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run code in 200+ php & hhvm versions
Bugs & Features
<?php function isJson2($string) { try { json_decode($string); } catch (ErrorException $e) { return FALSE; } return (json_last_error() == JSON_ERROR_NONE); } /** * Checks whether a string is valid JSON. * * @param string $string * @return boolean */ function isJson($string) { // Make sure the string is not empty and whether it is a string. if(!empty($string) && is_string($string)) { json_decode($string); return (json_last_error() == JSON_ERROR_NONE); } return false; } $a=['arraiii'=>['dentro'=>234]]; $b=json_encode(['asdf'=>45]); $c=''; var_export(json_decode($b)); var_dump(isJson($b));
Output for 7.3.0beta1 - 7.3.0rc3
(object) array( 'asdf' => 45, )bool(true)
Output for 5.4.0 - 7.1.7, 7.1.20 - 7.3.0alpha1
stdClass::__set_state(array( 'asdf' => 45, ))bool(true)
Output for 7.1.10

Process exited with code 137.
Output for 5.1.0 - 5.3.29
Parse error: syntax error, unexpected '[' in /in/S4UQe on line 35
Process exited with code 255.
Output for 5.0.0 - 5.0.5
Parse error: parse error, unexpected '[' in /in/S4UQe on line 35
Process exited with code 255.
Output for 4.4.2 - 4.4.9
Parse error: syntax error, unexpected '{' in /in/S4UQe on line 5
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.4.1
Parse error: parse error, unexpected '{' in /in/S4UQe on line 5
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/S4UQe on line 5
Process exited with code 255.