<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<HTML
><HEAD
><TITLE
>ctype_alnum</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="Character Type Functions"
HREF="ref.ctype.html"><LINK
REL="NEXT"
TITLE="ctype_alpha"
HREF="function.ctype-alpha.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="ref.ctype.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.ctype-alpha.html"
ACCESSKEY="N"
>下一页</A
></TD
></TR
></TABLE
><HR
ALIGN="LEFT"
WIDTH="100%"></DIV
><H1
><A
NAME="function.ctype-alnum"
></A
>ctype_alnum</H1
><DIV
CLASS="refnamediv"
><A
NAME="AEN23730"
></A
><P
> (PHP 4 >= 4.0.4, PHP 5)</P
>ctype_alnum -- Check for alphanumeric character(s)</DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN23733"
></A
><H2
>说明</H2
>bool <B
CLASS="methodname"
>ctype_alnum</B
> ( string text )<BR
></BR
><P
> Checks if all of the characters in the provided string,
<CODE
CLASS="parameter"
>text</CODE
>, are alphanumeric. In the standard
<TT
CLASS="literal"
>C</TT
> locale letters are just <TT
CLASS="literal"
>[A-Za-z]</TT
>
and the function is equivalent to
<TT
CLASS="literal"
>preg_match('/^[a-z0-9]+$/iD', $text)</TT
>.
</P
></DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN23746"
></A
><H2
>参数</H2
><P
> <P
></P
><DIV
CLASS="variablelist"
><DL
><DT
><CODE
CLASS="parameter"
>text</CODE
></DT
><DD
><P
> The tested string.
</P
></DD
></DL
></DIV
>
</P
></DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN23755"
></A
><H2
>返回值</H2
><P
> Returns <TT
CLASS="constant"
><B
>TRUE</B
></TT
> if every character in <CODE
CLASS="parameter"
>text</CODE
> is either
a letter or a digit, <TT
CLASS="constant"
><B
>FALSE</B
></TT
> otherwise.
</P
></DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN23761"
></A
><H2
>范例</H2
><P
> <TABLE
WIDTH="100%"
BORDER="0"
CELLPADDING="0"
CELLSPACING="0"
CLASS="EXAMPLE"
><TR
><TD
><DIV
CLASS="example"
><A
NAME="AEN23764"
></A
><P
><B
>例 1. A <B
CLASS="function"
>ctype_alnum()</B
> example (using the default locale)</B
></P
><TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
CELLPADDING="5"
><TR
><TD
><code><font color="#000000">
<font color="#0000BB"><?php<br />$strings </font><font color="#007700">= array(</font><font color="#DD0000">'AbCd1zyZ9'</font><font color="#007700">, </font><font color="#DD0000">'foo!#$bar'</font><font color="#007700">);<br />foreach (</font><font color="#0000BB">$strings </font><font color="#007700">as </font><font color="#0000BB">$testcase</font><font color="#007700">) {<br /> if (</font><font color="#0000BB">ctype_alnum</font><font color="#007700">(</font><font color="#0000BB">$testcase</font><font color="#007700">)) {<br /> echo </font><font color="#DD0000">"The string $testcase consists of all letters or digits.</font><font color="#007700">\n</font><font color="#DD0000">"</font><font color="#007700">;<br /> } else {<br /> echo </font><font color="#DD0000">"The string $testcase does not consist of all letters or digits.</font><font color="#007700">\n</font><font color="#DD0000">"</font><font color="#007700">;<br /> }<br />}<br /></font><font color="#0000BB">?></font>
</font>
</code></TD
></TR
></TABLE
><P
>上例将输出：</P
><TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
CELLPADDING="5"
><TR
><TD
><PRE
CLASS="screen"
>The string AbCd1zyZ9 consists of all letters or digits.
The string foo!#$bar does not consist of all letters or digits.</PRE
></TD
></TR
></TABLE
></DIV
></TD
></TR
></TABLE
>
</P
></DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN23770"
></A
><H2
>参见</H2
><P
> <P
></P
><TABLE
BORDER="0"
><TBODY
><TR
><TD
><A
HREF="function.ctype-alpha.html"
><B
CLASS="function"
>ctype_alpha()</B
></A
></TD
></TR
><TR
><TD
><A
HREF="function.ctype-digit.html"
><B
CLASS="function"
>ctype_digit()</B
></A
></TD
></TR
><TR
><TD
><A
HREF="function.setlocale.html"
><B
CLASS="function"
>setlocale()</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="ref.ctype.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.ctype-alpha.html"
ACCESSKEY="N"
>下一页</A
></TD
></TR
><TR
><TD
WIDTH="33%"
ALIGN="left"
VALIGN="top"
>Character Type Functions</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"
>ctype_alpha</TD
></TR
></TABLE
></DIV
></BODY
></HTML
>
