<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <HTML ><HEAD ><TITLE >readline_callback_handler_install</TITLE ><META NAME="GENERATOR" CONTENT="Modular DocBook HTML Stylesheet Version 1.79"><LINK REL="HOME" TITLE="PHP 手册" HREF="index.html"><LINK REL="UP" TITLE="GNU Readline" HREF="ref.readline.html"><LINK REL="PREVIOUS" TITLE="readline_add_history" HREF="function.readline-add-history.html"><LINK REL="NEXT" TITLE="readline_callback_handler_remove" HREF="function.readline-callback-handler-remove.html"><META HTTP-EQUIV="Content-type" CONTENT="text/html; charset=UTF-8"></HEAD ><BODY CLASS="refentry" BGCOLOR="#FFFFFF" TEXT="#000000" LINK="#0000FF" VLINK="#840084" ALINK="#0000FF" ><DIV CLASS="NAVHEADER" ><TABLE SUMMARY="Header navigation table" WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" ><TR ><TH COLSPAN="3" ALIGN="center" >PHP 手册</TH ></TR ><TR ><TD WIDTH="10%" ALIGN="left" VALIGN="bottom" ><A HREF="function.readline-add-history.html" ACCESSKEY="P" >上一页</A ></TD ><TD WIDTH="80%" ALIGN="center" VALIGN="bottom" ></TD ><TD WIDTH="10%" ALIGN="right" VALIGN="bottom" ><A HREF="function.readline-callback-handler-remove.html" ACCESSKEY="N" >下一页</A ></TD ></TR ></TABLE ><HR ALIGN="LEFT" WIDTH="100%"></DIV ><H1 ><A NAME="function.readline-callback-handler-install" ></A >readline_callback_handler_install</H1 ><DIV CLASS="refnamediv" ><A NAME="AEN196884" ></A ><P > (PHP 5 >= 5.1.0RC1)</P >readline_callback_handler_install -- Initializes the readline callback interface and terminal, prints the prompt and returns immediately</DIV ><DIV CLASS="refsect1" ><A NAME="AEN196887" ></A ><H2 >说明</H2 >bool <B CLASS="methodname" >readline_callback_handler_install</B > ( string prompt, callback callback )<BR ></BR ><P > Sets up a readline callback interface then prints <CODE CLASS="parameter" >prompt</CODE > and immediately returns. Calling this function twice without removing the previous callback interface will automatically and conveniently overwrite the old interface. </P ><P > The callback feature is useful when combined with <A HREF="function.stream-select.html" ><B CLASS="function" >stream_select()</B ></A > as it allows interleaving of IO and user input, unlike <A HREF="function.readline.html" ><B CLASS="function" >readline()</B ></A >. </P ></DIV ><DIV CLASS="refsect1" ><A NAME="AEN196903" ></A ><H2 >参数</H2 ><P > <P ></P ><DIV CLASS="variablelist" ><DL ><DT ><CODE CLASS="parameter" >prompt</CODE ></DT ><DD ><P > The prompt message. </P ></DD ><DT ><CODE CLASS="parameter" >callback</CODE ></DT ><DD ><P > The <CODE CLASS="parameter" >callback</CODE > function takes one parameter; the user input returned. </P ></DD ></DL ></DIV > </P ></DIV ><DIV CLASS="refsect1" ><A NAME="AEN196918" ></A ><H2 >返回值</H2 ><P > 如果成功则返回 <TT CLASS="constant" ><B >TRUE</B ></TT >,失败则返回 <TT CLASS="constant" ><B >FALSE</B ></TT >。 </P ></DIV ><DIV CLASS="refsect1" ><A NAME="AEN196923" ></A ><H2 >范例</H2 ><P > <TABLE WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" CLASS="EXAMPLE" ><TR ><TD ><DIV CLASS="example" ><A NAME="AEN196926" ></A ><P ><B >例 1. Readline Callback Interface Example</B ></P ><TABLE BORDER="0" BGCOLOR="#E0E0E0" CELLPADDING="5" ><TR ><TD ><code><font color="#000000"> <font color="#0000BB"><?php<br /></font><font color="#007700">function </font><font color="#0000BB">rl_callback</font><font color="#007700">(</font><font color="#0000BB">$ret</font><font color="#007700">)<br />{<br /> global </font><font color="#0000BB">$c</font><font color="#007700">, </font><font color="#0000BB">$prompting</font><font color="#007700">;<br /><br /> echo </font><font color="#DD0000">"You entered: $ret</font><font color="#007700">\n</font><font color="#DD0000">"</font><font color="#007700">;<br /> </font><font color="#0000BB">$c</font><font color="#007700">++;<br /><br /> if (</font><font color="#0000BB">$c </font><font color="#007700">> </font><font color="#0000BB">10</font><font color="#007700">) {<br /> </font><font color="#0000BB">$prompting </font><font color="#007700">= </font><font color="#0000BB">false</font><font color="#007700">;<br /> </font><font color="#0000BB">readline_callback_handler_remove</font><font color="#007700">();<br /> } else {<br /> </font><font color="#0000BB">readline_callback_handler_install</font><font color="#007700">(</font><font color="#DD0000">"</font><font color="#007700">[</font><font color="#DD0000">$c</font><font color="#007700">]</font><font color="#DD0000"> Enter something: "</font><font color="#007700">, </font><font color="#DD0000">'rl_callback'</font><font color="#007700">);<br /> }<br />}<br /><br /></font><font color="#0000BB">$c </font><font color="#007700">= </font><font color="#0000BB">1</font><font color="#007700">;<br /></font><font color="#0000BB">$prompting </font><font color="#007700">= </font><font color="#0000BB">true</font><font color="#007700">;<br /><br /></font><font color="#0000BB">readline_callback_handler_install</font><font color="#007700">(</font><font color="#DD0000">"</font><font color="#007700">[</font><font color="#DD0000">$c</font><font color="#007700">]</font><font color="#DD0000"> Enter something: "</font><font color="#007700">, </font><font color="#DD0000">'rl_callback'</font><font color="#007700">);<br /><br />while (</font><font color="#0000BB">$prompting</font><font color="#007700">) {<br /> </font><font color="#0000BB">$w </font><font color="#007700">= </font><font color="#0000BB">NULL</font><font color="#007700">;<br /> </font><font color="#0000BB">$e </font><font color="#007700">= </font><font color="#0000BB">NULL</font><font color="#007700">;<br /> </font><font color="#0000BB">$n </font><font color="#007700">= </font><font color="#0000BB">stream_select</font><font color="#007700">(</font><font color="#0000BB">$r </font><font color="#007700">= array(</font><font color="#0000BB">STDIN</font><font color="#007700">), </font><font color="#0000BB">$w</font><font color="#007700">, </font><font color="#0000BB">$e</font><font color="#007700">, </font><font color="#0000BB">null</font><font color="#007700">);<br /> if (</font><font color="#0000BB">$n </font><font color="#007700">&& </font><font color="#0000BB">in_array</font><font color="#007700">(</font><font color="#0000BB">STDIN</font><font color="#007700">, </font><font color="#0000BB">$r</font><font color="#007700">)) {<br /> </font><font color="#FF8000">// read a character, will call the callback when a newline is entered<br /> </font><font color="#0000BB">readline_callback_read_char</font><font color="#007700">();<br /> }<br />}<br /><br />echo </font><font color="#DD0000">"Prompting disabled. All done.\n"</font><font color="#007700">;<br /></font><font color="#0000BB">?></font> </font> </code></TD ></TR ></TABLE ></DIV ></TD ></TR ></TABLE > </P ></DIV ><DIV CLASS="refsect1" ><A NAME="AEN196929" ></A ><H2 >参见</H2 ><P > <P ></P ><TABLE BORDER="0" ><TBODY ><TR ><TD ><A HREF="function.readline-callback-handler-remove.html" ><B CLASS="function" >readline_callback_handler_remove()</B ></A ></TD ></TR ><TR ><TD ><A HREF="function.readline-callback-read-char.html" ><B CLASS="function" >readline_callback_read_char()</B ></A ></TD ></TR ><TR ><TD ><A HREF="function.stream-select.html" ><B CLASS="function" >stream_select()</B ></A ></TD ></TR ></TBODY ></TABLE ><P ></P > </P ></DIV ><DIV CLASS="NAVFOOTER" ><HR ALIGN="LEFT" WIDTH="100%"><TABLE SUMMARY="Footer navigation table" WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" ><A HREF="function.readline-add-history.html" ACCESSKEY="P" >上一页</A ></TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="index.html" ACCESSKEY="H" >起始页</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" ><A HREF="function.readline-callback-handler-remove.html" ACCESSKEY="N" >下一页</A ></TD ></TR ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" >readline_add_history</TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="ref.readline.html" ACCESSKEY="U" >上一级</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" >readline_callback_handler_remove</TD ></TR ></TABLE ></DIV ></BODY ></HTML >