felayman——PHP中图片上传到服务器

1.upload_file.php

<?php

//该文件负责获取上传的图片的扩展名和随机生成文件名

header("content-type:text/html;charset=utf-8");

/**

* 获取文件扩展名

*Enter description here ...

* @param unknown_type $filename

*/

function getFileName($filename){

//strrchr— 查找指定字符在字符串中的最后一次出现

return substr(strrchr($filename,'.'), 1);

}

/**

* 随机生成n位字符串

* Enterdescription here ...

* @param unknown_type $num

*/

function rand_str($num){

$str = "qwertyuioplkjhgfdsazxcvbnmQAZWSXEDCRFVTGBYHNUJMIKOLP1234567890";

$str_len = strlen($str)-1;

//echo$str_len;

$s='';

for ($i = 0; $i < $num; $i++) {

$s.=$str[rand(0,$str_len)];

}

echo $s;

}

?>

2.index.html

<formaction="upload_file.php"method="post">

<inputtype="file" name="file1"/>

<inputtype="submit" value="上传"/>

</form>

3.deal_upload.php

<?php

header("content-type:text/html;charset=utf-8");

//引入获取上传文件的名称已经生成文件名的函数lib

require 'upload_file.php';

//设置文件要保存的目录

$upload_dir = "files/";

if(!file_exists($upload_dir)){

mkdir($upload_dir);

}

//设置运行上传的文件类型

$type =array('jpg','png','gif','jpeg');

//in_array — 检查数组中是否存在某个值

if(!in_array(strtolower(getFileName($_FILES['file']['name'])), $type)){

//implode,将数组联合成一个字符串

$text = implode(',', $type);

echo "<script>alert('文件类型只允许是{$text}');window.location='index.html';</script>";

}else{

//获取文件名称

$filename = explode('.', $_FILES['file']['name']);

$filename[0] =rand_str(10);

$name =implode('.', $filename);

$uploadfile=$upload_dir.$name;

//is_uploaded_file — 判断文件是否是通过 HTTP POST上传的

if(is_uploaded_file($_FILES['file']['tmp_name'])){

//move_uploaded_file— 将上传的文件移动到新位置

if(move_uploaded_file($_FILES['file']['tmp_name'],$uploadfile)){

$file_path = getcwd().'\\'.$uploadfile;echo "<center> 您的文件上传完毕,上传图片预览:</center>";

echo "<img src='$uploadfile'/><br/>";

echo "<a href='javascript:history.go(-1)'>继续上传</a>";

}else{

echo "上传失败";

}

}

}

?>