<HTML ><HEAD ><TITLE >gzcompress</TITLE ><META NAME="GENERATOR" CONTENT="Modular DocBook HTML Stylesheet Version 1.7"><LINK REL="HOME" TITLE="PHP Manual" HREF="index.html"><LINK REL="UP" TITLE="Zlib Compression Functions" HREF="ref.zlib.html"><LINK REL="PREVIOUS" TITLE="gzclose" HREF="function.gzclose.html"><LINK REL="NEXT" TITLE="gzdeflate" HREF="function.gzdeflate.html"><META HTTP-EQUIV="Content-type" CONTENT="text/html; charset=ISO-8859-1"></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 Manual</TH ></TR ><TR ><TD WIDTH="10%" ALIGN="left" VALIGN="bottom" ><A HREF="function.gzclose.html" ACCESSKEY="P" >Prev</A ></TD ><TD WIDTH="80%" ALIGN="center" VALIGN="bottom" ></TD ><TD WIDTH="10%" ALIGN="right" VALIGN="bottom" ><A HREF="function.gzdeflate.html" ACCESSKEY="N" >Next</A ></TD ></TR ></TABLE ><HR ALIGN="LEFT" WIDTH="100%"></DIV ><H1 ><A NAME="function.gzcompress" ></A >gzcompress</H1 ><DIV CLASS="refnamediv" ><A NAME="AEN98945" ></A ><P > (PHP 4 >= 4.0.1)</P >gzcompress -- Compress a string</DIV ><DIV CLASS="refsect1" ><A NAME="AEN98948" ></A ><H2 >Description</H2 >string <B CLASS="methodname" >gzcompress</B > ( string data [, int level])<BR ></BR ><P > This function returns a compressed version of the input <TT CLASS="parameter" ><I >data</I ></TT > using the ZLIB data format, or <TT CLASS="constant" ><B >FALSE</B ></TT > if an error is encountered. The optional parameter <TT CLASS="parameter" ><I >level</I ></TT > can be given as 0 for no compression up to 9 for maximum compression. </P ><P > For details on the ZLIB compression algorithm see the document "<A HREF="http://www.ietf.org/rfc/rfc1950.txt" TARGET="_top" >ZLIB Compressed Data Format Specification version 3.3</A >" (RFC 1950). </P ><DIV CLASS="note" ><BLOCKQUOTE CLASS="note" ><P ><B >Note: </B > This is <SPAN CLASS="emphasis" ><I CLASS="emphasis" >not</I ></SPAN > the same as gzip compression, which includes some header data. See <A HREF="function.gzencode.html" ><B CLASS="function" >gzencode()</B ></A > for gzip compression. </P ></BLOCKQUOTE ></DIV ><P > See also <A HREF="function.gzdeflate.html" ><B CLASS="function" >gzdeflate()</B ></A >, <A HREF="function.gzinflate.html" ><B CLASS="function" >gzinflate()</B ></A >, <A HREF="function.gzuncompress.html" ><B CLASS="function" >gzuncompress()</B ></A >, <A HREF="function.gzencode.html" ><B CLASS="function" >gzencode()</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.gzclose.html" ACCESSKEY="P" >Prev</A ></TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="index.html" ACCESSKEY="H" >Home</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" ><A HREF="function.gzdeflate.html" ACCESSKEY="N" >Next</A ></TD ></TR ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" >gzclose</TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="ref.zlib.html" ACCESSKEY="U" >Up</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" >gzdeflate</TD ></TR ></TABLE ></DIV ></BODY ></HTML >