将十六进制转换为RGB&RGB转换为十六进制

Posted 2021-02-27

<?php
	function HexToRGB($hex) {
		$hex = ereg_replace("#", "", $hex);
		$color = array();
 
		if(strlen($hex) == 3) {
			$color['r'] = hexdec(substr($hex, 0, 1) . $r);
			$color['g'] = hexdec(substr($hex, 1, 1) . $g);
			$color['b'] = hexdec(substr($hex, 2, 1) . $b);
		}
		else if(strlen($hex) == 6) {
			$color['r'] = hexdec(substr($hex, 0, 2));
			$color['g'] = hexdec(substr($hex, 2, 2));
			$color['b'] = hexdec(substr($hex, 4, 2));
		}
 
		return $color;
	}
 
	function RGBToHex($r, $g, $b) {
		//String padding bug found and the solution put forth by Pete Williams (http://snipplr.com/users/PeteW)
		$hex = "#";
		$hex.= str_pad(dechex($r), 2, "0", STR_PAD_LEFT);
		$hex.= str_pad(dechex($g), 2, "0", STR_PAD_LEFT);
		$hex.= str_pad(dechex($b), 2, "0", STR_PAD_LEFT);
 
		return $hex;
	}
?>