<HTML ><HEAD ><TITLE >md5</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="String functions" HREF="ref.strings.html"><LINK REL="PREVIOUS" TITLE="md5_file" HREF="function.md5-file.html"><LINK REL="NEXT" TITLE="metaphone" HREF="function.metaphone.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.md5-file.html" ACCESSKEY="P" >Prev</A ></TD ><TD WIDTH="80%" ALIGN="center" VALIGN="bottom" ></TD ><TD WIDTH="10%" ALIGN="right" VALIGN="bottom" ><A HREF="function.metaphone.html" ACCESSKEY="N" >Next</A ></TD ></TR ></TABLE ><HR ALIGN="LEFT" WIDTH="100%"></DIV ><H1 ><A NAME="function.md5" ></A >md5</H1 ><DIV CLASS="refnamediv" ><A NAME="AEN90027" ></A ><P > (PHP 3, PHP 4 )</P >md5 -- Calculate the md5 hash of a string</DIV ><DIV CLASS="refsect1" ><A NAME="AEN90030" ></A ><H2 >Description</H2 >string <B CLASS="methodname" >md5</B > ( string str)<BR ></BR ><P > Calculates the MD5 hash of <TT CLASS="parameter" ><I >str</I ></TT > using the <A HREF="http://www.faqs.org/rfcs/rfc1321.html" TARGET="_top" >RSA Data Security, Inc. MD5 Message-Digest Algorithm</A >, and returns that hash. The hash is a 32-character hexadecimal number. </P ><P > See also <A HREF="function.crc32.html" ><B CLASS="function" >crc32()</B ></A >, <A HREF="function.md5-file.html" ><B CLASS="function" >md5_file()</B ></A >, and <A HREF="function.sha1.html" ><B CLASS="function" >sha1()</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.md5-file.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.metaphone.html" ACCESSKEY="N" >Next</A ></TD ></TR ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" >md5_file</TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="ref.strings.html" ACCESSKEY="U" >Up</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" >metaphone</TD ></TR ></TABLE ></DIV ></BODY ></HTML >