如何将Unicode特殊字符转换为html实体？

Question

我有以下字符串:

$string = "? This is some text ?";

我想将其转换为html实体:

$string = "★ This is some text ★";

每个人都在写的解决方案:

htmlentities("? This is some text ?", "UTF-8");

但是htmlentities无法将所有unicode转换为html实体.所以它只是给我与输入相同的输出:

? This is some text ?

我也尝试将这个解决方案与两者结合起来:

header('Content-Type: text/plain; charset=utf-8');

和:

mb_convert_encoding();

但这打印和空结果,根本不转换或错误地将星星转换为:

Â

如何将★和所有其他unicode字符转换为正确的html实体？

Answer 1

htmlentities在这种情况下不起作用,但您可以尝试UCS-4对字符串进行编码,例如:

$string = "? This is some text ?";
$entity = preg_replace_callback('/[\x{80}-\x{10FFFF}]/u', function ($m) {
    $char = current($m);
    $utf = iconv('UTF-8', 'UCS-4', $char);
    return sprintf("&#x%s;", ltrim(strtoupper(bin2hex($utf)), "0"));
}, $string);
echo $entity;

★ This is some text ★

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