process exited with code 255.
Output for 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29
Fatal error: Class 'CallbackFilterIterator' not found in /in/8YEmC on line 4
Process exited with code 255.
Output for 4.3.2 - 4.3.11, 4.4.0 - 4.4.9
Fatal error: Cannot instantiate non-existent class: arrayiterator in /in/8YEmC on line 3
Process exited with code 255.
Output for 4.3.0 - 4.3.1
Fatal error: Cannot instantiate non-existent class: arrayiterator in /in/8YEmC on line 3

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