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* make better seeds in mt_srand/srand examples
git-svn-id: https://svn.php.net/repository/phpdoc/en/trunk@57865 c90b9560-bf6c-de11-be94-00142212c4b1
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1 changed files with 13 additions and 5 deletions
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@ -1,5 +1,5 @@
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<?xml encoding="iso-8859-1"?>
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<!-- $Revision: 1.51 $ -->
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<!-- $Revision: 1.52 $ -->
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<reference id="ref.math">
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<title>Mathematical Functions</title>
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<titleabbrev>Math</titleabbrev>
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@ -794,8 +794,12 @@ var_dump(hexdec("a0"));
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<parameter>seed</parameter>.
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<informalexample>
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<programlisting role="php">
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// seed with microseconds since last "whole" second
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mt_srand ((float) microtime() * 1000000);
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// seed with microseconds
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function make_seed() {
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list($usec,$sec) = explode(" ", microtime());
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return ((double)$sec+(double)$usec) * 100000;
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}
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mt_srand(make_seed());
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$randval = mt_rand();
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</programlisting>
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</informalexample>
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@ -1223,8 +1227,12 @@ $foo = round(1241757, -3); // $foo == 1242000
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<parameter>seed</parameter>.
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<informalexample>
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<programlisting role="php">
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// seed with microseconds since last "whole" second
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srand ((float) microtime() * 1000000);
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// seed with microseconds
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function make_seed() {
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list($usec,$sec) = explode(" ", microtime());
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return ((double)$sec+(double)$usec) * 100000;
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}
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srand(make_seed());
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$randval = rand();
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</programlisting>
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</informalexample>
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