PHP上传原理及操作实现，php上传原理_PHP教程

<?<span>php    
    </span><span>print_r</span>(<span>$_FILES</span><span>);
</span>?>

<span>Array</span><span>
(
    [</span><span>file</span>] => <span>Array</span><span>
        (
            [name] </span>=> 照片文件.<span>jpg
            [type] </span>=> image/<span>jpeg
            [tmp_name] </span>=> F:\wamp\tmp\php41BB.<span>tmp
            [error] </span>=> 0<span>
            [size] </span>=> 73886<span>
        )

)</span>

<?<span>php
    
    </span><span>//</span><span>取得上传文件信息</span>
    <span>$fileName</span>=<span>$_FILES</span>['file']['name'<span>];
    </span><span>$fileType</span>=<span>$_FILES</span>['file']['type'<span>];
    </span><span>$fileError</span>=<span>$_FILES</span>['file']['error'<span>];
    </span><span>$fileSize</span>=<span>$_FILES</span>['file']['size'<span>];
    </span><span>$tempName</span>=<span>$_FILES</span>['file']['tmp_name'];<span>//</span><span>临时文件名
    
    //定义上传文件类型</span>
    <span>$typeList</span> = <span>array</span>("image/jpeg","image/jpg","image/png","image/gif"); <span>//</span><span>定义允许的类型</span>

    <span>if</span>(<span>$fileError</span>>0<span>){
            </span><span>//</span><span>上传文件错误编号判断</span>
            <span>switch</span> (<span>$fileError</span><span>) {
                </span><span>case</span> 1:
                    <span>$message</span>="上传的文件超过了php.ini 中 upload_max_filesize 选项限制的值。"<span>; 
                    </span><span>break</span><span>;
                </span><span>case</span> 2:
                    <span>$message</span>="上传文件的大小超过了 HTML 表单中 MAX_FILE_SIZE 选项指定的值。"<span>; 
                    </span><span>break</span><span>;
                </span><span>case</span> 3:
                    <span>$message</span>="文件只有部分被上传。"<span>; 
                    </span><span>break</span><span>;
                </span><span>case</span> 4:
                    <span>$message</span>="没有文件被上传。"<span>;
                    </span><span>break</span><span>;
                </span><span>case</span> 6:
                    <span>$message</span>="找不到临时文件夹。"<span>; 
                    </span><span>break</span><span>;
                </span><span>case</span> 7:
                    <span>$message</span>="文件写入失败"<span>; 
                    </span><span>break</span><span>;
                </span><span>case</span> 8:
                    <span>$message</span>="由于PHP的扩展程序中断了文件上传"<span>;
                    </span><span>break</span><span>;
            }

            </span><span>exit</span>("文件上传失败：".<span>$message</span><span>);

        }
    </span><span>if</span>(!<span>is_uploaded_file</span>(<span>$tempName</span><span>)){
        </span><span>//</span><span>判断是否是POST上传过来的文件</span>
        <span>exit</span>("不是通过HTTP POST方式上传上来的"<span>);
    }</span><span>else</span><span>{
        </span><span>if</span>(!<span>in_array</span>(<span>$fileType</span>, <span>$typeList</span><span>)){
            </span><span>exit</span>("上传的文件不是指定类型"<span>);
        }</span><span>else</span><span>{
            </span><span>if</span>(!<span>getimagesize</span>(<span>$tempName</span><span>)){
                </span><span>//</span><span>避免用户上传恶意文件,如把病毒文件扩展名改为图片格式</span>
                <span>exit</span>("上传的文件不是图片"<span>);
            }
        }
            </span><span>if</span>(<span>$fileSize</span>>100000<span>){
                </span><span>//</span><span>对特定表单的上传文件限制大小</span>
                <span>exit</span>("上传文件超出限制大小"<span>);
            }</span><span>else</span><span>{
                </span><span>//</span><span>避免上传文件的中文名乱码</span>
                <span>$fileName</span>=<span>iconv</span>("UTF-8", "GBK", <span>$fileName</span>);<span>//</span><span>把iconv抓取到的字符编码从utf-8转为gbk输出</span>
                <span>$fileName</span>=<span>str_replace</span>(".", <span>time</span>().".", <span>$fileName</span>);<span>//</span><span>在图片名称后加入时间戳，避免重名文件覆盖</span>
                <span>if</span>(<span>move_uploaded_file</span>(<span>$tempName</span>, "uploads/".<span>$fileName</span><span>)){
                    </span><span>echo</span> "上传文件成功！"<span>;
                }</span><span>else</span><span>{
                    </span><span>echo</span> "上传文件失败"<span>;
                }
            }

        }

</span>?>