php-doc-en/reference/hash/functions/hash.xml

<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision$ -->
<refentry xml:id="function.hash" xmlns="http://docbook.org/ns/docbook">
 <refnamediv>
  <refname>hash</refname>
  <refpurpose>Generate a hash value (message digest)</refpurpose>
 </refnamediv>
 <refsect1 role="description">
  &reftitle.description;
  <methodsynopsis>
   <type>string</type><methodname>hash</methodname>
   <methodparam><type>string</type><parameter>algo</parameter></methodparam>
   <methodparam><type>string</type><parameter>data</parameter></methodparam>
   <methodparam choice="opt"><type>bool</type><parameter>raw_output</parameter><initializer>false</initializer></methodparam>
  </methodsynopsis>

 </refsect1>
 <refsect1 role="parameters">
  &reftitle.parameters;
  <para>
   <variablelist>
    <varlistentry>
     <term><parameter>algo</parameter></term>
     <listitem>
      <para>
       Name of selected hashing algorithm (e.g. "md5", "sha256", "haval160,4", etc..)
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>data</parameter></term>
     <listitem>
      <para>
       Message to be hashed.
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>raw_output</parameter></term>
     <listitem>
      <para>
       When set to &true;, outputs raw binary data.
       &false; outputs lowercase hexits.
      </para>
     </listitem>
    </varlistentry>
   </variablelist>
  </para>
 </refsect1>

 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <para>
   Returns a string containing the calculated message digest as lowercase hexits
   unless <parameter>raw_output</parameter> is set to true in which case the raw
   binary representation of the message digest is returned.
  </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>5.4.0</entry>
       <entry>The tiger algorithm now uses big-endian byte ordering. See also example below.</entry>
      </row>
     </tbody>
    </tgroup>
   </informaltable>
  </para>
 </refsect1>

 <refsect1 role="examples">
  &reftitle.examples;
  <para>
   <example>
    <title>A <function>hash</function> example</title>
    <programlisting role="php">
<![CDATA[
<?php
echo hash('ripemd160', 'The quick brown fox jumped over the lazy dog.');
?>
]]>
    </programlisting>
    &example.outputs;
    <screen>
<![CDATA[
ec457d0a974c48d5685a7efa03d137dc8bbde7e3
]]>
    </screen>
   </example>
  </para>
  <para>
   <example xml:id="function.hash.tiger-bc">
    <title>Calculate pre PHP-5.4 tiger hashes with PHP-5.4 and higher</title>
    <programlisting role="php">
<![CDATA[
<?php
function old_tiger($data = "", $width=192, $rounds = 3) {
    return substr(
        implode(
            array_map(
                function ($h) {
                    return str_pad(bin2hex(strrev($h)), 16, "0");
                },
                str_split(hash("tiger192,$rounds", $data, true), 8)
            )
        ),
        0, 48-(192-$width)/4
    );
}
echo hash('tiger192,3', 'a-string'), PHP_EOL;
echo old_tiger('a-string'), PHP_EOL;
?>
]]>
    </programlisting>
    &example.outputs.53;
    <screen>
<![CDATA[
146a7492719b3564094efe7abbd40a7416fd900179d02773
64359b7192746a14740ad4bb7afe4e097327d0790190fd16
]]>
    </screen>
    &example.outputs.54;
    <screen>
<![CDATA[
64359b7192746a14740ad4bb7afe4e097327d0790190fd16
146a7492719b3564094efe7abbd40a7416fd900179d02773
]]>
    </screen>
   </example>
  </para>
 </refsect1>

 <refsect1 role="seealso">
  &reftitle.seealso;
  <para>
   <simplelist>
    <member><function>hash_file</function></member>
    <member><function>hash_hmac</function></member>
    <member><function>hash_init</function></member>
    <member><function>md5</function></member>
    <member><function>sha1</function></member>
   </simplelist>
  </para>
 </refsect1>

</refentry>

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