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99 lines
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HTML
99 lines
7.8 KiB
HTML
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<html>
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<head>
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<meta http-equiv="content-type" content="text/html; charset=UTF-8">
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<title>Retrieve the default stream context</title>
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</head>
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<body class="docs"><div id="layout">
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<div id="layout-content"><div id="function.stream-context-get-default" class="refentry">
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<div class="refnamediv">
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<h1 class="refname">stream_context_get_default</h1>
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<p class="verinfo">(PHP 5 >= 5.1.0, PHP 7)</p><p class="refpurpose"><span class="refname">stream_context_get_default</span> — <span class="dc-title">Retrieve the default stream context</span></p>
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</div>
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<div class="refsect1 description" id="refsect1-function.stream-context-get-default-description">
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<h3 class="title">说明</h3>
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<div class="methodsynopsis dc-description">
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<span class="methodname"><strong>stream_context_get_default</strong></span>
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([ <span class="methodparam"><span class="type">array</span> <code class="parameter">$options</code></span>
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] ) : <span class="type">resource</span></div>
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<p class="simpara">
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Returns the default stream context which is used whenever file operations
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(<span class="function"><a href="fopen.html" class="function">fopen()</a></span>, <span class="function"><a href="file_get_contents.html" class="function">file_get_contents()</a></span>, etc...)
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are called without a context parameter. Options for the default context
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can optionally be specified with this function using the same syntax as
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<span class="function"><a href="stream_context_create.html" class="function">stream_context_create()</a></span>.
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</p>
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</div>
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<div class="refsect1 parameters" id="refsect1-function.stream-context-get-default-parameters">
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<h3 class="title">参数</h3>
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<p class="para">
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<dl>
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<dt>
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<code class="parameter">options</code></dt>
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<dd>
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<span class="simpara">
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<code class="parameter">options</code> must be an associative
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array of associative arrays in the format
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<em>$arr['wrapper']['option'] = $value</em>.
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</span>
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<blockquote class="note"><p><strong class="note">Note</strong>:
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<p class="para">
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As of PHP 5.3.0, the <span class="function"><a href="stream_context_set_default.html" class="function">stream_context_set_default()</a></span> function
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can be used to set the default context.
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</p>
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</p></blockquote>
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</dd>
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</dl>
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</p>
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</div>
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<div class="refsect1 returnvalues" id="refsect1-function.stream-context-get-default-returnvalues">
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<h3 class="title">返回值</h3>
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<p class="para">
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A stream context <span class="type"><a href="language.types.resource.html" class="type resource">resource</a></span>.
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</p>
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</div>
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<div class="refsect1 examples" id="refsect1-function.stream-context-get-default-examples">
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<h3 class="title">范例</h3>
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<p class="para">
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<div class="example" id="example-4814">
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<p><strong>Example #1 Using <span class="function"><strong>stream_context_get_default()</strong></span></strong></p>
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<div class="example-contents">
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<div class="phpcode"><pre><span style="color: #000000">
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<span style="color: #0000BB"><?php<br />$default_opts </span><span style="color: #007700">= array(<br /> </span><span style="color: #DD0000">'http'</span><span style="color: #007700">=>array(<br /> </span><span style="color: #DD0000">'method'</span><span style="color: #007700">=></span><span style="color: #DD0000">"GET"</span><span style="color: #007700">,<br /> </span><span style="color: #DD0000">'header'</span><span style="color: #007700">=></span><span style="color: #DD0000">"Accept-language: en\r\n" </span><span style="color: #007700">.<br /> </span><span style="color: #DD0000">"Cookie: foo=bar"</span><span style="color: #007700">,<br /> </span><span style="color: #DD0000">'proxy'</span><span style="color: #007700">=></span><span style="color: #DD0000">"tcp://10.54.1.39:8000"<br /> </span><span style="color: #007700">)<br />);<br /><br /><br /></span><span style="color: #0000BB">$alternate_opts </span><span style="color: #007700">= array(<br /> </span><span style="color: #DD0000">'http'</span><span style="color: #007700">=>array(<br /> </span><span style="color: #DD0000">'method'</span><span style="color: #007700">=></span><span style="color: #DD0000">"POST"</span><span style="color: #007700">,<br /> </span><span style="color: #DD0000">'header'</span><span style="color: #007700">=></span><span style="color: #DD0000">"Content-type: application/x-www-form-urlencoded\r\n" </span><span style="color: #007700">.<br /> </span><span style="color: #DD0000">"Content-length: " </span><span style="color: #007700">. </span><span style="color: #0000BB">strlen</span><span style="color: #007700">(</span><span style="color: #DD0000">"baz=bomb"</span><span style="color: #007700">),<br /> </span><span style="color: #DD0000">'content'</span><span style="color: #007700">=></span><span style="color: #DD0000">"baz=bomb"<br /> </span><span style="color: #007700">)<br />);<br /><br /></span><span style="color: #0000BB">$default </span><span style="color: #007700">= </span><span style="color: #0000BB">stream_context_get_default</span><span style="color: #007700">(</span><span style="color: #0000BB">$default_opts</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">$alternate </span><span style="color: #007700">= </span><span style="color: #0000BB">stream_context_create</span><span style="color: #007700">(</span><span style="color: #0000BB">$alternate_opts</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">/* Sends a regular GET request to proxy server at 10.54.1.39<br /> * For www.example.com using context options specified in $default_opts<br /> */<br /></span><span style="color: #0000BB">readfile</span><span style="color: #007700">(</span><span style="color: #DD0000">'http://www.example.com'</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">/* Sends a POST request directly to www.example.com<br /> * Using context options specified in $alternate_opts<br /> */<br /></span><span style="color: #0000BB">readfile</span><span style="color: #007700">(</span><span style="color: #DD0000">'http://www.example.com'</span><span style="color: #007700">, </span><span style="color: #0000BB">false</span><span style="color: #007700">, </span><span style="color: #0000BB">$alternate</span><span style="color: #007700">);<br /><br /></span><span style="color: #0000BB">?></span>
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</span>
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</pre></div>
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</div>
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</div>
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</p>
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</div>
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<div class="refsect1 seealso" id="refsect1-function.stream-context-get-default-seealso">
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<h3 class="title">参见</h3>
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<p class="para">
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<ul class="simplelist">
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<li class="member"><span class="function"><a href="stream_context_create.html" class="function" rel="rdfs-seeAlso">stream_context_create()</a> - 创建资源流上下文</span></li>
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<li class="member">Listing of supported wrappers with context options (<a href="wrappers.html" class="xref">支持的协议和封装协议</a>).</li>
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</ul>
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</p>
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</div>
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</div></div></div></body></html> |