<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <HTML ><HEAD ><TITLE >strtolower</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="strtok" HREF="function.strtok.html"><LINK REL="NEXT" TITLE="strtoupper" HREF="function.strtoupper.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.strtok.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.strtoupper.html" ACCESSKEY="N" >下一页</A ></TD ></TR ></TABLE ><HR ALIGN="LEFT" WIDTH="100%"></DIV ><H1 ><A NAME="function.strtolower" ></A >strtolower</H1 ><DIV CLASS="refnamediv" ><A NAME="AEN228301" ></A ><P > (PHP 3, PHP 4, PHP 5)</P >strtolower -- Make a string lowercase</DIV ><DIV CLASS="refsect1" ><A NAME="AEN228304" ></A ><H2 >Description</H2 >string <B CLASS="methodname" >strtolower</B > ( string str )<BR ></BR ><P > Returns <CODE CLASS="parameter" >string</CODE > with all alphabetic characters converted to lowercase. </P ><P > Note that 'alphabetic' is determined by the current locale. This means that in i.e. the default "C" locale, characters such as umlaut-A (Ä) will not be converted. </P ><TABLE WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" CLASS="EXAMPLE" ><TR ><TD ><DIV CLASS="example" ><A NAME="AEN228315" ></A ><P ><B >例 1. <B CLASS="function" >strtolower()</B > example</B ></P ><TABLE BORDER="0" BGCOLOR="#E0E0E0" CELLPADDING="5" ><TR ><TD ><code><font color="#000000"> <font color="#0000BB"><?php<br />$str </font><font color="#007700">= </font><font color="#DD0000">"Mary Had A Little Lamb and She LOVED It So"</font><font color="#007700">;<br /></font><font color="#0000BB">$str </font><font color="#007700">= </font><font color="#0000BB">strtolower</font><font color="#007700">(</font><font color="#0000BB">$str</font><font color="#007700">);<br />echo </font><font color="#0000BB">$str</font><font color="#007700">; </font><font color="#FF8000">// Prints mary had a little lamb and she loved it so<br /></font><font color="#0000BB">?></font> </font> </code></TD ></TR ></TABLE ></DIV ></TD ></TR ></TABLE ><DIV CLASS="note" ><BLOCKQUOTE CLASS="note" ><P ><B >注意: </B >本函数可安全用于二进制对象。</P ></BLOCKQUOTE ></DIV ><P > See also <A HREF="function.strtoupper.html" ><B CLASS="function" >strtoupper()</B ></A >, <A HREF="function.ucfirst.html" ><B CLASS="function" >ucfirst()</B ></A >, <A HREF="function.ucwords.html" ><B CLASS="function" >ucwords()</B ></A > and <A HREF="function.mb-strtolower.html" ><B CLASS="function" >mb_strtolower()</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.strtok.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.strtoupper.html" ACCESSKEY="N" >下一页</A ></TD ></TR ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" >strtok</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" >strtoupper</TD ></TR ></TABLE ></DIV ></BODY ></HTML >