laravel如何实现图片上传、裁剪和生成缩略图_Laravel图片上传裁剪与缩略图生成教程

<form action="/upload" method="POST" enctype="multipart/form-data">
  @csrf
  <input type="file" name="image" accept="image/*">
  <button type="submit">上传并处理</button>
</form>

use Illuminate\Http\Request;
use Intervention\Image\Facades\Image;

public function upload(Request $request)
{
    $request->validate([
        'image' => 'required|image|mimes:jpeg,png,jpg,gif|max:2048',
    ]);

    if ($request->hasFile('image')) {
        $image = $request->file('image');
        $filename = time() . '_' . uniqid() . '.' . $image->getClientOriginalExtension();
        $path = public_path('uploads/original/');

        // 移动原始文件
        $image->move($path, $filename);

        // 生成缩略图和裁剪
        $this->generateThumbnails($filename);

        return back()->with('success', '图片上传并处理成功！');
    }

    return back()->with('error', '上传失败');
}

private function generateThumbnails($filename)
{
    $path = public_path('uploads/original/' . $filename);
    $thumbPath = public_path('uploads/thumb/');
    $cropPath = public_path('uploads/cropped/');

    // 确保目录存在
    if (!is_dir($thumbPath)) mkdir($thumbPath, 0755, true);
    if (!is_dir($cropPath)) mkdir($cropPath, 0755, true);

    $img = Image::make($path);

    // 生成缩略图（等比缩放至宽度200）
    $img->resize(200, null, function ($constraint) {
        $constraint->aspectRatio();
    });
    $img->save($thumbPath . 'thumb_' . $filename);

    // 裁剪为正方形（居中裁剪 300x300）
    $img->fit(300, 300);
    $img->save($cropPath . 'crop_' . $filename);
}

$path = $request->file('image')->store('original', 'public');