用php调用graphviz轻松画拓扑图

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wget http://www.graphviz.org/graphviz-rhel.repo /etc/yum.repos.d/graphviz-rhel.repo    

yum install graphviz

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<?php    

   header ("Expires: Mon, 26 Jul 1997 05:00:00 GMT"); // Date in the past    

   header ("Last-Modified: " . gmdate("D, d M Y H:i:s") . " GMT"); // always modified    

   header ("Cache-Control: no-cache, must-revalidate"); // HTTP/1.1    

   header ("Pragma: no-cache"); // HTTP/1.0    

   header ("Content-type: image/gif");    

   $filename = '/tmp/domain.txt';    

   $somecontent = "digraph G {a->b->c->a}";    

    if (!$handle = fopen($filename, 'w')) {    

         echo "cannot open $filename";    

         exit;    

    }    

    if (fwrite($handle, $somecontent) === FALSE) {    

        echo "cannot write to $filename";    

        exit;    

    }    

    fclose($handle);    

   passthru("dot -Tpng $filename");    

// passthru("cat $filename | dot -Tpng");    

?>