<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <HTML ><HEAD ><TITLE >ctype_xdigit</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="Character Type Functions" HREF="ref.ctype.html"><LINK REL="PREVIOUS" TITLE="ctype_upper" HREF="function.ctype-upper.html"><LINK REL="NEXT" TITLE="CURL, Client URL Library Functions" HREF="ref.curl.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.ctype-upper.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="ref.curl.html" ACCESSKEY="N" >下一页</A ></TD ></TR ></TABLE ><HR ALIGN="LEFT" WIDTH="100%"></DIV ><H1 ><A NAME="function.ctype-xdigit" ></A >ctype_xdigit</H1 ><DIV CLASS="refnamediv" ><A NAME="AEN24208" ></A ><P > (PHP 4 >= 4.0.4, PHP 5)</P >ctype_xdigit -- Check for character(s) representing a hexadecimal digit </DIV ><DIV CLASS="refsect1" ><A NAME="AEN24211" ></A ><H2 >说明</H2 >bool <B CLASS="methodname" >ctype_xdigit</B > ( string text )<BR ></BR ><P > Checks if all of the characters in the provided string, <CODE CLASS="parameter" >text</CODE >, are hexadecimal 'digits'. </P ></DIV ><DIV CLASS="refsect1" ><A NAME="AEN24221" ></A ><H2 >参数</H2 ><P > <P ></P ><DIV CLASS="variablelist" ><DL ><DT ><CODE CLASS="parameter" >text</CODE ></DT ><DD ><P > The tested string. </P ></DD ></DL ></DIV > </P ></DIV ><DIV CLASS="refsect1" ><A NAME="AEN24230" ></A ><H2 >返回值</H2 ><P > Returns <TT CLASS="constant" ><B >TRUE</B ></TT > if every character in <CODE CLASS="parameter" >text</CODE > is a hexadecimal 'digit', that is a decimal digit or a character from <TT CLASS="literal" >[A-Fa-f]</TT > , <TT CLASS="constant" ><B >FALSE</B ></TT > otherwise. </P ></DIV ><DIV CLASS="refsect1" ><A NAME="AEN24237" ></A ><H2 >范例</H2 ><P > <TABLE WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" CLASS="EXAMPLE" ><TR ><TD ><DIV CLASS="example" ><A NAME="AEN24240" ></A ><P ><B >例 1. A <B CLASS="function" >ctype_xdigit()</B > example</B ></P ><TABLE BORDER="0" BGCOLOR="#E0E0E0" CELLPADDING="5" ><TR ><TD ><code><font color="#000000"> <font color="#0000BB"><?php<br />$strings </font><font color="#007700">= array(</font><font color="#DD0000">'AB10BC99'</font><font color="#007700">, </font><font color="#DD0000">'AR1012'</font><font color="#007700">, </font><font color="#DD0000">'ab12bc99'</font><font color="#007700">);<br />foreach (</font><font color="#0000BB">$strings </font><font color="#007700">as </font><font color="#0000BB">$testcase</font><font color="#007700">) {<br /> if (</font><font color="#0000BB">ctype_xdigit</font><font color="#007700">(</font><font color="#0000BB">$testcase</font><font color="#007700">)) {<br /> echo </font><font color="#DD0000">"The string $testcase consists of all hexadecimal digits.</font><font color="#007700">\n</font><font color="#DD0000">"</font><font color="#007700">;<br /> } else {<br /> echo </font><font color="#DD0000">"The string $testcase does not consist of all hexadecimal digits.</font><font color="#007700">\n</font><font color="#DD0000">"</font><font color="#007700">;<br /> }<br />}<br /></font><font color="#0000BB">?></font> </font> </code></TD ></TR ></TABLE ><P >上例将输出:</P ><TABLE BORDER="0" BGCOLOR="#E0E0E0" CELLPADDING="5" ><TR ><TD ><PRE CLASS="screen" >The string AB10BC99 consists of all hexadecimal digits. The string AR1012 does not consist of all hexadecimal digits. The string ab12bc99 consists of all hexadecimal digits.</PRE ></TD ></TR ></TABLE ></DIV ></TD ></TR ></TABLE > </P ></DIV ><DIV CLASS="refsect1" ><A NAME="AEN24246" ></A ><H2 >参见</H2 ><P > <P ></P ><TABLE BORDER="0" ><TBODY ><TR ><TD ><A HREF="function.ctype-digit.html" ><B CLASS="function" >ctype_digit()</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.ctype-upper.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="ref.curl.html" ACCESSKEY="N" >下一页</A ></TD ></TR ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" >ctype_upper</TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="ref.ctype.html" ACCESSKEY="U" >上一级</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" >CURL, Client URL Library Functions</TD ></TR ></TABLE ></DIV ></BODY ></HTML >