PHP将十六进制颜色值转RGB/RGBA颜色值的方法

16进制的颜色值是从#000000到#FFFFFF，而RBG颜色颜色值是由三组0到255之间的数字组成。十六进制颜色值转RGB颜色值，只需要将十六进制颜色值 # 号后面的每两个值一组转成对应的十进制即可，代码如下：

function hex2rgba($hexColor='#000')
	{
	    $color = str_replace('#','',strtoupper(trim($hexColor)));
	    if(strlen($color)>3){
	        $rgba=array(
	            'r'=>hexdec(substr($color,0,2)),
	            'g'=>hexdec(substr($color,2,2)),
	            'b'=>hexdec(substr($color,4,2)),
				'a'=>0
	        );
	    }else{
	        $rgba=array(
	            'r'=>hexdec(substr($color,0,1). substr($color,0,1)),
	            'g'=>hexdec(substr($color,1,1). substr($color,1,1)),
	            'b'=>hexdec(substr($color,2,1). substr($color,2,1)),
				'a'=>0
	        );
	    }
	    return $rgba;
	}

调用：

print_r(hex2rgba('#f00'))

或

print_r(hex2rgba('#ff0000'))