php下载远程图片并且生成缩略图

引言

缩略图调用的是thinkphp5.0的组件

composer require topthink/think-image --no-plugins

需要引入文件类：https://blog.dazijie.com/article/104

代码

use app\common\utils\File;

public function downloadImg($fileurl,$thumb_max_width = 150,$thumb_max_height = 150)
{
    $date = date('Ymd');
    $imginfo = getimagesize($fileurl);
    $mime = $imginfo['mime'];
    $exts = [
        'image/jpeg'=>'jpg',
        'image/png'=>'png',
        'image/gif'=>'gif',
        'image/svg+xml'=>'svg'
    ];
    $ext = $exts[$mime];
    // getcwd() 输出=>/www/wwwroot/xxxx.xxxx.com/public
    $str = md5(uniqid(md5(microtime(true)),true));
    $str = md5(sha1($str));
    $sub1 = '/spider/images/'.$date;
    $sub2 = '/'.$str.'.'.$ext;
    $img_path = $sub1.$sub2;
    $img_thumb = $sub1.'/thumb'.$sub2;
    $content = file_get_contents($fileurl);
    if (!$content) {
        return false;
    }
    File::write(getcwd().$img_path,$content);
    File::autoCreateDir(getcwd().$img_thumb);
    $image = \think\Image::open(getcwd().$img_path);
    // 按照原图的比例生成一个最大为150*150的缩略图并保存为thumb.png
    $image->thumb($thumb_max_width, $thumb_max_height)->save(getcwd().$img_thumb);
    return compact('img_path','img_thumb');
}