<?php
if (! function_exists('adjust_brightness')) {
function adjust_brightness($hex, $steps)
{
$steps = max(-255, min(255, $steps));
$hex = str_replace('#', '', $hex);
if (strlen($hex) == 3) {
$hex = str_repeat(substr($hex,0,1), 2).str_repeat(substr($hex,1,1), 2).str_repeat(substr($hex,2,1), 2);
}
$color_parts = str_split($hex, 2);
$return = '';
foreach ($color_parts as $color) {
$color = hexdec($color);
$color = max(0,min(255,$color + $steps));
$return .= str_pad(dechex($color), 2, '0', STR_PAD_LEFT);
}
return $return;
}
}
?>
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