<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <HTML ><HEAD ><TITLE >strnatcmp</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="String 字符串处理函数" HREF="ref.strings.html"><LINK REL="PREVIOUS" TITLE="strnatcasecmp" HREF="function.strnatcasecmp.html"><LINK REL="NEXT" TITLE="strncasecmp" HREF="function.strncasecmp.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.strnatcasecmp.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.strncasecmp.html" ACCESSKEY="N" >下一页</A ></TD ></TR ></TABLE ><HR ALIGN="LEFT" WIDTH="100%"></DIV ><H1 ><A NAME="function.strnatcmp" ></A >strnatcmp</H1 ><DIV CLASS="refnamediv" ><A NAME="AEN227826" ></A ><P > (PHP 4, PHP 5)</P >strnatcmp -- String comparisons using a "natural order" algorithm </DIV ><DIV CLASS="refsect1" ><A NAME="AEN227829" ></A ><H2 >Description</H2 >int <B CLASS="methodname" >strnatcmp</B > ( string str1, string str2 )<BR ></BR ><P > This function implements a comparison algorithm that orders alphanumeric strings in the way a human being would, this is described as a "natural ordering". An example of the difference between this algorithm and the regular computer string sorting algorithms (used in <A HREF="function.strcmp.html" ><B CLASS="function" >strcmp()</B ></A >) can be seen below: <DIV CLASS="informalexample" ><P ></P ><A NAME="AEN227842" ></A ><TABLE BORDER="0" BGCOLOR="#E0E0E0" CELLPADDING="5" ><TR ><TD ><code><font color="#000000"> <font color="#0000BB"><?php<br />$arr1 </font><font color="#007700">= </font><font color="#0000BB">$arr2 </font><font color="#007700">= array(</font><font color="#DD0000">"img12.png"</font><font color="#007700">, </font><font color="#DD0000">"img10.png"</font><font color="#007700">, </font><font color="#DD0000">"img2.png"</font><font color="#007700">, </font><font color="#DD0000">"img1.png"</font><font color="#007700">);<br />echo </font><font color="#DD0000">"Standard string comparison\n"</font><font color="#007700">;<br /></font><font color="#0000BB">usort</font><font color="#007700">(</font><font color="#0000BB">$arr1</font><font color="#007700">, </font><font color="#DD0000">"strcmp"</font><font color="#007700">);<br /></font><font color="#0000BB">print_r</font><font color="#007700">(</font><font color="#0000BB">$arr1</font><font color="#007700">);<br />echo </font><font color="#DD0000">"\nNatural order string comparison\n"</font><font color="#007700">;<br /></font><font color="#0000BB">usort</font><font color="#007700">(</font><font color="#0000BB">$arr2</font><font color="#007700">, </font><font color="#DD0000">"strnatcmp"</font><font color="#007700">);<br /></font><font color="#0000BB">print_r</font><font color="#007700">(</font><font color="#0000BB">$arr2</font><font color="#007700">);<br /></font><font color="#0000BB">?></font> </font> </code></TD ></TR ></TABLE ><P ></P ></DIV > The code above will generate the following output: <DIV CLASS="informalexample" ><P ></P ><A NAME="AEN227844" ></A ><TABLE BORDER="0" BGCOLOR="#E0E0E0" CELLPADDING="5" ><TR ><TD ><PRE CLASS="screen" >Standard string comparison Array ( [0] => img1.png [1] => img10.png [2] => img12.png [3] => img2.png ) Natural order string comparison Array ( [0] => img1.png [1] => img2.png [2] => img10.png [3] => img12.png )</PRE ></TD ></TR ></TABLE ><P ></P ></DIV > For more information see: Martin Pool's <A HREF="http://sourcefrog.net/projects/natsort/" TARGET="_top" >Natural Order String Comparison</A > page. </P ><P > Similar to other string comparison functions, this one returns < 0 if <CODE CLASS="parameter" >str1</CODE > is less than <CODE CLASS="parameter" >str2</CODE >; > 0 if <CODE CLASS="parameter" >str1</CODE > is greater than <CODE CLASS="parameter" >str2</CODE >, and 0 if they are equal. </P ><P > Note that this comparison is case sensitive. </P ><P > See also <A HREF="function.preg-match.html" ><B CLASS="function" >preg_match()</B ></A >, <A HREF="function.strcasecmp.html" ><B CLASS="function" >strcasecmp()</B ></A >, <A HREF="function.substr.html" ><B CLASS="function" >substr()</B ></A >, <A HREF="function.stristr.html" ><B CLASS="function" >stristr()</B ></A >, <A HREF="function.strcmp.html" ><B CLASS="function" >strcmp()</B ></A >, <A HREF="function.strncmp.html" ><B CLASS="function" >strncmp()</B ></A >, <A HREF="function.strncasecmp.html" ><B CLASS="function" >strncasecmp()</B ></A >, <A HREF="function.strnatcasecmp.html" ><B CLASS="function" >strnatcasecmp()</B ></A >, <A HREF="function.strstr.html" ><B CLASS="function" >strstr()</B ></A >, <A HREF="function.natsort.html" ><B CLASS="function" >natsort()</B ></A > and <A HREF="function.natcasesort.html" ><B CLASS="function" >natcasesort()</B ></A >. </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.strnatcasecmp.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.strncasecmp.html" ACCESSKEY="N" >下一页</A ></TD ></TR ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" >strnatcasecmp</TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="ref.strings.html" ACCESSKEY="U" >上一级</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" >strncasecmp</TD ></TR ></TABLE ></DIV ></BODY ></HTML >