php-doc-en/reference/intl/idn/idn-to-ascii.xml

<?xml version="1.0" encoding="utf-8"?>
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<refentry xml:id="function.idn-to-ascii" xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink">
 <refnamediv>
  <refname>idn_to_ascii</refname>
  <refpurpose>Convert domain name to IDNA ASCII form</refpurpose>
 </refnamediv>
 <refsect1 role="description">
  &reftitle.description;
  <para>&style.procedural;</para>
  <methodsynopsis>
   <type class="union"><type>string</type><type>false</type></type><methodname>idn_to_ascii</methodname>
   <methodparam><type>string</type><parameter>domain</parameter></methodparam>
   <methodparam choice="opt"><type>int</type><parameter>flags</parameter><initializer><constant>IDNA_DEFAULT</constant></initializer></methodparam>
   <methodparam choice="opt"><type>int</type><parameter>variant</parameter><initializer><constant>INTL_IDNA_VARIANT_UTS46</constant></initializer></methodparam>
   <methodparam choice="opt"><type>array</type><parameter role="reference">idna_info</parameter><initializer>&null;</initializer></methodparam>
  </methodsynopsis>
  <para>
   This function converts a Unicode domain name to an IDNA ASCII-compatible format.  
  </para> 
  </refsect1>

 <refsect1 role="parameters">
  &reftitle.parameters;
  <para>
   <variablelist>
    <varlistentry>
     <term><parameter>domain</parameter></term>
     <listitem>
      <para>
       The domain to convert, which must be UTF-8 encoded.
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>flags</parameter></term>
     <listitem>
      <para>
       Conversion options - combination of IDNA_* constants
       (except IDNA_ERROR_* constants).
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>variant</parameter></term>
     <listitem>
      <para>
       Either <constant>INTL_IDNA_VARIANT_2003</constant> (deprecated as of PHP 7.2.0) for IDNA 2003 or
       <constant>INTL_IDNA_VARIANT_UTS46</constant> (only available as of ICU 4.6) for UTS #46.
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>idna_info</parameter></term>
     <listitem>
      <para>
       This parameter can be used only if
       <constant>INTL_IDNA_VARIANT_UTS46</constant> was used for
       <parameter>variant</parameter>. In that case, it will be filled with an
       array with the keys <literal>'result'</literal>, the possibly illegal
       result of the transformation,
       <literal>'isTransitionalDifferent'</literal>, a boolean indicating
       whether the usage of the transitional mechanisms of UTS #46 either has
       or would have changed the result and <literal>'errors'</literal>,
       which is an <type>int</type> representing a bitset of the error
       constants IDNA_ERROR_*.
      </para>
     </listitem>
    </varlistentry>
   </variablelist>
  </para>
 </refsect1>
 
 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <para>
   The domain name encoded in ASCII-compatible form, &return.falseforfailure;
  </para>
 </refsect1>

 <refsect1 role="changelog">
  &reftitle.changelog;
  <para>
   <informaltable>
    <tgroup cols="2">
     <thead>
      <row>
       <entry>&Version;</entry>
       <entry>&Description;</entry>
      </row>
     </thead>
     <tbody>
      <row>
       <entry>7.4.0</entry>
       <entry>
        The default value of <parameter>variant</parameter> is now
        <constant>INTL_IDNA_VARIANT_UTS46</constant> instead of the deprecated
        <constant>INTL_IDNA_VARIANT_2003</constant>.
       </entry>
      </row>
      <row>
       <entry>7.2.0</entry>
       <entry>
        <constant>INTL_IDNA_VARIANT_2003</constant> has been deprecated; use
        <constant>INTL_IDNA_VARIANT_UTS46</constant> instead.
       </entry>
      </row>
     </tbody>
    </tgroup>
   </informaltable>
  </para>
 </refsect1>
 
 <refsect1 role="examples">
  &reftitle.examples;
  <example>
   <title><function>idn_to_ascii</function> example</title>
   <programlisting role="php">
<![CDATA[
<?php

echo idn_to_ascii('täst.de'); 

?>
]]>
   </programlisting>
  </example>
  &example.outputs;
  <screen>
<![CDATA[
xn--tst-qla.de
]]>
  </screen>
 </refsect1>

 <refsect1 role="seealso">
  &reftitle.seealso;
  <para>
   <simplelist>
    <member><function>idn_to_utf8</function></member>
   </simplelist>
  </para>
 </refsect1>
</refentry>
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