php-doc-en/functions/url.xml

 <reference id="ref.url">
  <title>URL Functions</title>
  <titleabbrev>URLs</titleabbrev>

  <refentry id="function.base64-decode">
   <refnamediv>
    <refname>base64_decode</refname>
    <refpurpose>Decodes data encoded with MIME base64</refpurpose>
   </refnamediv>
   <refsect1>
    <title>Description</title>
    <funcsynopsis>
     <funcdef>string <function>base64_decode</function></funcdef>
     <paramdef>string <parameter>encoded_data</parameter></paramdef>
    </funcsynopsis>
    <para>
     <function>Base64_decode</function> decodes
     <parameter>encoded_data</parameter> and returns the original
     data.  The returned data may be binary.
    </para>
    <para>
     See also: <function>base64_encode</function>, RFC-2045 section
     6.8.
    </para>
   </refsect1>
  </refentry>

  <refentry id="function.base64-encode">
   <refnamediv>
    <refname>base64_encode</refname>
    <refpurpose>Encodes data with MIME base64</refpurpose>
   </refnamediv>
   <refsect1>
    <title>Description</title>
    <funcsynopsis>
     <funcdef>string <function>base64_encode</function></funcdef>
     <paramdef>string <parameter>data</parameter></paramdef>
    </funcsynopsis>
    <para>
     <function>Base64_encode</function> returns
     <parameter>data</parameter> encoded with base64.  This encoding
     is designed to make binary data survive transport through
     transport layers that are not 8-bit clean, such as mail bodies.
    </para>
    <para>
     Base64-encoded data takes about 33% more space than the original
     data.</para>
    <para>
     See also:
     <function>base64_decode</function>,
     <function>chunk_split</function>,
     RFC-2045 section 6.8.
    </para>
   </refsect1>
  </refentry>

  <refentry id="function.parse-url">
   <refnamediv>
    <refname>parse_url</refname>
    <refpurpose>Parse a URL and return its components</refpurpose>
   </refnamediv>
   <refsect1>
    <title>Description</title>
    <funcsynopsis>
     <funcdef>array <function>parse_url</function></funcdef>
     <paramdef>string <parameter>url</parameter></paramdef>
    </funcsynopsis>
    <para>
     This function returns an associative array returning any of the
     various components of the URL that are present. This includes the
     "scheme", "host", "port", "user", "pass", "path", "query", and
     "fragment".
    </para>
   </refsect1>
  </refentry>

  <refentry id="function.urldecode">
   <refnamediv>
    <refname>urldecode</refname>
    <refpurpose>Decodes URL-encoded string</refpurpose>
   </refnamediv>
   <refsect1>
    <title>Description</title>
    <funcsynopsis>
     <funcdef>string <function>urldecode</function></funcdef>
     <paramdef>string <parameter>str</parameter></paramdef>
    </funcsynopsis>
    <para>
     Decodes any <literal>%<replaceable>##</replaceable></literal>
     encoding in the given string.  The decoded string is returned.
     <example>
      <title><function>Urldecode</function> example</title>
      <programlisting role="php">
$a = split ('&', $querystring);
$i = 0;
while ($i &lt; count ($a)) {
    $b = split ('=', $a [$i]);
    echo 'Value for parameter ', htmlspecialchars (urldecode ($b [0])),
         ' is ', htmlspecialchars (urldecode ($b [1])), "&lt;BR>";
    $i++;
}
      </programlisting>
     </example>
    </para>
    <para>
     See also <function>urlencode</function>.
    </para>
   </refsect1>
  </refentry>

  <refentry id="function.urlencode">
   <refnamediv>
    <refname>urlencode</refname>
    <refpurpose>URL-encodes string</refpurpose>
   </refnamediv>
   <refsect1>
    <title>Description</title>
    <funcsynopsis>
     <funcdef>string <function>urlencode</function></funcdef>
     <paramdef>string <parameter>str</parameter></paramdef>
    </funcsynopsis>
    <para>
     Returns a string in which all non-alphanumeric characters except
     <literal>-_.</literal> have been replaced with a percent
     (<literal>%</literal>) sign followed by two hex digits and spaces
     encoded as plus (<literal>+</literal>) signs.  It is encoded the
     same way that the posted data from a WWW form is encoded, that is
     the same way as in
     <literal>application/x-www-form-urlencoded</literal> media type.
     This differs from the RFC1738 encoding (see
     <function>rawurlencode</function>) in that for historical
     reasons, spaces are encoded as plus (+) signs.  This function is
     convenient when encoding a string to be used in a query part of
     an URL, as a convenient way to pass variables to the next page:
     <example>
      <title><function>Urlencode</function> example</title>
      <programlisting role="php">
echo '&lt;A HREF="mycgi?foo=', urlencode ($userinput), '">';
      </programlisting>
     </example>
    </para>
    <para>
     See also <function>urldecode</function>.
    </para>
   </refsect1>
  </refentry>

 </reference>

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