hash-file.xml

<?xml version="1.0" encoding="utf-8"?>
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<!-- Generated by xml_proto.php v2.3. Found in /scripts directory of phpdoc. -->
<refentry xml:id="function.hash-file" xmlns="http://docbook.org/ns/docbook">
 <refnamediv>
  <refname>hash_file</refname>
  <refpurpose>给指定文件的内容生成散列值</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>
       要使用的散列算法的名称（例如：<literal>“sha256”</literal>）。
       可以在 <function>hash_algos</function> 中查看当前支持的算法。
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>filename</parameter></term>
     <listitem>
      <para>
       要进行散列运算的文件位置的 URL；支持 <function>fopen</function> 封装协议。
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>binary</parameter></term>
     <listitem>
      <para>
       设置为 &true; 时，输出原始二进制数据。
       设置为 &false; 时，输出小写的十六进制字符串。
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>options</parameter></term>
     <listitem>
      <para>
       各种散列算法的一系列选项数组。
       目前 MurmurHash 算法仅支持 <literal>“seed”</literal> 参数。
      </para>
     </listitem>
    </varlistentry>
   </variablelist>
  </para>
 </refsect1>

 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <para>
   如果 <parameter>binary</parameter> 设置为 true， 则返回原始二进制数据表示的信息摘要，
   否则返回十六进制小写字符串格式表示的信息摘要。
  </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>新增 <parameter>options</parameter> 参数。</entry>
      </row>
     </tbody>
    </tgroup>
   </informaltable>
  </para>
 </refsect1>

 <refsect1 role="examples">
  &reftitle.examples;
  <para>
   <example>
    <title><function>hash_file</function> 示例</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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