php实现图片局部打马赛克的方法

<?php?
/** 图片局部打马赛克
* @param? String? $source 原图
* @param? Stirng? $dest?? 生成的图片
* @param? int???? $x1???? 起点横坐标
* @param? int???? $y1???? 起点纵坐标
* @param? int???? $x2???? 终点横坐标
* @param? int???? $y2???? 终点纵坐标
* @param? int???? $deep?? 深度,数字越大越模糊
* @return boolean
*/?
function imageMosaics($source,$dest,$x1,$y1,$x2,$y2,$deep){?
?
??? // 判断原图是否存在?
??? if(!file_exists($source)){?
??????? return false;?
??? }?
?
??? // 获取原图信息?
??? list($owidth,$oheight,$otype) = getimagesize($source);?
?
??? // 判断区域是否超出图片?
??? if($x1>$owidth || $x1<0 || $x2>$owidth || $x2<0 || $y1>$oheight || $y1<0 || $y2>$oheight || $y2<0){?
??????? return false;?
??? }?
?
??? switch($otype){?
??????? case 1: $source_img = imagecreatefromgif($source); break;?
??????? case 2: $source_img = imagecreatefromjpeg($source); break;?
??????? case 3: $source_img = imagecreatefrompng($source); break;?
??????? default:?
??????????? return false;?
??? }?
?
??? // 打马赛克?
??? for($x=$x1; $x<$x2; $x=$x+$deep){?
??????? for($y=$y1; $y<$y2; $y=$y+$deep){?
??????????? $color = imagecolorat($source_img,$x+round($deep/2),$y+round($deep/2));?
??????????? imagefilledrectangle($source_img,$x,$y,$x+$deep,$y+$deep,$color);?
??????? }?
??? }?
?
??? // 生成图片?
??? switch($otype){?
??????? case 1: imagegif($source_img,$dest); break;?
??????? case 2: imagejpeg($source_img,$dest); break;?
??????? case 3: imagepng($source_img,$dest); break;?
??? }?
?
??? return is_file($dest)? true : false;?
?
}?
?
$source = 'source.jpg';?
$dest = 'dest.jpg';?
?
$flag = imageMosaics($source,176,98,273,197,4);?
echo '<img src="'.$source.'">';?
echo '<img src="'.$dest.'">';?
?>