<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <HTML ><HEAD ><TITLE >chunk_split</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="chr" HREF="function.chr.html"><LINK REL="NEXT" TITLE="convert_cyr_string" HREF="function.convert-cyr-string.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.chr.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.convert-cyr-string.html" ACCESSKEY="N" >下一页</A ></TD ></TR ></TABLE ><HR ALIGN="LEFT" WIDTH="100%"></DIV ><H1 ><A NAME="function.chunk-split" ></A >chunk_split</H1 ><DIV CLASS="refnamediv" ><A NAME="AEN224648" ></A ><P > (PHP 3 >= 3.0.6, PHP 4, PHP 5)</P >chunk_split -- 将字符串分割成小块</DIV ><DIV CLASS="refsect1" ><A NAME="AEN224651" ></A ><H2 >说明</H2 >string <B CLASS="methodname" >chunk_split</B > ( string body [, int chunklen [, string end]] )<BR ></BR ><P > 使用此函数将字符串分割成小块非常有用。例如将 <A HREF="function.base64-encode.html" ><B CLASS="function" >base64_encode()</B ></A > 的输出转换成符合 RFC 2045 语义的字符串。它会在每 <CODE CLASS="parameter" >chunklen</CODE >(默认为 76)个字符后边插入 <CODE CLASS="parameter" >end</CODE >(默认为“\r\n”)。此函数会返回新的字符串,而不会修改原有字符串。 <TABLE WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" CLASS="EXAMPLE" ><TR ><TD ><DIV CLASS="example" ><A NAME="AEN224669" ></A ><P ><B >例 1. <B CLASS="function" >chunk_split()</B > 例子</B ></P ><TABLE BORDER="0" BGCOLOR="#E0E0E0" CELLPADDING="5" ><TR ><TD ><code><font color="#000000"> <font color="#0000BB"><?php<br /></font><font color="#FF8000">// 使用 RFC 2045 语义格式化 $data<br /></font><font color="#0000BB">$new_string </font><font color="#007700">= </font><font color="#0000BB">chunk_split</font><font color="#007700">(</font><font color="#0000BB">base64_encode</font><font color="#007700">(</font><font color="#0000BB">$data</font><font color="#007700">));<br /></font><font color="#0000BB">?></font> </font> </code></TD ></TR ></TABLE ></DIV ></TD ></TR ></TABLE > </P ><P > 参见 <A HREF="function.str-split.html" ><B CLASS="function" >str_split()</B ></A >,<A HREF="function.explode.html" ><B CLASS="function" >explode()</B ></A >,<A HREF="function.split.html" ><B CLASS="function" >split()</B ></A >,<A HREF="function.wordwrap.html" ><B CLASS="function" >wordwrap()</B ></A > 和 <A HREF="http://www.faqs.org/rfcs/rfc2045" TARGET="_top" >RFC 2045</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.chr.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.convert-cyr-string.html" ACCESSKEY="N" >下一页</A ></TD ></TR ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" >chr</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" >convert_cyr_string</TD ></TR ></TABLE ></DIV ></BODY ></HTML >