hexdec("FFDDAA"); // returns 16768426
Convert an Integer to Hex
sprintf("%06X", 65280); // returns 00FF00Can be used as a random color generator:
// get a random color (between 000000 and ffffff) function randomColor() { return sprintf("%06X", rand(0, 16777215)); }
Get RGB Decimal values from Hex
$color = "34BB21"; $r = hexdec(substr($color, 0, 2)); // 52 $g = hexdec(substr($color, 2, 2)); // 187 $b = hexdec(substr($color, 4, 2)); // 33
And as a bonus.... RGB Hex validation
preg_match('/^[[:xdigit:]]{6}$/', $color);For example:
function validate($color) { return (bool)preg_match('/^[[:xdigit:]]{6}$/', $color); } $tests = array( 'asdfee', '123455', 'DEAD12', 'fde888', 'gde888', 'ffee', 'blaarg' ); foreach ($tests as $test) { print $test . "\t" . (validate($test) ? 'valid' : 'invalid') . "\n"; } /* Outputs asdfee invalid 123455 valid DEAD12 valid fde888 valid gde888 invalid ffee invalid blaarg invalid */
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