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

  <refentry id="function.base64-decode">
   <refnamediv>
    <refname>base64_decode</refname>
    <refpurpose>Dekdovat data kdovan pomoc MIME base64</refpurpose>
   </refnamediv>
   <refsect1>
    <title>Popis</title>
     <methodsynopsis>
      <type>string</type><methodname>base64_decode</methodname>
      <methodparam><type>string</type><parameter>encoded_data</parameter></methodparam>
     </methodsynopsis>
    <para>
     <function>base64_decode</function> dekduje
     <parameter>encoded_data</parameter> a vrt pvodn data. Vrcen
     data mohou bt binrn
    </para>
    <para>
     Viz tak: <function>base64_encode</function>, RFC 2045 sekce 6.8.
    </para>
   </refsect1>
  </refentry>

  <refentry id="function.base64-encode">
   <refnamediv>
    <refname>base64_encode</refname>
    <refpurpose>Zakdovat data pomoc MIME base64</refpurpose>
   </refnamediv>
   <refsect1>
    <title>Popis</title>
     <methodsynopsis>
      <type>string</type><methodname>base64_encode</methodname>
      <methodparam><type>string</type><parameter>data</parameter></methodparam>
     </methodsynopsis>
    <para>
     <function>base64_encode</function> vrt
     <parameter>data</parameter> zakdovan pomoc base64. Toto kdovn
     je navreno tak, aby umonilo binrnm datm pet transport penosovmi
     vrstvami, kter nejsou osmibitov, jako jsou napklad tla email.
    </para>
    <para>
    Data kdovan pomoc base64 zabraj o zhruba 33% prostoru vce ne pvodn
    data.
    </para>
    <para>
    Viz tak:
     <function>base64_decode</function>,
     <function>chunk_split</function>,
     RFC-2045 sekce 6.8.
    </para>
   </refsect1>
  </refentry>

  <refentry id="function.parse-url">
   <refnamediv>
    <refname>parse_url</refname>
    <refpurpose>Rozebrat URL a vrtit jej komponenty</refpurpose>
   </refnamediv>
   <refsect1>
    <title>Popis</title>
     <methodsynopsis>
      <type>array</type><methodname>parse_url</methodname>
      <methodparam><type>string</type><parameter>url</parameter></methodparam>
     </methodsynopsis>
    <para>
    Tato funkce vrt asociativn pole vech komponent URL ptomnych v
    <parameter>url</parameter>. Ty mohou bt: "scheme", "host", "port",
    "user", "pass", "path", "query" a "fragment".
    </para>
   </refsect1>
  </refentry>

  <refentry id="function.rawurldecode">
   <refnamediv>
    <refname>rawurldecode</refname>
    <refpurpose>Dekdovat URL-kdovan etzec</refpurpose>
   </refnamediv>
   <refsect1>
    <title>Popis</title>
     <methodsynopsis>
      <type>string</type><methodname>rawurldecode</methodname>
      <methodparam><type>string</type><parameter>str</parameter></methodparam>
     </methodsynopsis>
    <para>
    Vrt etzec, ve kterm sekvence znaku procent (<literal>%</literal>)
    nsledovch dvma estnctkovmi slicemi byly nahrazeny prostmi znaky.
    Napklad etzec <screen>foo%20bar%40baz</screen> dekduje na
    <screen>foo bar@baz</screen>.
    </para>
    <simpara>
     Viz tak: <function>rawurlencode</function>,
     <function>urldecode</function>,
     <function>urlencode</function>.
    </simpara>
   </refsect1>
  </refentry>

  <refentry id="function.rawurlencode">
   <refnamediv>
    <refname>rawurlencode</refname>
    <refpurpose>URL-kdovat podle RFC1738</refpurpose>
   </refnamediv>
   <refsect1>
    <title>Popis</title>
     <methodsynopsis>
      <type>string</type><methodname>rawurlencode</methodname>
      <methodparam><type>string</type><parameter>str</parameter></methodparam>
     </methodsynopsis>
    <para>
    Vrt etzec, ve kterm byly vechny nealfanumerick znaky krom
    <screen>-_.</screen> nahrazeny znakem procent (<literal>%</literal>)
    nsledovanm dvma estnctkovmi slicemi. To je kdovn popsan
    v RFC1738 na ochranu prostch znak ped interpretac jako zvltn
    oddlovae v URL a na ochranu URL ped komolenm penosovmi systmy
    se znakovmi konvencemi (jako jsou nkter emailov systmy). Napklad,
    pokud chcete k FTP URL pidat heslo:
     <example>
      <title>Pklad <function>rawurlencode</function> . 1</title>
      <programlisting role="php">
echo '&lt;A HREF="ftp://user:', rawurlencode ('foo @+%/'),
     '@ftp.my.com/x.txt">';
      </programlisting>
     </example>
     Nebo, pokud pedvte informace v komponent URL obsahujc info o cest:
     <example>
      <title>Pklad <function>rawurlencode</function> . 2</title>
      <programlisting role="php">
echo '&lt;A HREF="http://x.com/department_list_script/',
    rawurlencode ('sales and marketing/Miami'), '">';
      </programlisting>
     </example>
    </para>
    <simpara>
     Viz tak: <function>rawurldecode</function>,
     <function>urldecode</function>,
     <function>urlencode</function>.
    </simpara>
   </refsect1>
  </refentry>

  <refentry id="function.urldecode">
   <refnamediv>
    <refname>urldecode</refname>
    <refpurpose>Dekdovat URL-kdovan etzec</refpurpose>
   </refnamediv>
   <refsect1>
    <title>Popis</title>
     <methodsynopsis>
      <type>string</type><methodname>urldecode</methodname>
      <methodparam><type>string</type><parameter>str</parameter></methodparam>
     </methodsynopsis>
    <para>
     Dekduje vechny <literal>%<replaceable>##</replaceable></literal>
     kdy v danm etzci. Vrt dekdovan etzec.
     <example>
      <title>Pklad <function>urldecode</function></title>
      <programlisting role="php">
$a = split ('&amp;', $querystring);
$i = 0;
while ($i &lt; count ($a)) {
    $b = split ('=', $a [$i]);
    echo 'Hodnota argumentu ', htmlspecialchars (urldecode ($b [0])),
         ' je ', htmlspecialchars (urldecode ($b [1])), "&lt;BR>";
    $i++;
}
      </programlisting>
     </example>
    </para>
    <para>
     Viz tak <function>urlencode</function>,
     <function>rawurlencode</function>,
     <function>rawurldecode</function>.
    </para>
   </refsect1>
  </refentry>

  <refentry id="function.urlencode">
   <refnamediv>
    <refname>urlencode</refname>
    <refpurpose>URL-kdovat etzec</refpurpose>
   </refnamediv>
   <refsect1>
    <title>Popis</title>
     <methodsynopsis>
      <type>string</type><methodname>urlencode</methodname>
      <methodparam><type>string</type><parameter>str</parameter></methodparam>
     </methodsynopsis>
    <para>
    Vrt etzec, ve kterm byly vechny nealfanumerick znaky krom
     <literal>-_.</literal> nahrazeny znakem procent (<literal>%</literal>)
     nsledovanm dvma estncktovmi slicemi a mezery kdovny jako
     znaky plus (<literal>+</literal>). Kdovn je stejn jako u dat
     postovanch z WWW formule, tj. stejn jako u
     <literal>application/x-www-form-urlencoded</literal> typu.
     To se li od RFC1738 kdovn (viz
     <function>rawurlencode</function>) v tom, e z historickch dvod
     se mezery kduj jako znaky plus (<literal>+</literal>). Tato funkce
     je vhodn pi kdovn etzce, kter se m pout jako query st URL
     jako phodn zpsob pedn promnnch na dal strnku:
     <example>
      <title>Pklad <function>urlencode</function></title>
      <programlisting role="php">
echo '&lt;A HREF="mycgi?foo=', urlencode ($userinput), '"&gt;';
      </programlisting>
     </example>
    </para>
	<para> Poznmka: pozor pi pedvn promnnch, kter by mohly
	odpovdat HTML entitm. Vci jako &amp;amp, &amp;copy a &amp;pound
	browser analyzuje a msto poadovanho jmna promnn pouije
	odpovdajc entitu. To je zejm problm, na kter W3C upozoruje u
	lta. Pruka je tady: <ulink url="&url.argsep;">&url.argsep;</ulink>
	PHP podporuje zmnu oddlovae argument na stednk doporuovan W3C
	skrze .ini direktivu arg_separator. Bohuel, vtina uivatelskch program
	neposl data z formul v tomto formtu. Penositelnj formou je
	pout jako oddlova &amp;amp; msto &amp;. Na to nemuste mnit
	arg_separator. Nechte ho na &amp;, ale kdujte URL pomoc
	<function>htmlentities</function> (urlencode($data)).
     <example>
      <title>Pklad na <function>urlencode/htmlentities</function></title>
      <programlisting role="php">
echo '&lt;A HREF="mycgi?foo=', htmlentities (urlencode ($userinput) ), '"&gt;';
      </programlisting>
     </example>
	</para>
    <para>
     Viz tak <function>urldecode</function>,
     <function>htmlentities</function>,
     <function>rawurldecode</function>,
     <function>rawurlencode</function>.
    </para>
   </refsect1>
  </refentry>

 </reference>

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