hash-copy.xml

<?xml version="1.0" encoding="utf-8"?>
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<refentry xml:id="function.hash-copy" xmlns="http://docbook.org/ns/docbook">
 <refnamediv>
  <refname>hash_copy</refname>
  <refpurpose>拷贝哈希运算上下文</refpurpose>
 </refnamediv>
 <refsect1 role="description">
  &reftitle.description;
  <methodsynopsis>
   <type>HashContext</type><methodname>hash_copy</methodname>
   <methodparam><type>HashContext</type><parameter>context</parameter></methodparam>
  </methodsynopsis>
 </refsect1>

 <refsect1 role="parameters">
  &reftitle.parameters;
  <para>
   <variablelist>
    <varlistentry>
     <term><parameter>context</parameter></term>
     <listitem>
      <para>
       由 <function>hash_init</function> 函数返回的哈希运算上下文。
      </para>
     </listitem>
    </varlistentry>
   </variablelist>
  </para>
 </refsect1>

 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <para>
   返回哈希运算上下文的一个复本。
  </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>7.2.0</entry>
       <entry>
        接受的参数以及返回值从资源类型修改为 <classname>HashContext</classname> 对象类型。
       </entry>
      </row>
     </tbody>
    </tgroup>
   </informaltable>
  </para>
 </refsect1>
 
 <refsect1 role="examples">
  &reftitle.examples;
  <para>
   <example>
    <title><function>hash_copy</function> 示例</title>
    <programlisting role="php">
<![CDATA[
<?php
$context = hash_init("sha256");
hash_update($context, "The quick brown fox ");

/* 拷贝上下文资源以便继续使用 */
$copy_context = hash_copy($context);

echo hash_final($context), "\n";

hash_update($copy_context, "jumped over the lazy dog.");
echo hash_final($copy_context), "\n";
?>
]]>
    </programlisting>
    &example.outputs;
    <screen>
<![CDATA[
b29d66e56ed90cce9b0165c43fedec612b60a071974d8be4513e18580d55b5bd
68b1282b91de2c054c36629cb8dd447f12f096d3e3c587978dc2248444633483
]]>
    </screen>
   </example>
  </para>
 </refsect1>

</refentry>

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