3v4l.org

run code in 300+ PHP versions simultaneously
<?php $names = preg_grep('/^JSON_ERROR/', array_keys(get_defined_constants())); $errors = array_combine(array_map("constant", $names), $names); var_dump(json_decode('{"":123}'), $errors[json_last_error()]); var_dump(json_decode(""), $errors[json_last_error()]);
Output for 7.1.0 - 7.1.33, 7.2.0 - 7.2.34, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.34, 8.2.0 - 8.2.30, 8.3.0 - 8.3.30, 8.4.1 - 8.4.18, 8.5.0 - 8.5.3
object(stdClass)#1 (1) { [""]=> int(123) } string(15) "JSON_ERROR_NONE" NULL string(17) "JSON_ERROR_SYNTAX"
Output for 7.0.0 - 7.0.33
object(stdClass)#1 (1) { ["_empty_"]=> int(123) } string(15) "JSON_ERROR_NONE" NULL string(17) "JSON_ERROR_SYNTAX"
Output for 5.6.0 - 5.6.40
object(stdClass)#1 (1) { ["_empty_"]=> int(123) } string(15) "JSON_ERROR_NONE" NULL string(15) "JSON_ERROR_NONE"

preferences:
104.4 ms | 2022 KiB | 4 Q