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Forked from mrkmg/genColorCodeFromText.php
Created December 9, 2021 03:24
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Generate a unique color based on text input
<?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;
}
?>
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