fgets.xml

<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision$ -->
<!-- EN-Revision: 32e694be42ba6e75a8c78483c17a75725937d247 Maintainer: HonestQiao Status: ready -->
<!-- CREDITS: mowangjuanzi, Luffy -->
<refentry xml:id="function.fgets" xmlns="http://docbook.org/ns/docbook">
 <refnamediv>
  <refname>fgets</refname>
  <refpurpose>从文件指针中读取一行</refpurpose>
 </refnamediv>
 <refsect1 role="description">
  &reftitle.description;
  <methodsynopsis>
   <type class="union"><type>string</type><type>false</type></type><methodname>fgets</methodname>
   <methodparam><type>resource</type><parameter>stream</parameter></methodparam>
   <methodparam choice="opt"><type class="union"><type>int</type><type>null</type></type><parameter>length</parameter><initializer>&null;</initializer></methodparam>
  </methodsynopsis>
  <para>
   从文件指针中读取一行。
  </para>
 </refsect1>

 <refsect1 role="parameters">
  &reftitle.parameters;
  <para>
   <variablelist>
    <varlistentry>
     <term><parameter>stream</parameter></term>
     <listitem>
      &fs.validfp.all;
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>length</parameter></term>
     <listitem>
      <para>
       从 <parameter>handle</parameter>
       指向的文件中读取一行并返回长度最多为 <parameter>length</parameter> - 1
       字节的字符串。碰到换行符（包括在返回值中）、EOF 或者已经读取了 length - 1
       字节后停止（看先碰到那一种情况）。如果没有指定
       <parameter>length</parameter>，则默认为 1K，或者说 1024 字节。
      </para>
     </listitem>
    </varlistentry>
   </variablelist>
  </para>
 </refsect1>

 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <para>
   从指针 <parameter>stream</parameter> 指向的文件中读取了 <parameter>length</parameter> - 1 字节后返回字符串。 
   如果文件指针中没有更多的数据了则返回 &false;。
  </para>
  <para>
   错误发生时返回 &false;。
  </para>
 </refsect1>

 <refsect1 role="examples">
  &reftitle.examples;
  <para>
   <example>
    <title>逐行读取文件</title>
    <programlisting role="php">
<![CDATA[
<?php

$fp = @fopen("/tmp/inputfile.txt", "r");

if ($fp) {
    while (($buffer = fgets($fp, 4096)) !== false) {
        echo $buffer, PHP_EOL;
    }

    if (!feof($fp)) {
        echo "Error: unexpected fgets() fail\n";
    }

    fclose($fp);
}

?>
]]>
    </programlisting>
   </example>
  </para>
 </refsect1>

 <refsect1 role="notes">
  &reftitle.notes;
  &note.line-endings;
  <note>
   <para>
    习惯了 C 语言中 <function>fgets</function> 语法的人应该注意到 <literal>EOF</literal>
   是怎样被返回的。
   </para>
  </note>
 </refsect1>

 <refsect1 role="seealso">
  &reftitle.seealso;
  <para>
   <simplelist>
    <member><function>fgetss</function></member>
    <member><function>fread</function></member>
    <member><function>fgetc</function></member>
    <member><function>stream_get_line</function></member>
    <member><function>fopen</function></member>
    <member><function>popen</function></member>
    <member><function>fsockopen</function></member>
    <member><function>stream_set_timeout</function></member>
   </simplelist>
  </para>
 </refsect1>
</refentry>

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