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

Question

Test string:

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


        

Answer 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.