function.readline-callback-handler-install.html
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html> <head> <title>Initializes the readline callback interface and terminal, prints the prompt and returns immediately</title> <meta http-equiv="content-type" content="text/html; charset=UTF-8"> </head> <body><div style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="function.readline-add-history.html">readline_add_history</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.readline-callback-handler-remove.html">readline_callback_handler_remove</a></div> <div class="up"><a href="ref.readline.html">Readline Functions</a></div> <div class="home"><a href="index.html">PHP Manual</a></div></div><hr /><div id="function.readline-callback-handler-install" class="refentry"> <div class="refnamediv"> <h1 class="refname">readline_callback_handler_install</h1> <p class="verinfo">(PHP 5 >= 5.1.0)</p><p class="refpurpose"><span class="refname">readline_callback_handler_install</span> — <span class="dc-title">Initializes the readline callback interface and terminal, prints the prompt and returns immediately</span></p> </div> <div class="refsect1 description"> <h3 class="title">Description</h3> <div class="methodsynopsis dc-description"> <span class="type">bool</span> <span class="methodname"><b><b>readline_callback_handler_install</b></b></span> ( <span class="methodparam"><span class="type">string</span> <tt class="parameter">$prompt</tt></span> , <span class="methodparam"><span class="type"><a href="language.pseudo-types.html#language.types.callback" class="type callback">callback</a></span> <tt class="parameter">$callback</tt></span> )</div> <p class="para rdfs-comment"> Sets up a readline callback interface then prints <i><tt class="parameter">prompt</tt></i> and immediately returns. Calling this function twice without removing the previous callback interface will automatically and conveniently overwrite the old interface. </p> <p class="para"> The callback feature is useful when combined with <a href="function.stream-select.html" class="function">stream_select()</a> as it allows interleaving of IO and user input, unlike <a href="function.readline.html" class="function">readline()</a>. </p> </div> <div class="refsect1 parameters"> <h3 class="title">Parameters</h3> <p class="para"> <dl> <dt> <span class="term"><i><tt class="parameter">prompt</tt></i></span> <dd> <p class="para"> The prompt message. </p> </dd> </dt> <dt> <span class="term"><i><tt class="parameter">callback</tt></i></span> <dd> <p class="para"> The <i><tt class="parameter">callback</tt></i> function takes one parameter; the user input returned. </p> </dd> </dt> </dl> </p> </div> <div class="refsect1 returnvalues"> <h3 class="title">Return Values</h3> <p class="para"> Returns <b><tt>TRUE</tt></b> on success or <b><tt>FALSE</tt></b> on failure. </p> </div> <div class="refsect1 description"> <h3 class="title">Examples</h3> <p class="para"> <div class="example"> <p><b>Example #1 Readline Callback Interface Example</b></p> <div class="example-contents"><div class="phpcode"><code><span style="color: #000000"><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: $ret\n"</span><span style="color: #007700">;<br /> </span><span style="color: #0000BB">$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">"[$c] Enter something: "</span><span style="color: #007700">, </span><span style="color: #DD0000">'rl_callback'</span><span style="color: #007700">);<br /> }<br />}<br /><br /></span><span style="color: #0000BB">$c </span><span style="color: #007700">= </span><span style="color: #0000BB">1</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">$prompting </span><span style="color: #007700">= </span><span style="color: #0000BB">true</span><span style="color: #007700">;<br /><br /></span><span style="color: #0000BB">readline_callback_handler_install</span><span style="color: #007700">(</span><span style="color: #DD0000">"[$c] 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></span></code></div> </div> </div> </p> </div> <div class="refsect1 seealso"> <h3 class="title">See Also</h3> <p class="para"> <ul class="simplelist"> <li class="member"><a href="function.readline-callback-handler-remove.html" class="function" rel="rdfs-seeAlso">readline_callback_handler_remove()</a></li> <li class="member"><a href="function.readline-callback-read-char.html" class="function" rel="rdfs-seeAlso">readline_callback_read_char()</a></li> <li class="member"><a href="function.stream-select.html" class="function" rel="rdfs-seeAlso">stream_select()</a></li> </ul> </p> </div></div><hr /><div style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="function.readline-add-history.html">readline_add_history</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.readline-callback-handler-remove.html">readline_callback_handler_remove</a></div> <div class="up"><a href="ref.readline.html">Readline Functions</a></div> <div class="home"><a href="index.html">PHP Manual</a></div></div></body></html>⌨️ 快捷键说明
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