Generate a unique color based on text input

genColorCodeFromText.php

<?php
/*
 * Outputs a color (#000000) based Text input
 *
 * @param $text String of text
 * @param $min_brightness Integer between 0 and 100
 * @param $spec Integer between 2-10, determines how unique each color will be
 */

function genColorCodeFromText($text,$min_brightness=100,$spec=10)
{
	// Check inputs
	if(!is_int($min_brightness)) throw new Exception("$min_brightness is not an integer");
	if(!is_int($spec)) throw new Exception("$spec is not an integer");
	if($spec < 2 or $spec > 10) throw new Exception("$spec is out of range");
	if($min_brightness < 0 or $min_brightness > 255) throw new Exception("$min_brightness is out of range");
	
	
	$hash = md5($text);  //Gen hash of text
	$colors = array();
	for($i=0;$i<3;$i++)
		$colors[$i] = max(array(round(((hexdec(substr($hash,$spec*$i,$spec)))/hexdec(str_pad('',$spec,'F')))*255),$min_brightness)); //convert hash into 3 decimal values between 0 and 255
		
	if($min_brightness > 0)  //only check brightness requirements if min_brightness is about 100
		while( array_sum($colors)/3 < $min_brightness )  //loop until brightness is above or equal to min_brightness
			for($i=0;$i<3;$i++)
				$colors[$i] += 10;	//increase each color by 10
				
	$output = '';
	
	for($i=0;$i<3;$i++)
		$output .= str_pad(dechex($colors[$i]),2,0,STR_PAD_LEFT);  //convert each color to hex and append to output
	
	return '#'.$output;
}
?>