ColorUtils.php
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<?php
namespace common\helpers;
/**
* Class ImageUrl
* @package app\wx\helpers
*/
class ColorUtils
{
/**
* RGB转 十六进制
* @param $rgb RGB颜色的字符串 如：rgb(255,255,255);
* @return string 十六进制颜色值 如：#FFFFFF
*/
public static function RGBToHex($rgb)
{
$regexp = "/^rgb\(([0-9]{0,3})\,\s*([0-9]{0,3})\,\s*([0-9]{0,3})\)/";
$re = preg_match($regexp, $rgb, $match);
$re = array_shift($match);
$hexColor = "#";
$hex = array('0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F');
for ($i = 0; $i < 3; $i++) {
$r = null;
$c = $match[$i];
$hexAr = array();
while ($c > 16) {
$r = $c % 16;
$c = ($c / 16) >> 0;
array_push($hexAr, $hex[$r]);
}
array_push($hexAr, $hex[$c]);
$ret = array_reverse($hexAr);
$item = implode('', $ret);
$item = str_pad($item, 2, '0', STR_PAD_LEFT);
$hexColor .= $item;
}
return $hexColor;
}
/**
* 十六进制 转 RGB数组
*/
public static function hex2rgb($hexColor)
{
$color = str_replace('#', '', $hexColor);
if (strlen($color) > 3) {
$rgb = array(
'r' => hexdec(substr($color, 0, 2)),
'g' => hexdec(substr($color, 2, 2)),
'b' => hexdec(substr($color, 4, 2))
);
} else {
$color = $hexColor;
$r = substr($color, 0, 1) . substr($color, 0, 1);
$g = substr($color, 1, 1) . substr($color, 1, 1);
$b = substr($color, 2, 1) . substr($color, 2, 1);
$rgb = array(
'r' => hexdec($r),
'g' => hexdec($g),
'b' => hexdec($b)
);
}
return $rgb;
}
}