Trying to add a character limit to a text input but javascript and php show different string lengths

Question

I notice the problem when I use the character ¦. For the 3000 character limit, I can fill the textarea with 3000 ampersands. The javascript showing the string length says 3000 and when I post the text, php says it's 3000. If I try 3000 of ¦ then javascript again shows 3000, but php shows a lot more, in the 5000's. ¦ has a html code ¦ and ¦ so I don't know why php is showing a problem. Why is this?

Edit: PHP shows that each ¦ has a string length of 2, while other characters have the usual 1. I notice that any character with an ASCII code higher than 160 has a php string length of 2: http://www.ascii.cl/htmlcodes.htm

When the textarea is posted I'm just echoing strlen($_POST['text']) — user1755043
– user1755043, Commented Jun 7, 2013 at 5:32

MaX · Accepted Answer · 2013-06-07 05:53:20Z

2

You may be dealing with multicharacter UTF-8 chars. To have those counted correctly, assuming your files are actually UTF-8, try this:

mb_internal_encoding("UTF-8");
mb_regex_encoding("UTF-8"); // Not actually needed in this case, but add it if you use preg_ functions
echo mb_strlen("¦");

mb_* functions are meant to deal with multibyte characters.

answered Jun 7, 2013 at 5:53

MaX

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