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>md5</H1
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><P
> (PHP 3, PHP 4, PHP 5)</P
>md5 -- Calculate the md5 hash of a string</DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN225887"
></A
><H2
>Description</H2
>string <B
CLASS="methodname"
>md5</B
> ( string str [, bool raw_output] )<BR
></BR
><P
> Calculates the MD5 hash of <CODE
CLASS="parameter"
>str</CODE
> using the
<A
HREF="http://www.faqs.org/rfcs/rfc1321"
TARGET="_top"
>RSA Data Security, Inc.
MD5 Message-Digest Algorithm</A
>, and returns that hash.
The hash is a 32-character hexadecimal number. If the optional
<CODE
CLASS="parameter"
>raw_output</CODE
> is set to <TT
CLASS="constant"
><B
>TRUE</B
></TT
>, then the md5 digest
is instead returned in raw binary format with a length of 16.
</P
><DIV
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><P
><B
>注意: </B
>
The optional <CODE
CLASS="parameter"
>raw_output</CODE
> parameter was added in
PHP 5.0.0 and defaults to <TT
CLASS="constant"
><B
>FALSE</B
></TT
>
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><B
>例 1. A <B
CLASS="function"
>md5()</B
> example</B
></P
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><code><font color="#000000">
<font color="#0000BB"><?php<br />$str </font><font color="#007700">= </font><font color="#DD0000">'apple'</font><font color="#007700">;<br /><br />if (</font><font color="#0000BB">md5</font><font color="#007700">(</font><font color="#0000BB">$str</font><font color="#007700">) === </font><font color="#DD0000">'1f3870be274f6c49b3e31a0c6728957f'</font><font color="#007700">) {<br /> echo </font><font color="#DD0000">"Would you like a green or red apple?"</font><font color="#007700">;<br /> exit;<br />}<br /></font><font color="#0000BB">?></font>
</font>
</code></TD
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>
</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
>.
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