为什么'PHP的str_replace（）导致编码问题？

Question

I have a string that I am passing through str_replace() , and it seems to have some effect on encoding that I cannot figure out.

example:

$str = "joined nearly 500 of the world’s investors .."; //shorted exceprt
$str = str_replace(' ', ' ', $str);
var_dump($str);

gives:

joined nearly 500 of the worldÂ’s investors

any idea how to prevent this?

Answer 1

In your input, you have a smart quote that is not in its entity! Plus, you probably want to use UTF-8 so try this:

$str = "joined nearly 500 of the world’s investors .."; //shorted exceprt
$str = htmlentities($str, ENT_QUOTES, "UTF-8");
$str = str_replace(' ', ' ', $str);
var_dump($str);

Answer 2

That has nothing to do with str_replace or PHP, but rather HTML/browser charset encoding.

You can either do (in PHP, before anything else):

header('Content-Type: text/html; charset=utf-8');

Or (in the head section of your HTML - HTML 5 here):

<meta charset="utf-8">

Another alternative would be to change your browsers default encoding.