How Can I Optimize JSON Validation Performance in PHP?

Optimizing JSON Validation Performance in PHP

In many web development scenarios, it becomes crucial to efficiently determine if a string contains valid JSON data. While there are various approaches to this task, some methods may not provide optimal performance.

One commonly employed approach is presented below:

function isJson($string) {
    return ((is_string($string) &&
            (is_object(json_decode($string)) ||
            is_array(json_decode($string))))) ? true : false;
}

For performance-oriented developers, this method may necessitate improvements due to the overhead associated with decoding the JSON string multiple times.

Optimized Validation Method

To enhance performance, consider utilizing the following optimized function:

function isJson($string) {
   json_decode($string);
   return json_last_error() === JSON_ERROR_NONE;
}

This updated function leverages PHP's json_decode() function to parse the string and then checks for any errors using json_last_error().

PHP 8.3 Solution

In PHP versions 8.3 and above, you can employ the built-in json_validate() function, which provides a more concise and efficient solution:

use json_validate() built-in function

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