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run code in 300+ PHP versions simultaneously
<?php var_dump(json_encode(array("\xB1\x31"))); echo json_last_error();
Output for 5.5.0 - 5.5.38, 5.6.0 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.20, 7.2.0 - 7.2.33, 7.3.12 - 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) 5
Output for 5.3.1 - 5.3.13, 5.3.15 - 5.3.29, 5.4.0 - 5.4.45
string(6) "[null]" 5
Output for 5.3.14
Warning: json_encode(): Invalid UTF-8 sequence in argument in /in/9Rgir on line 3 bool(false) 5
Output for 5.3.0
string(6) "[null]" 0
Output for 5.2.7 - 5.2.17
string(6) "[null]" Fatal error: Call to undefined function json_last_error() in /in/9Rgir on line 4
Process exited with code 255.
Output for 5.2.0 - 5.2.6
string(4) "[""]" Fatal error: Call to undefined function json_last_error() in /in/9Rgir on line 4
Process exited with code 255.
Output for 5.0.0 - 5.0.5, 5.1.0 - 5.1.6
Fatal error: Call to undefined function json_encode() in /in/9Rgir on line 3
Process exited with code 255.
Output for 4.4.5 - 4.4.9
Fatal error: Call to undefined function: json_encode() in /in/9Rgir on line 3
Process exited with code 255.
Output for 4.3.2 - 4.3.11, 4.4.0 - 4.4.4
Fatal error: Call to undefined function: json_encode() in /in/9Rgir on line 3
Process exited with code 255.
Output for 4.3.0 - 4.3.1
Fatal error: Call to undefined function: json_encode() in /in/9Rgir on line 3

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