本文实例讲述了php实现背景图上添加圆形logo图标的方法。分享给大家供大家参考，具体如下：
说一下步骤：
总共分 3 步：
1. 压缩logo 成固定大小的方形图片
2. 将logo 转成圆形logo
3. 将logo与背景图合并
废话不多说，直接上代码：
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<?php
/**
* 作者：friker
* 开发时间：20160516
* 功能：图片处理
*
*/
class ImageController extends CI_Controller{
public function __construct()
{
parent::__construct();
date_default_timezone_set('Asia/Shanghai');
error_reporting( E_ALL&~E_NOTICE&~E_WARNING);
$this->load->library('curl');
}
/**
* @todo : 本函数用于 将方形的图片压缩后
* 再裁减成圆形 做成logo
* 与背景图合并
* @return 返回url
*/
public function index(){
//头像
$headimgurl = 'a.jpg';
//背景图
$bgurl = './aa.png';
$imgs['dst'] = $bgurl;
//第一步 压缩图片
$imggzip = $this->resize_img($headimgurl);
//第二步 裁减成圆角图片
$imgs['src'] = $this->test($imggzip);
//第三步 合并图片
$dest = $this->mergerImg($imgs);
}
public function resize_img($url,$path='./'){
$imgname = $path.uniqid().'.jpg';
$file = $url;
list($width, $height) = getimagesize($file); //获取原图尺寸
$percent = (110/$width);
//缩放尺寸
$newwidth = $width * $percent;
$newheight = $height * $percent;
$src_im = imagecreatefromjpeg($file);
$dst_im = imagecreatetruecolor($newwidth, $newheight);
imagecopyresized($dst_im, $src_im, 0, 0, 0, 0, $newwidth, $newheight, $width, $height);
imagejpeg($dst_im, $imgname); //输出压缩后的图片
imagedestroy($dst_im);
imagedestroy($src_im);
return $imgname;
}
//第一步生成圆角图片
public function test($url,$path='./'){
$w = 110; $h=110; // original size
$original_path= $url;
$dest_path = $path.uniqid().'.png';
$src = imagecreatefromstring(file_get_contents($original_path));
$newpic = imagecreatetruecolor($w,$h);
imagealphablending($newpic,false);
$transparent = imagecolorallocatealpha($newpic, 0, 0, 0, 127);
$r=$w/2;
for($x=0;$x<$w;$x++)
for($y=0;$y<$h;$y++){
$c = imagecolorat($src,$x,$y);
$_x = $x - $w/2;
$_y = $y - $h/2;
if((($_x*$_x) + ($_y*$_y)) < ($r*$r)){
imagesetpixel($newpic,$x,$y,$c);
}else{
imagesetpixel($newpic,$x,$y,$transparent);
}
}
imagesavealpha($newpic, true);
// header('Content-Type: image/png');
imagepng($newpic, $dest_path);
imagedestroy($newpic);
imagedestroy($src);
unlink($url);
return $dest_path;
}
//php 合并图片
public function mergerImg($imgs,$path='./') {
$imgname = $path.rand(1000,9999).uniqid().'.jpg';
list($max_width, $max_height) = getimagesize($imgs['dst']);
$dests = imagecreatetruecolor($max_width, $max_height);
$dst_im = imagecreatefrompng($imgs['dst']);
imagecopy($dests,$dst_im,0,0,0,0,$max_width,$max_height);
imagedestroy($dst_im);
$src_im = imagecreatefrompng($imgs['src']);
$src_info = getimagesize($imgs['src']);
imagecopy($dests,$src_im,270,202,0,0,$src_info[0],$src_info[1]);
imagedestroy($src_im);
// var_dump($imgs);exit;
// header("Content-type: image/jpeg");
imagejpeg($dests,$imgname);
// unlink($imgs['dst']);
unlink($imgs['src']);
return $imgname;
}
}
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结果展示：
希望本文所述对大家PHP程序设计有所帮助。