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@ 2015-10-01T14:22:14Z

<?php

$string = 'u4F60u597Du4E16u754C';
$string = json_decode('"' . $string . '"');
$valid = mb_check_encoding($string, 'UTF-8');
echo ($valid) ? 'valid' : 'invalid';
?>

Output
Performance
VLD
References
Branches

json_decode: documentation ( source)
mb_check_encoding: documentation ( source)

preferences:dark modelive preview

45.48 ms | 402 KiB | 5 Q