rewind.xml

<?xml version="1.0" encoding="utf-8"?>
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<refentry xml:id="function.rewind" xmlns="http://docbook.org/ns/docbook">
 <refnamediv>
  <refname>rewind</refname>
  <refpurpose>倒回文件指针的位置</refpurpose>
 </refnamediv>
 <refsect1 role="description">
  &reftitle.description;
  <methodsynopsis>
   <type>bool</type><methodname>rewind</methodname>
   <methodparam><type>resource</type><parameter>stream</parameter></methodparam>
  </methodsynopsis>
  <para>
   将 <parameter>stream</parameter> 的文件位置指针设为文件流的开头。
  </para>
  <note>
   <para>
    如果将文件以附加（"a" 或者 "a+"）模式打开，无论文件指针位置如何，写入文件的任何数据总是会被附加在后面。
   </para>
  </note>
 </refsect1>

 <refsect1 role="parameters">
  &reftitle.parameters;
  <para>
   <variablelist>
    <varlistentry>
     <term><parameter>stream</parameter></term>
     <listitem>
      <para>
       文件指针必须合法，并且指向由 <function>fopen</function>
       成功打开的文件。
      </para>
     </listitem>
    </varlistentry>
   </variablelist>
  </para>
 </refsect1>

 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <para>
   &return.success;
  </para>
 </refsect1>

 <refsect1 role="examples">
  &reftitle.examples;
  <para>
   <example>
    <title><function>rewind</function> overwriting example</title>
    <programlisting role="php">
<![CDATA[
<?php
$handle = fopen('output.txt', 'r+');

fwrite($handle, 'Really long sentence.');
rewind($handle);
fwrite($handle, 'Foo');
rewind($handle);

echo fread($handle, filesize('output.txt'));

fclose($handle);
?>
]]>
    </programlisting>
    &example.outputs.similar;
    <screen>
<![CDATA[
Foolly long sentence.
]]>
    </screen>
   </example>
  </para>
 </refsect1>

 <refsect1 role="seealso">
  &reftitle.seealso;
  <para>
   <simplelist>
    <member><function>fread</function></member>
    <member><function>fseek</function></member>
    <member><function>ftell</function></member>
    <member><function>fwrite</function></member>
   </simplelist>
  </para>
 </refsect1>

</refentry>
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