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106 lines
8.9 KiB
HTML
106 lines
8.9 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>初始化一个 readline 回调接口，然后终端输出提示信息并立即返回</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.readline-callback-handler-install" class="refentry">
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<div class="refnamediv">
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<h1 class="refname">readline_callback_handler_install</h1>
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<p class="verinfo">(PHP 5 >= 5.1.0, PHP 7)</p><p class="refpurpose"><span class="refname">readline_callback_handler_install</span> — <span class="dc-title">初始化一个 readline 回调接口，然后终端输出提示信息并立即返回</span></p>
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</div>
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<div class="refsect1 description" id="refsect1-function.readline-callback-handler-install-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>readline_callback_handler_install</strong></span>
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( <span class="methodparam"><span class="type">string</span> <code class="parameter">$prompt</code></span>
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, <span class="methodparam"><span class="type"><a href="language.types.callable.html" class="type callable">callable</a></span> <code class="parameter">$callback</code></span>
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) : <span class="type">bool</span></div>
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<p class="para rdfs-comment">
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设置一个 readline 回调接口然后输出 <code class="parameter">prompt</code> 并立即返回.
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第二次调用这个函数不需要移除上一个回调接口，这个函数将自动覆盖旧的接口.
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</p>
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<p class="para">
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当配合 <span class="function"><a href="stream_select.html" class="function">stream_select()</a></span> 时回调的特性非常有用，它允许在 IO 与用户输入
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间交叉进行，不像<span class="function"><a href="readline.html" class="function">readline()</a></span>.
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</p>
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</div>
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<div class="refsect1 parameters" id="refsect1-function.readline-callback-handler-install-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">prompt</code></dt>
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<dd>
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<p class="para">
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提示信息.
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</p>
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</dd>
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<dt>
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<code class="parameter">callback</code></dt>
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<dd>
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<p class="para">
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<code class="parameter">callback</code> 函数需要一个参数; 用户输入将被返回.
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</p>
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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.readline-callback-handler-install-returnvalues">
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<h3 class="title">返回值</h3>
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<p class="para">
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成功时返回 <strong><code>TRUE</code></strong>， 或者在失败时返回 <strong><code>FALSE</code></strong>。
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</p>
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</div>
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<div class="refsect1 description" id="refsect1-function.readline-callback-handler-install-description">
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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-693">
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<p><strong>Example #1 Readline Callback Interface Example</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 /></span><span style="color: #007700">function </span><span style="color: #0000BB">rl_callback</span><span style="color: #007700">(</span><span style="color: #0000BB">$ret</span><span style="color: #007700">)<br />{<br /> global </span><span style="color: #0000BB">$c</span><span style="color: #007700">, </span><span style="color: #0000BB">$prompting</span><span style="color: #007700">;<br /><br /> echo </span><span style="color: #DD0000">"You entered: </span><span style="color: #0000BB">$ret</span><span style="color: #DD0000">\n"</span><span style="color: #007700">;<br /> </span><span style="color: #0000BB">$c</span><span style="color: #007700">++;<br /><br /> if (</span><span style="color: #0000BB">$c </span><span style="color: #007700">> </span><span style="color: #0000BB">10</span><span style="color: #007700">) {<br /> </span><span style="color: #0000BB">$prompting </span><span style="color: #007700">= </span><span style="color: #0000BB">false</span><span style="color: #007700">;<br /> </span><span style="color: #0000BB">readline_callback_handler_remove</span><span style="color: #007700">();<br /> } else {<br /> </span><span style="color: #0000BB">readline_callback_handler_install</span><span style="color: #007700">(</span><span style="color: #DD0000">"[</span><span style="color: #0000BB">$c</span><span style="color: #DD0000">] Enter something: "</span><span style="color: #007700">, </span><span style="color: #DD0000">'rl_callback'</span><span style="color: #007700">);<br /> }<br />}<br /><br /></span><span style="color: #0000BB">$c </span><span style="color: #007700">= </span><span style="color: #0000BB">1</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">$prompting </span><span style="color: #007700">= </span><span style="color: #0000BB">true</span><span style="color: #007700">;<br /><br /></span><span style="color: #0000BB">readline_callback_handler_install</span><span style="color: #007700">(</span><span style="color: #DD0000">"[</span><span style="color: #0000BB">$c</span><span style="color: #DD0000">] Enter something: "</span><span style="color: #007700">, </span><span style="color: #DD0000">'rl_callback'</span><span style="color: #007700">);<br /><br />while (</span><span style="color: #0000BB">$prompting</span><span style="color: #007700">) {<br /> </span><span style="color: #0000BB">$w </span><span style="color: #007700">= </span><span style="color: #0000BB">NULL</span><span style="color: #007700">;<br /> </span><span style="color: #0000BB">$e </span><span style="color: #007700">= </span><span style="color: #0000BB">NULL</span><span style="color: #007700">;<br /> </span><span style="color: #0000BB">$n </span><span style="color: #007700">= </span><span style="color: #0000BB">stream_select</span><span style="color: #007700">(</span><span style="color: #0000BB">$r </span><span style="color: #007700">= array(</span><span style="color: #0000BB">STDIN</span><span style="color: #007700">), </span><span style="color: #0000BB">$w</span><span style="color: #007700">, </span><span style="color: #0000BB">$e</span><span style="color: #007700">, </span><span style="color: #0000BB">null</span><span style="color: #007700">);<br /> if (</span><span style="color: #0000BB">$n </span><span style="color: #007700">&& </span><span style="color: #0000BB">in_array</span><span style="color: #007700">(</span><span style="color: #0000BB">STDIN</span><span style="color: #007700">, </span><span style="color: #0000BB">$r</span><span style="color: #007700">)) {<br /> </span><span style="color: #FF8000">// read a character, will call the callback when a newline is entered<br /> </span><span style="color: #0000BB">readline_callback_read_char</span><span style="color: #007700">();<br /> }<br />}<br /><br />echo </span><span style="color: #DD0000">"Prompting disabled. All done.\n"</span><span style="color: #007700">;<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.readline-callback-handler-install-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="readline_callback_handler_remove.html" class="function" rel="rdfs-seeAlso">readline_callback_handler_remove()</a> - 移除上一个安装的回调函数句柄并且恢复终端设置</span></li>
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<li class="member"><span class="function"><a href="readline_callback_read_char.html" class="function" rel="rdfs-seeAlso">readline_callback_read_char()</a> - 当一个行被接收时读取一个字符并且通知 readline 调用回调函数</span></li>
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<li class="member"><span class="function"><a href="stream_select.html" class="function" rel="rdfs-seeAlso">stream_select()</a> - Runs the equivalent of the select() system call on the given
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arrays of streams with a timeout specified by tv_sec and tv_usec</span></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> |