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run code in 300+ PHP versions simultaneously

@ 2014-01-22T16:05:39Z

<?php


    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);
    }



















/**
 * Checks whether a string is valid json.
 *
 * @param string $string
 * @return boolean
 */
function isJson($string, $assoc = false) {



    // Make sure the string is not empty and is, in fact, a string.
    // An empty string is not valid JSON.
    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(json_decode(''));

var_dump(isJson($c));

Output for 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 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: NULL bool(false)
Output for 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29: Parse error: syntax error, unexpected '[' in /in/TX64O on line 66
Process exited with code 255.
Output for 5.0.0 - 5.0.5: Parse error: parse error, unexpected '[' in /in/TX64O on line 66
Process exited with code 255.
Output for 4.4.2 - 4.4.9: Parse error: syntax error, unexpected '{' in /in/TX64O on line 7
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.3.11, 4.4.0 - 4.4.1: Parse error: parse error, unexpected '{' in /in/TX64O on line 7
Process exited with code 255.
Output for 4.3.2 - 4.3.4: Parse error: parse error in /in/TX64O on line 7
Process exited with code 255.

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