hash-file.xml

<?xml version="1.0" encoding="utf-8"?>
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<refentry xml:id="function.hash-file" xmlns="http://docbook.org/ns/docbook">
 <refnamediv>
  <refname>hash_file</refname>
  <refpurpose>Generate a hash value using the contents of a given file</refpurpose>
 </refnamediv>
 <refsect1 role="description">
  &reftitle.description;
  <methodsynopsis>
   <type class="union"><type>string</type><type>false</type></type><methodname>hash_file</methodname>
   <methodparam><type>string</type><parameter>algo</parameter></methodparam>
   <methodparam><type>string</type><parameter>filename</parameter></methodparam>
   <methodparam choice="opt"><type>bool</type><parameter>binary</parameter><initializer>&false;</initializer></methodparam>
   <methodparam choice="opt"><type>array</type><parameter>options</parameter><initializer>[]</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. <literal>"sha256"</literal>).
       For a list of supported algorithms see <function>hash_algos</function>.
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>filename</parameter></term>
     <listitem>
      <para>
       URL describing location of file to be hashed; Supports <function>fopen</function> wrappers.
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>binary</parameter></term>
     <listitem>
      <para>
       When set to &true;, outputs raw binary data.
       &false; outputs lowercase hexits.
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>options</parameter></term>
     <listitem>
      <para>
       An array of options for the various hashing algorithms.
       Currently, only the <literal>"seed"</literal> parameter is
       supported by the MurmurHash variants.
      </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>binary</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>8.1.0</entry>
       <entry>The <parameter>options</parameter> parameter has been added.</entry>
      </row>
     </tbody>
    </tgroup>
   </informaltable>
  </para>
 </refsect1>

 <refsect1 role="examples">
  &reftitle.examples;
  <para>
   <example>
    <title>Using <function>hash_file</function></title>
    <programlisting role="php">
<![CDATA[
<?php
/* Create a file to calculate hash of */
file_put_contents('example.txt', 'The quick brown fox jumped over the lazy dog.');

echo hash_file('sha256', 'example.txt');
?>
]]>
    </programlisting>
    &example.outputs;
    <screen>
<![CDATA[
68b1282b91de2c054c36629cb8dd447f12f096d3e3c587978dc2248444633483
]]>
    </screen>
   </example>
  </para>
 </refsect1>

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

</refentry>
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