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@ 2019-05-22T09:05:13Z

<?php

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

if ( isJson(123) ) {
    echo "valid JSON";
} else {
    echo "not valid JSON";
}

Output
Performance
VLD
References
Branches

json_decode: documentation ( source)
json_last_error: documentation ( source)

preferences:dark modelive preview

55.19 ms | 405 KiB | 5 Q