How to obtain the HTML entity numbers corresponding to characters (including text)

How can I obtain the HTML entity numbers corresponding to characters (including text)? how can PHP obtain the HTML entity numbers corresponding to characters (including text), as shown in
Number 3 corresponds to 3

Reply to discussion (solution)

$ S = 'Excuse me, how does PHP obtain the HTML entity number corresponding to characters (including text), for example, number 3 corresponds to 3'; echo '&#'. join ('; & #', unpack ('C * ', $ s )). ';';

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Note the differences between character sets

No, it should be unified into unicode encoding

$ S = iconv ('gbk', 'ucs-2', 'how does PHP obtain the HTML entity numbers corresponding to characters (including text, for example, number 3 corresponds to 3 '); echo '&#'. join ('; & #', unpack ('n' * ', $ s )). ';';

How does PHP obtain the HTML entity numbers corresponding to characters (including text), for example, 3 corresponds to 3

No, it should be unified into unicode encoding

$ S = iconv ('gbk', 'ucs-2', 'how does PHP obtain the HTML entity numbers corresponding to characters (including text, for example, number 3 corresponds to 3 '); echo '&#'. join ('; & #', unpack ('n' * ', $ s )). ';';

How does PHP obtain the HTML entity numbers corresponding to characters (including text), for example, 3 corresponds to 3

Why is UNICODE encoded in a unified manner? will the selection of language families on my page be affected?