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php-manual-en-4.3.0-2mdk.noarch.rpm

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>mt_rand</H1
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><P
>    (PHP 3&#62;= 3.0.6, PHP 4 )</P
>mt_rand&nbsp;--&nbsp;Generate a better random value</DIV
><DIV
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><H2
>Description</H2
>int <B
CLASS="methodname"
>mt_rand</B
> ( [int min, int max])<BR
></BR
><P
>&#13;     Many random number generators of older libcs have dubious or
     unknown characteristics and are slow. By default, PHP uses the
     libc random number generator with the <A
HREF="function.rand.html"
><B
CLASS="function"
>rand()</B
></A
>
     function.  The <B
CLASS="function"
>mt_rand()</B
> function is a drop-in
     replacement for this.  It uses a random number generator with
     known characteristics using the <A
HREF="http://www.math.keio.ac.jp/~matumoto/emt.html"
TARGET="_top"
>&#13;     Mersenne Twister</A
>, which will produce random numbers that should
     be suitable for seeding some kinds of cryptography (see the home page
     for details) and is four times faster than what the average libc
     provides. 
    </P
><P
>&#13;     If called without the optional <TT
CLASS="parameter"
><I
>min</I
></TT
>,
     <TT
CLASS="parameter"
><I
>max</I
></TT
> arguments <B
CLASS="function"
>mt_rand()</B
>
     returns a pseudo-random value between 0 and
     <TT
CLASS="constant"
><B
>RAND_MAX</B
></TT
>.  If you want a random number
     between 5 and 15 (inclusive), for example, use <TT
CLASS="literal"
>mt_rand
     (5, 15)</TT
>.
    </P
><P
>&#13;     In older versions of PHP, you had to seed the random number generator
     before use with <A
HREF="function.mt-srand.html"
><B
CLASS="function"
>mt_srand()</B
></A
>. Since 4.2.0 this is no
     longer necessary.
    </P
><DIV
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><BLOCKQUOTE
CLASS="note"
><P
><B
>Note: </B
>
      In versions before 3.0.7 the meaning of
      <TT
CLASS="parameter"
><I
>max</I
></TT
> was <TT
CLASS="parameter"
><I
>range</I
></TT
>. To
      get the same results in these versions the short example should
      be <TT
CLASS="literal"
>mt_rand (5, 11)</TT
> to get a random number
      between 5 and 15.
     </P
></BLOCKQUOTE
></DIV
><P
>&#13;     See also <A
HREF="function.mt-srand.html"
><B
CLASS="function"
>mt_srand()</B
></A
>,
     <A
HREF="function.mt-getrandmax.html"
><B
CLASS="function"
>mt_getrandmax()</B
></A
> and
     <A
HREF="function.rand.html"
><B
CLASS="function"
>rand()</B
></A
>.
    </P
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