laravel-learn-bbs/app/Tools/ImageUploadTool.php

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<?php
/**
* Created by PhpStorm.
* User: xing
* Date: 2017/12/31
* Time: 1:47
*/
namespace App\Tools;
use Illuminate\Http\File;
use Intervention\Image\Facades\Image;
class ImageUploadTool
{
// 只允许以下后缀名的图片文件上传
protected $allowed_ext = ["png", "jpg", "gif", 'jpeg'];
/**
* @param $file File
* @param $folder
* @param $file_prefix
* @param bool $max_width
* @return array|bool
*/
public function save($file, $folder, $file_prefix, $max_width = false)
{
// 构建存储的文件夹规则值如uploads/images/avatars/201709/21/
// 文件夹切割能让查找效率更高。
$folder_name = "uploads/images/$folder/" . date("Ym", time()) . '/' . date("d", time()) . '/';
// 文件具体存储的物理路径,`public_path()` 获取的是 `public` 文件夹的物理路径。
// 值如:/home/vagrant/Code/larabbs/public/uploads/images/avatars/201709/21/
$upload_path = public_path() . '/' . $folder_name;
// 获取文件的后缀名,因图片从剪贴板里黏贴时后缀名为空,所以此处确保后缀一直存在
$extension = strtolower($file->getClientOriginalExtension()) ?: 'png';
// 拼接文件名,加前缀是为了增加辨析度,前缀可以是相关数据模型的 ID
// 值如1_1493521050_7BVc9v9ujP.png
$filename = $file_prefix . '_' . time() . '_' . str_random(10) . '.' . $extension;
// 如果上传的不是图片将终止操作
if (!in_array($extension, $this->allowed_ext)) {
return false;
}
// 将图片移动到我们的目标存储路径中
$file->move($upload_path, $filename);
// 如果限制了图片宽度,就进行裁剪
if ($max_width && $extension != 'gif') {
// 此类中封装的函数,用于裁剪图片
$this->reduceSize($upload_path . '/' . $filename, $max_width);
}
return [
'path' => config('app.url') . "/$folder_name/$filename"
];
}
public function reduceSize($file_path, $max_width)
{
// 先实例化,传参是文件的磁盘物理路径
$image = Image::make($file_path);
// 进行大小调整的操作
$image->resize($max_width, null, function ($constraint) {
// 设定宽度是 $max_width高度等比例双方缩放
$constraint->aspectRatio();
// 防止裁图时图片尺寸变大
$constraint->upsize();
});
// 对图片修改后进行保存
$image->save();
}
}