Why does the PHP function htmlentities(…) returns wrong results?

问题

I have the following code :

function testAccents() {
    $str = "àéè";
    $html = htmlentities($str);
    echo $html;
}

When I run it, instead of getting àéè I get àéè.

I thought that it could be a problem of encoding but the file is utf-8 :

> file -bi PublicationTest.php 
  text/x-c++; charset=utf-8

Why do I get this strange result ?

EDIT: I use PHP 5.3.

回答1:

Before PHP 5.4.0, htmlentities() expects ISO-8859-1 data by default. It's interpreting your UTF-8 input as single-byte characters, which results in the funny results you get.

Specify the encoding specifically.

$html = htmlentities($str, ENT_COMPAT, "UTF-8");

来源：https://stackoverflow.com/questions/13246903/why-does-the-php-function-htmlentities-returns-wrong-results