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：

? 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 <?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; } }

结果展示：

希望本文所述对大家PHP程序设计有所帮助。