video_server/Modules/Api/Controllers/UploadController.php

<?php

namespace Modules\Api\Controllers;

class UploadController extends BaseController
{
    public function image()
    {
        $allwImageExts = ['jpg', 'jpeg', 'png', 'gif', 'webp'];
        $allowImageMimes = [
            'gif' => 'image/gif', 'jpeg' => 'image/jpeg', 'jpg' => 'image/jpg',
            'png' => 'image/png', 'webp' => 'image/webp'
        ];
        $maxUploadSize = 5 *
        $uploadFileName = 'file';
        if (empty($_FILES[$uploadFileName])) {
            return json_fail('请选择文件');
        }
        $file = $_FILES[$uploadFileName];
        $fileName = $file['name'];
        $fileMime = $file['type'];
        $fileSize = $file['size'];  // 单位字节,1024字节=1kb
        $fileExt = $this->getFileExtension($fileName);
        if (!in_array($fileExt, $allwImageExts)) {
            return json_fail('文件无效');
        }
    }

    public function getFileExtension($filename)
    {
        $pathinfo = pathinfo($filename);
        return $pathinfo['extension'];
    }

    private function checkIsUploadFile($file)
    {
        return is_uploaded_file($file);
    }
}