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run code in 150+ php & hhvm versions
Bugs & Features
<?php /** * Checks whether a string is valid json. * * @param string $string * @return boolean */ function json_is($string) { try { // try to decode string json_decode($string); } catch (ErrorException $e) { // exception has been caught which means argument wasn't a string and thus is definitely no json. return FALSE; } // check if error occured return (json_last_error() == JSON_ERROR_NONE); } // Make sure the string is not empty and is, in fact, a string. An empty string is not valid JSON. function is_json($string) { return !empty($string) && is_string($string) && is_array(json_decode($string, true)) && json_last_error() == 0; } //I think in PHP it's more important to determine if the JSON object even has data, because to use the data you will need to call json_encode() //or json_decode(). I suggest denying empty JSON objects so you aren't unnecessarily running encodes and decodes on empty data. function has_json_data($string) { $array = json_decode($string, true); return !empty($string) && is_string($string) && is_array($array) && !empty($array) && json_last_error() == 0; } function isJson($string, $assoc = false) { var_dump(json_decode($string)); json_decode($string, $assoc); if(!empty($string) && is_string($string)) { json_decode($string, $assoc); return (json_last_error() == JSON_ERROR_NONE); // return json_decode($str) != null; } return false; } $a=['arraiii'=>['dentro'=>234]]; $b=json_encode($a); $c='{}'; var_dump(isJson($c));
Output for 5.4.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
object(stdClass)#1 (0) { } bool(true)
Output for 5.1.0 - 5.3.29
Parse error: syntax error, unexpected '[' in /in/DTERp on line 83
Process exited with code 255.
Output for 5.0.0 - 5.0.5
Parse error: parse error, unexpected '[' in /in/DTERp on line 83
Process exited with code 255.
Output for 4.4.2 - 4.4.9
Parse error: syntax error, unexpected '{' in /in/DTERp on line 12
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/DTERp on line 12
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/DTERp on line 12
Process exited with code 255.