stream-context-create.xml

<?xml version="1.0" encoding="utf-8"?>
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<!-- CREDITS: her-cat, Luffy -->
<refentry xml:id="function.stream-context-create" xmlns="http://docbook.org/ns/docbook">
 <refnamediv>
  <refname>stream_context_create</refname>
  <refpurpose>创建资源流上下文</refpurpose>
 </refnamediv>
 <refsect1 role="description">
  &reftitle.description;
  <methodsynopsis>
   <type>resource</type><methodname>stream_context_create</methodname>
   <methodparam choice="opt"><type class="union"><type>array</type><type>null</type></type><parameter>options</parameter><initializer>&null;</initializer></methodparam>
   <methodparam choice="opt"><type class="union"><type>array</type><type>null</type></type><parameter>params</parameter><initializer>&null;</initializer></methodparam>
  </methodsynopsis>
  <para>
   创建并返回一个资源流上下文，该资源流中包含了 <parameter>options</parameter> 中提前设定的所有参数的值。
  </para>
 </refsect1>

 <refsect1 role="parameters">
  &reftitle.parameters;
  <para>
   <variablelist>
    <varlistentry>
     <term><parameter>options</parameter></term>
     <listitem>
      <para>
       必须是一个二维关联数组或 &null;，二维关联数组格式如下：<literal>$arr['wrapper']['option'] = $value</literal>。请参考
       <link linkend="context">上下文（Context）选项</link> 中可用的封装协议和选项列表。
      </para>
      <para>
       默认为 &null;。
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>params</parameter></term>
     <listitem>
      <para>
       必须是 <literal>$arr['parameter'] = $value</literal> 格式的关联数组或 &null;。
       请参考 <link linkend="context.params">上下文（Context）参数</link> 里的标准资源流参数列表。
      </para>
     </listitem>
    </varlistentry>
   </variablelist>
  </para>
 </refsect1>

 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <para>
   上下文资源流，类型为 <type>resource</type> 。
  </para>
 </refsect1>

 <refsect1 role="changelog">
  &reftitle.changelog;
  <informaltable>
   <tgroup cols="2">
    <thead>
     <row>
      <entry>&Version;</entry>
      <entry>&Description;</entry>
     </row>
    </thead>
    <tbody>
     <row>
      <entry>8.0.0</entry>
      <entry>
       现在 <parameter>options</parameter> 和 <parameter>params</parameter> 可以为 null。
      </entry>
     </row>
    </tbody>
   </tgroup>
  </informaltable>
 </refsect1>

 <refsect1 role="examples">
  &reftitle.examples;
  <example>
   <title>使用 <function>stream_context_create</function></title>
   <programlisting role="php">
<![CDATA[
<?php
$opts = [
  'http' => [
    'method' => "GET",
    // Use newline \n to separate multiple headers
    'header' => "Accept-language: en\nCookie: foo=bar",
  ]
];

$context = stream_context_create($opts);

/* 包含上面的 header 头，向 www.example.com
   发送 HTTP 请求 */
$fp = fopen('http://www.example.com', 'r', false, $context);
fpassthru($fp);
fclose($fp);
?>
]]>
   </programlisting>
  </example>
 </refsect1>

 <refsect1 role="seealso">
  &reftitle.seealso;
  <simplelist>
   <member><function>stream_context_set_option</function></member>
   <member>支持的封装协议列表（<xref linkend="wrappers"/>）</member>
   <member>上下文选项（<xref linkend="context"/>）</member>
  </simplelist>
 </refsect1>
</refentry>

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