zed</span>
</pre></div>
</div>
<p><a class="reference external" href="http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html">See here</a> for
a full list of headers.</p>
</dd></dl>

<dl class="function">
<dt id="remove_invisible_characters">
<code class="descname">remove_invisible_characters</code><span class="sig-paren">(</span><em>$str</em><span class="optional">[</span>, <em>$url_encoded = TRUE</em><span class="optional">]</span><span class="sig-paren">)</span><a class="headerlink" href="#remove_invisib