title: Are there different types of double quotes in utf-8 (PHP, str_replace)?
body: <p>In PHP 5.3, am trying to replace double quotes in a string as such:</p>
  
  <pre><code>$bar = str_replace('"','\'',$foo);
  </code></pre>
  
  <p>But some quotes that are saved in the utf8-Database are not being replaced, although they look perfectly normal:</p>
  
  <p><code>"Some text"</code></p>
  
  <p>Are there different character types I have to search for?
  If so, which are they?</p>