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run code in 300+ PHP versions simultaneously
<?php $fp = fopen('php://stdin', 'r'); $json = @json_encode(array('a' => 'foo', 'b' => $fp)); var_dump($json, json_last_error_msg());
Output for 5.5.0 - 5.5.38, 5.6.0 - 5.6.40, 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 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
bool(false) string(21) "Type is not supported"
Output for 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45
Fatal error: Call to undefined function json_last_error_msg() in /in/QohfG on line 4
Process exited with code 255.
Output for 4.3.2 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.0 - 5.1.6

Process exited with code 255.
Output for 4.3.0 - 4.3.1
preferences:
318.76 ms | 401 KiB | 457 Q