PHP文件上传-0828

实例

    <!-- post请求，修改数据 -->
<form action="<?php echo $_SERVER['PHP_SELF'] ?>" method="post" enctype="multipart/form-data">
    <fieldset>
       	<legend>文件上传</legend>
       
        <input type="file" name="upload" size="50" />
        <p><button type="submit" name="submit">上传</button></p>
    </fieldset>
</form>




<?php
    //检测用户提交的类型
    if ($_SERVER['REQUEST_METHOD'] == 'POST'){
        //1.isset()检查是否有文件被上传
        if (isset($_FILES['upload'])){
            //设置允许上传的格式
            $allow = ['image/jpg','image/jpeg','image/png'];
            
            //创建上传
           if (in_array($_FILES['upload']['type'],$allow)){
                //将文件上传到临时文件
                if (move_uploaded_file($_FILES['upload']['tmp_name'],"upload/{$_FILES['upload']['name']}")){
                	//上传成功
                    echo "<script>alert('文件上传成功')</script>";
                }
            }else{
            	//格式不对
                echo "<script>alert('仅允许上传jpg和png格式的图片')</script>";
            }
        }
        //设置错误信息
        if ($_FILES['upload']['error'] > 0 ){
            echo '<p>错误原因是:<strong>';
            switch ($_FILES['upload']['error']){
                case 1:
                    echo '文件超过了php.ini配置中设置的大小';
                    break;
                case 2:
                    echo '文件超过了表单中常量设置的大小';
                    break;
                case 3:
                    echo '仅有部分文件被上传';
                    break;
                case 4:
                    echo '没有文件被上传';
                    break;
                case 6:
                    echo '没有可用的临时文件夹';
                    break;
                case 7:
                    echo '磁盘已满,写入失败';
                    break;
                case 8:
                    echo '上传意外中止';
                    break;
                default:
                    echo '系统未知错误';
                    break;
            }
            echo '</strong></p>';
            if (file_exists($_FILES['upload']['tmp_name']) && is_file($_FILES['upload']['tmp_name'])) {
                unlink($_FILES['upload']['tmp_name']);
            }
        }
    }else {
        exit('请求类型错误');
    }


 ?>