3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php function isJson($string) { json_decode($string); return (json_last_error() == JSON_ERROR_NONE); // return json_last_error(); // == JSON_ERROR_NONE); } $str1 = '{ "firstName": "Bidhan", "lastName": "Chatterjee", "age": 40, "email":"bidhan@example.com" }'; //echo json_decode($str1); $x=isJson($str1); echo $x; ?>
Output for 5.3.0 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
1
Output for hhvm-3.10.0

Process exited with code 153.
Output for 5.2.0 - 5.2.17
Fatal error: Call to undefined function json_last_error() in /in/VaQJW on line 5
Process exited with code 255.
Output for 5.0.0 - 5.1.6
Fatal error: Call to undefined function json_decode() in /in/VaQJW on line 4
Process exited with code 255.
Output for 4.4.5 - 4.4.9
Fatal error: Call to undefined function: json_decode() in /in/VaQJW on line 4
Process exited with code 255.
Output for 4.3.2 - 4.4.4
Fatal error: Call to undefined function: json_decode() in /in/VaQJW on line 4
Process exited with code 255.
Output for 4.3.0 - 4.3.1
Fatal error: Call to undefined function: json_decode() in /in/VaQJW on line 4