Comments on: Random web page background colors

By: rachel jenkins

rachel jenkins — Mon, 06 Feb 2012 04:40:05 +0000

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By: jeremy

jeremy — Wed, 13 Aug 2008 07:32:34 +0000

for 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));

By: jeremy

jeremy — Wed, 13 Aug 2008 07:31:15 +0000

Steve 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.

By: Steve H

Steve H — Sun, 09 Sep 2007 01:40:46 +0000

Handy 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.

By: BlaqueSheepe

BlaqueSheepe — Fri, 18 Aug 2006 13:33:42 +0000

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