php – 如何区分可读的UTF-8字符串和二进制乱码？

通过可读的UTF,我的意思是任何有效的UTF-8,而不是(当然)用户必须有一个字体来读取该字符串.
可读字符串的示例：

$readable_str0 = "Mary had a little lamb.";
$readable_str1 = "Píerně luouk kň úpěl ábelské ódy.";
$readable_str4 = "           ";
$readable_str5 = ""; //(Dzongkha)
$readable_str7 = "とりなくこゑす　ゆめさませ　みよあけわたる";
$readable_str8 = "TWFyeSBoYWQgYSBsaXR0bGUgbGFtYi4=";

不可读的字符串：

$not_readable_str0 = "M,THLQHT,)IUIM";
$not_readable_str1 = "9Píerně luouk kň úpěl ábelské ódy."
// this has some odd characters at the beginning so should count as unreadable
// it was result of gzdeflate of readable str 1
$not_readable_str4 = "5ńV×~1xkk’áJ";
//some random selection from gif file

$str2 = iconv("UTF-8","UTF-8//IGNORE",$str);

并比较$str和$str2的长度.

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