If you want to create a random background color
and then you’d use the following in your body tag:
<body BGCOLOR=“#<?php echo($hex);?>”>
Friday, July 14th, 2006
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will this be able to call upon a certain (set of colors) if certain variables are entered. I’m working on a site and i need help for backend coding
on August 18th, 2006 at 8:33 am | #Link CommentHandy code but you have a problem if rand returns 16 or less as the HEX will then only be one character long, breaking the color. You can either choose to str_pad each one like so:
str_pad(dechex(rand(0,255)),1,dechex(rand(0,16)))
or, a bit less bulky, you can just set the lower limit to 17:
dechex(rand(17,255))
That way you don’t get a true random color as the lower values will never come out. But not having the darkest of colors can also work out for the best, especially when using it as a background color.
on September 8th, 2007 at 8:40 pm | #Link CommentSteve is right, but it might be easier to divide it into 6 numbers 0 - F, since only the first zero is the problem, and there’s really no reason to subdivide a six digit number into three groups of two (unless you later want to have the ability to work with individual RGB color values). By concatenating the random one-digit zero, it stays put. I.e., 07 = 7, but 0 = 0 always.
$color = dechex(rand(0,15)).dechex(rand(0,15)).dechex(rand(0,15)).dechex(rand(0,15)).dechex(rand(0,15)).dechex(rand(0,15));
(Note that “15″ is 16 digits including zero, the same way that 255 is 256 incl. zero.)
I’m sure you could further simplify it by dividing it into 1 (0-15) and 5 (0-1048575) digit random numbers.
on August 13th, 2008 at 2:31 am | #Link Commentfor readability:
$color = dechex(rand(0,15)) . dechex(rand(0,15)) . dechex(rand(0,15)) . dechex(rand(0,15)) . dechex(rand(0,15)) . dechex(rand(0,15));
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on February 5th, 2012 at 11:40 pm | #Link Comment