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PHP文件之上传

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Jun 23, 2016 pm 01:29 PM

一、$_FILES数组

$_FILES[“file”][“name”]：上传文件的原始名称。

$_FILES[“file”][“type”]：上传的文件类型。

$_FILES[“file”][“size”]：上传文件的原始大小。

$_FILES[“file”][“tmp_name”]：上传文件后的暂存位置。

$_FILES[“file”][“error”]：如果上传文件有错误，则显示错误代码

UPLOAD_ERR_OK 值：0; 没有错误发生，文件上传成功。

UPLOAD_ERR_INI_SIZE 值：1; 上传的文件超过了 php.ini 中 upload_max_filesize 选项限制的值。

UPLOAD_ERR_FORM_SIZE 值：2; 上传文件的大小超过了 HTML 表单中 MAX_FILE_SIZE 选项指定的值。（我们可以在form表单中指定input type=’hidden’ name=’MAX_FILE_SIZE’ value=’附件的最大字节数’）

UPLOAD_ERR_PARTIAL 值：3; 文件只有部分被上传。

UPLOAD_ERR_NO_FILE 值：4; 没有文件被上传。

二、常见的文件类型

xls：application/vnd.ms-excel

xlsx：application/vnd.openxmlformats-officedocument.spreadsheetml.sheet

ppt：application/vnd.ms-powerpoint

pptx：application/vnd.openxmlformats-officedocument.presentationml.presentation

doc：application/msword

docx：application/vnd.openxmlformats-officedocument.wordprocessingml.document

zip：application/x-zip-compressed

rar：application/x-zip-compressed

wmv：video/x-ms-wmv

mp3：audio/mpeg

mp4：video/mp4

gif：image/git

jpeg：image/jpeg或image/pjpeg
备注：对于 IE，识别 jpg 文件的类型必须是 pjpeg，对于 FireFox，必须是 jpeg。

三、文件上传过程

文件被上传结束后，默认地被存储在了临时目录中，这时必须将它从临时目录中删除或移动到其它地方，如果没有，则会被删除。也就是不管是否上传成功，脚本执行完后临时目录里的文件肯定会被删除。所以在删除之前要用PHP的 copy()或者move_upload_file() 函数将它复制或者移动到其它位置，此时，才算完成了上传文件过程。

用form上传文件时，一定要加上属性内容 enctype=”multipart/form-data”，否则用$_FILES[filename]获取文件信息时会报异常。

四、保存上传的文件（move_uploaded_file）

bool move_uploaded_file ( string $filename , string $destination )

参数：

filename：上传的文件的文件名。

destination：移动文件到这个位置

返回值：

成功时返回 TRUE。

如果 filename 不是合法的上传文件，不会出现任何操作，move_uploaded_file() 将返回 FALSE。

如果 filename 是合法的上传文件，但出于某些原因无法移动，不会出现任何操作，move_uploaded_file() 将返回 FALSE。此外还会发出一条警告。

五、一个简单的上传文件的例子

注：

中的enctype属性的可选值为↓↓↓↓ 值描述

application/x-www-form-urlencoded	在发送前编码所有字符（默认）
multipart/form-data	不对字符编码。在使用包含文件上传控件的表单时，必须使用该值。
text/plain	空格转换为 “+” 加号，但不对特殊字符编码。

1、上传文件的表单1.html

<html><head><title>上传文件</title></head><body><form action='1.php' method='post' enctype='multipart/form-data'>选择文件：<input type='file' name='imgfile' /><br /><input type='submit' name='submit' value='提交' /></form></body></html>

2、处理文件的脚本1.php

<?php if($_FILES['imgfile']['error']==0){ #限制上传的文件类型和大小 if((($_FILES['imgfile']['type']=="image/gif")|| ($_FILES['imgfile']['type']=="image/jpeg")|| ($_FILES['imgfile']['type']=="image/pjpeg"))&& ($_FILES['imgfile']['size'])>=30720){ #注意：此时文件夹upload必须已经存在，否则会报错！ if(file_exists("upload/".$_FILES['imgfile']['name'])) echo "文件已存在，请不要重复上传。"; else move_uploaded_file($_FILES['imgfile']['tmp_name'],"upload/".$_FILES['imgfile']['name']); echo "文件上传成功！"; }else{ echo "不是jpeg或gif的图片格式，或者文件小于30k!请重新上传。"; } } ?>

六、致谢

PHP文件上传；

PHP：move_uploaded_file-Manual;

php中$_FILES变量的用法;

PHP上??案，透? PHP $_FILES ?列??上??案;

php上传常见文件类型和$_FILES[“file”][“type”].

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