How to convert some multibyte characters into its numeric html entity using PHP?

问题

Test string:

$s = "convert this: ";
$s .= "–, —, †, ‡, •, ≤, ≥, μ, ₪, ©, ® y ™, ⅓, ⅔, ⅛, ⅜, ⅝, ⅞, ™, Ω, ℮, ∑, ⌂, ♀, ♂ ";
$s .= "but, not convert ordinary characters to entities";

回答1:

$encoded = mb_convert_encoding($s, 'HTML-ENTITIES', 'UTF-8'); 

asssuming your input string is UTF-8, this should encode most everything into numeric entities.

回答2:

Well htmlentities doesn't work correctly. Fortunately someone has posted code on the php website that seems to do the translation of multibyte characters properly

回答3:

I did work on decoding ascii into html coded text (&#xxxx). https://github.com/hellonearthis/ascii2web

来源：https://stackoverflow.com/questions/5123638/how-to-convert-some-multibyte-characters-into-its-numeric-html-entity-using-php