php通用修改裁切、圆角、合并图片：
```
<?php
namespace Home\Controller;
use Think\Controller;
class IndexController extends Controller {
/**
* @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 index1(){
//头像
$headimgurl = 'public/log.jpg';
//背景图
$bgurl = 'public/a.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($url,$sizess){
$path='./';
$imgname = $path.uniqid().'.jpg';
$file = $url;
list($width, $height) = getimagesize($file); //获取原图尺寸
$percent = ($sizess/$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 $imgname;
}
//裁切图片
public function resize_jpg($filename,$sizess){
// $percent = 1.5;
list($width, $height) = getimagesize($filename);
$percent = ($sizess/$width);
$new_width = $width * $percent;
$new_height = $height * $percent;
$image_p = imagecreatetruecolor($new_width, $new_height);
$image = imagecreatefromjpeg($filename);
imagecopyresampled($image_p, $image, 0, 0, 0, 0, $new_width, $new_height, $width, $height);
$image_name = time() . '.jpg';
imagejpeg($image_p,$image_name);
imagedestroy($image_p);
imagedestroy($image);
return $image_name;
}
//第一步生成圆角图片
public function test($url,$path='./'){
// $w = 110; $h=110; // original size
list($w, $h) = getimagesize($url); //获取原图尺寸
$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 = $path.rand(1000,9999).time().'.jpg';
list($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']);
print_r($imgname);
//png合并必须使用imagecopy，否则透明部分无法透明
imagecopy($dests,$src_im,500,202,0,0,$src_info[0],$src_info[1]);
imagedestroy($src_im);
imagejpeg($dests,$imgname);
// unlink($imgs['dst']);
unlink($imgs['src']);
return $imgname;
}
public function index(){
$imgname = './'.rand(1000,9999).time().'.jpg';
//头像
$src = 'public/log.jpg';
//背景图
$dst = 'data:image/jpeg;base64,/9j/4AAQSkZJRg';//图片二进制流文件
$dst = 'public/ceshi.jpg';
//得到原始图片信息
$dst_im = $this->imagecretefrom_type($dst);
$dst_info = getimagesize($dst);
//水印图像
$srcs = 'public/log.jpg';
$srcsa = $this->resize_jpg($srcs,660);
$src = $this->yj_img($srcsa);
$src_im = $this->imagecretefrom_type($src);
$src_info = getimagesize($src);
//水印透明度
$alpha = 100;
imagealphablending($src_im, true);
imagesavealpha($src_im, false);
//合并水印图片
imagecopy($dst_im,$src_im,$dst_info[0]/2-$src_info[0]/2,
$dst_info[1]/2-$src_info[1]/2,0,0,$src_info[0],
$src_info[1]
);
header('Content-Type: image/jpeg');
header('Content-Type: image/png');
//输出合并后水印图片
imagejpeg($dst_im,$imgname);
$PSize = filesize($imgname);
$picturedata = fread(fopen($imgname, "r"), $PSize);
imagedestroy($dst_im);
imagedestroy($src_im);
unlink($src);
unlink($srcsa);
echo $picturedata;
}
public function imagecretefrom_type($imgpath){
$ext = pathinfo($imgpath);
$src_img = null;
switch ($ext['extension']) {
case 'jpg':
$src_img = imagecreatefromjpeg($imgpath);
break;
case 'png':
$src_img = imagecreatefrompng($imgpath);
break;
}
return $src_img;
}
public function yj_img($imgpath){
$imgname = rand(1000,9999).uniqid().'.png';
$ext = pathinfo($imgpath);
$src_img = null;
switch ($ext['extension']) {
case 'jpg':
$src_img = imagecreatefromjpeg($imgpath);
break;
case 'png':
$src_img = imagecreatefrompng($imgpath);
break;
}
$wh = getimagesize($imgpath);
$w = $wh[0];
$h = $wh[1];
$w = min($w, $h);
$h = $w;
$img = imagecreatetruecolor($w, $h);
//这一句一定要有
imagesavealpha($img, true);
//拾取一个完全透明的颜色,最后一个参数127为全透明
$bg = imagecolorallocatealpha($img, 255, 255, 255, 127);
imagefill($img, 0, 0, $bg);
$r = $w / 2; //圆半径
$y_x = $r; //圆心X坐标
$y_y = $r; //圆心Y坐标
for ($x = 0; $x < $w; $x++) {
for ($y = 0; $y < $h; $y++) {
$rgbColor = imagecolorat($src_img, $x, $y);
if (((($x - $r) * ($x - $r) + ($y - $r) * ($y - $r)) < ($r * $r))) {
imagesetpixel($img, $x, $y, $rgbColor);
}
}
}
imagesavealpha($img, true);
imagepng($img, $imgname);
imagedestroy($img);
imagedestroy($src_img);
return $imgname;
}
public function curl_post_https($url,$data){ // 模拟提交数据函数
$curl = curl_init(); // 启动一个CURL会话
curl_setopt($curl, CURLOPT_URL, $url); // 要访问的地址
curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, 0); // 对认证证书来源的检查
curl_setopt($curl, CURLOPT_SSL_VERIFYHOST, 1); // 从证书中检查SSL加密算法是否存在
curl_setopt($curl, CURLOPT_USERAGENT, $_SERVER['HTTP_USER_AGENT']); // 模拟用户使用的浏览器
curl_setopt($curl, CURLOPT_FOLLOWLOCATION, 1); // 使用自动跳转
curl_setopt($curl, CURLOPT_AUTOREFERER, 1); // 自动设置Referer
curl_setopt($curl, CURLOPT_POST, 1); // 发送一个常规的Post请求
curl_setopt($curl, CURLOPT_POSTFIELDS, $data); // Post提交的数据包
curl_setopt($curl, CURLOPT_TIMEOUT, 30); // 设置超时限制防止死循环
curl_setopt($curl, CURLOPT_HEADER, 0); // 显示返回的Header区域内容
curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1); // 获取的信息以文件流的形式返回
$tmpInfo = curl_exec($curl); // 执行操作
if (curl_errno($curl)) {
echo 'Errno'.curl_error($curl);//捕抓异常
}
curl_close($curl); // 关闭CURL会话
return $tmpInfo; // 返回数据，json格式
}
public function index2(){
$url = 'https://api.weixin.qq.com/wxa/getwxacodeunlimit?access_token=52_GwppN6xcxomP3F2vufbO-cQCSvH4_W901vq9mE8YrZ_R7Kv-wycOFUpUlAt2dtHtXQ7QChMsvasKJln8D3ob66n_nl7csTbVsfXrwe17duZ3TUcKB_1TL2rQXsr0ehdmQntqzv_S8n89RHd6JMDeAFAQTK';
$arr['page'] = 'pages/index/index';
$arr['scene'] = 'a=1';
$arr['check_path'] = true;
$arr['env_version'] = 'release';
$datas = json_encode($arr);
$data = $this->curl_post_https($url,$datas);
print_r(json_encode($data));
}
}
```
运行以下代码时:
~~~lisp
imagecreatefrompng('http://imgur.com/NUl4v.png');
~~~
我得到一个错误:
> **PHP警告**:imagecreatefrompng()*\[function.imagecreatefrompng\]*:无法读取/home/test/...中的图像数据
PNG文件似乎很好-我可以用不同的编辑器打开它，并且Unix`file`命令报告它是:
> `PNG image, 640 x 360, 8-bit/color RGB, non-interlaced`
我不知道为什么，但是以下方法可行:
~~~reasonml
imagecreatefromstring(file_get_contents('http://imgur.com/NUl4v.png'));
~~~
