<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <HTML ><HEAD ><TITLE >substr_replace</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="substr_count" HREF="function.substr-count.html"><LINK REL="NEXT" TITLE="substr" HREF="function.substr.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.substr-count.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.substr.html" ACCESSKEY="N" >下一页</A ></TD ></TR ></TABLE ><HR ALIGN="LEFT" WIDTH="100%"></DIV ><H1 ><A NAME="function.substr-replace" ></A >substr_replace</H1 ><DIV CLASS="refnamediv" ><A NAME="AEN228546" ></A ><P > (PHP 4, PHP 5)</P >substr_replace -- Replace text within a portion of a string</DIV ><DIV CLASS="refsect1" ><A NAME="AEN228549" ></A ><H2 >Description</H2 >mixed <B CLASS="methodname" >substr_replace</B > ( mixed string, string replacement, int start [, int length] )<BR ></BR ><P > <B CLASS="function" >substr_replace()</B > replaces a copy of <CODE CLASS="parameter" >string</CODE > delimited by the <CODE CLASS="parameter" >start</CODE > and (optionally) <CODE CLASS="parameter" >length</CODE > parameters with the string given in <CODE CLASS="parameter" >replacement</CODE >. The result string is returned. If <CODE CLASS="parameter" >string</CODE > is an array then array is returned. </P ><P > If <CODE CLASS="parameter" >start</CODE > is positive, the replacing will begin at the <CODE CLASS="parameter" >start</CODE >'th offset into <CODE CLASS="parameter" >string</CODE >. </P ><P > If <CODE CLASS="parameter" >start</CODE > is negative, the replacing will begin at the <CODE CLASS="parameter" >start</CODE >'th character from the end of <CODE CLASS="parameter" >string</CODE >. </P ><P > If <CODE CLASS="parameter" >length</CODE > is given and is positive, it represents the length of the portion of <CODE CLASS="parameter" >string</CODE > which is to be replaced. If it is negative, it represents the number of characters from the end of <CODE CLASS="parameter" >string</CODE > at which to stop replacing. If it is not given, then it will default to strlen( <CODE CLASS="parameter" >string</CODE > ); i.e. end the replacing at the end of <CODE CLASS="parameter" >string</CODE >. Of course, if <CODE CLASS="parameter" >length</CODE > is zero then this function will have the effect of inserting <CODE CLASS="parameter" >replacement</CODE > into <CODE CLASS="parameter" >string</CODE > at the given <CODE CLASS="parameter" >start</CODE > offset. </P ><P > <TABLE WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" CLASS="EXAMPLE" ><TR ><TD ><DIV CLASS="example" ><A NAME="AEN228592" ></A ><P ><B >例 1. <B CLASS="function" >substr_replace()</B > example</B ></P ><TABLE BORDER="0" BGCOLOR="#E0E0E0" CELLPADDING="5" ><TR ><TD ><code><font color="#000000"> <font color="#0000BB"><?php<br />$var </font><font color="#007700">= </font><font color="#DD0000">'ABCDEFGH:/MNRPQR/'</font><font color="#007700">;<br />echo </font><font color="#DD0000">"Original: $var<hr /></font><font color="#007700">\n</font><font color="#DD0000">"</font><font color="#007700">;<br /><br /></font><font color="#FF8000">/* These two examples replace all of $var with 'bob'. */<br /></font><font color="#007700">echo </font><font color="#0000BB">substr_replace</font><font color="#007700">(</font><font color="#0000BB">$var</font><font color="#007700">, </font><font color="#DD0000">'bob'</font><font color="#007700">, </font><font color="#0000BB">0</font><font color="#007700">) . </font><font color="#DD0000">"<br />\n"</font><font color="#007700">;<br />echo </font><font color="#0000BB">substr_replace</font><font color="#007700">(</font><font color="#0000BB">$var</font><font color="#007700">, </font><font color="#DD0000">'bob'</font><font color="#007700">, </font><font color="#0000BB">0</font><font color="#007700">, </font><font color="#0000BB">strlen</font><font color="#007700">(</font><font color="#0000BB">$var</font><font color="#007700">)) . </font><font color="#DD0000">"<br />\n"</font><font color="#007700">;<br /><br /></font><font color="#FF8000">/* Insert 'bob' right at the beginning of $var. */<br /></font><font color="#007700">echo </font><font color="#0000BB">substr_replace</font><font color="#007700">(</font><font color="#0000BB">$var</font><font color="#007700">, </font><font color="#DD0000">'bob'</font><font color="#007700">, </font><font color="#0000BB">0</font><font color="#007700">, </font><font color="#0000BB">0</font><font color="#007700">) . </font><font color="#DD0000">"<br />\n"</font><font color="#007700">;<br /><br /></font><font color="#FF8000">/* These next two replace 'MNRPQR' in $var with 'bob'. */<br /></font><font color="#007700">echo </font><font color="#0000BB">substr_replace</font><font color="#007700">(</font><font color="#0000BB">$var</font><font color="#007700">, </font><font color="#DD0000">'bob'</font><font color="#007700">, </font><font color="#0000BB">10</font><font color="#007700">, -</font><font color="#0000BB">1</font><font color="#007700">) . </font><font color="#DD0000">"<br />\n"</font><font color="#007700">;<br />echo </font><font color="#0000BB">substr_replace</font><font color="#007700">(</font><font color="#0000BB">$var</font><font color="#007700">, </font><font color="#DD0000">'bob'</font><font color="#007700">, -</font><font color="#0000BB">7</font><font color="#007700">, -</font><font color="#0000BB">1</font><font color="#007700">) . </font><font color="#DD0000">"<br />\n"</font><font color="#007700">;<br /><br /></font><font color="#FF8000">/* Delete 'MNRPQR' from $var. */<br /></font><font color="#007700">echo </font><font color="#0000BB">substr_replace</font><font color="#007700">(</font><font color="#0000BB">$var</font><font color="#007700">, </font><font color="#DD0000">''</font><font color="#007700">, </font><font color="#0000BB">10</font><font color="#007700">, -</font><font color="#0000BB">1</font><font color="#007700">) . </font><font color="#DD0000">"<br />\n"</font><font color="#007700">;<br /></font><font color="#0000BB">?></font> </font> </code></TD ></TR ></TABLE ></DIV ></TD ></TR ></TABLE > </P ><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.str-replace.html" ><B CLASS="function" >str_replace()</B ></A > and <A HREF="function.substr.html" ><B CLASS="function" >substr()</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.substr-count.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.substr.html" ACCESSKEY="N" >下一页</A ></TD ></TR ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" >substr_count</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" >substr</TD ></TR ></TABLE ></DIV ></BODY ></HTML >