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run code in 300+ PHP versions simultaneously
<?php class Test { function __toString() { return __FILE__; } } readfile(new Test);
Output for 5.2.0 - 5.2.17, 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 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
<?php class Test { function __toString() { return __FILE__; } } readfile(new Test);
Output for 5.0.0 - 5.0.5, 5.1.0 - 5.1.6
Warning: readfile() expects parameter 1 to be string, object given in /in/1Sg6k on line 9
Output for 4.3.2 - 4.3.11, 4.4.0 - 4.4.9
Notice: Object to string conversion in /in/1Sg6k on line 9 Warning: readfile(Object): failed to open stream: No such file or directory in /in/1Sg6k on line 9
Output for 4.3.0 - 4.3.1
Notice: Object to string conversion in /in/1Sg6k on line 9 Warning: readfile(Object) [http://www.php.net/function.readfile]: failed to create stream: No such file or directory in /in/1Sg6k on line 9

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