Use PHP native json_validate in isJson function if available #48367
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PHP 8.3 introduces a
json_validatefunction, which allows validating if a string contains valid json with less resource and memory consumption than using thejson_encodefunction.This PR uses the new function when it's available and thus is backwards compatible with older PHP versions, while taking advantage of the new function on PHP >= 8.3.
Note that Symfony has a polyfill for this, which is probably what will be used in practice by most existing Laravel installations using PHP < 8.3 (as the polyfills are loaded with recent versions of
symfony/http-foundation), which would allow removing thejson_decodecall sometime in the future.See also the RFC.