note 103009 added to function.rand

Random is NOT actually random. It is easily illustrated by multiplying rand(1,500) by rand(1,500) and showing the output on the image: <?php header("Content-type: image/png"); $img = imagecreatetruecolor(500,500); $ink = imagecolorallocate($img,255,255,255); for($i=0;$i<500;$i++) { for($j=0;$j<500;$j++) { imagesetpixel($img, rand(1,500), rand(1,500), $ink1); } } imagepng($img); imagedestroy($img); ?> I expected to get pixel noise, but instead one can see plain diagonal lines. ---- Server IP: 213.186.192.247 Probable Submitter: 91.213.119.254 ---- Manual Page -- http://www.php.net/manual/en/function.rand.php Edit -- https://master.php.net/note/edit/103009 Del: integrated -- https://master.php.net/note/delete/103009/integrated Del: useless -- https://master.php.net/note/delete/103009/useless Del: bad code -- https://master.php.net/note/delete/103009/bad+code Del: spam -- https://master.php.net/note/delete/103009/spam Del: non-english -- https://master.php.net/note/delete/103009/non-english Del: in docs -- https://master.php.net/note/delete/103009/in+docs Del: other reasons-- https://master.php.net/note/delete/103009 Reject -- https://master.php.net/note/reject/103009 Search -- https://master.php.net/manage/user-notes.php