Easily implement file upload function in php_php tips
This article is divided into five parts to analyze and explain PHP upload files. The specific content is as follows
- File upload variables
- Move the temporary files on the server to the specified directory
- php.ini upload related configurations
- error error number
- Single file upload example
1. File upload variables
//$_FILES:文件上传变量 #name 文件的名称 #type 文件的类型 #tmp_name 临时文件名 #size 文件的大小 #error 错误信息 $filename = $_FILES["myFile"]["name"]; $type = $_FILES["myFile"]["type"]; $tmp_name = $_FILES["myFile"]["tmp_name"]; $size = $_FILES["myFile"]["size"]; $error = $_FILES["myFile"]["error"];
2. Move the temporary files on the server to the specified directory
//1.move_uploaded_file($tmp_name,$destination):将服务器上的临时文件移动到指定目录下 #上传后文件名字，移动成功返回true，否则返回false move_uploaded_file($tmp_name,"D:/".$filename); //2.copy($tmp_name,$destination) copy($tmp_name,"D:/".$filename);
3.php.ini upload related configurations
# file_uploads=On 支持HTTP上传 # upload_tmp_dir="" 临时文件保存的目录 # upload_max_filesize=2M 允许上传文件的最大值 # max_file_uploads=20 允许一次上传的最大文件数 # post_max_size=8M post方式发送数据的最大值 # max_execution_time = 1 设置了脚本被解析器终止之前允许的最大执行时间，单位为秒，防止程序写的不好而占尽服务器资源 # max_input_time = 60 脚本解析输入数据允许的最大时间，单位为秒 # max_input_nesting_level = 64 设置输入变量的嵌套深度 # max_input_vars = 1000 接受多少输入的变量 # memory_limit = 128M 最大单线程的独立内存使用量
4.error error number
# 0，没有错误发生，文件上传成功。 # 1，上传的文件超过了 php.ini 中 upload_max_filesize 选项限制的值。 # 2，上传文件的大小超过了 HTML 表单中 MAX_FILE_SIZE 选项指定的值。 # 3，文件只有部分被上传。 # 4，没有文件被上传。 # 6，找不到临时文件夹。 # 7，文件写入失败。 # 8，上传的文件被PHP扩展程序中断
5. Single file upload example
form.html
<!doctype html> <html lang="en"> <head> <meta charset="UTF-8"> <title>Document</title> </head> <body> <form action="fileUpload.php" method="post" enctype="multipart/form-data"> 请选择你要上传的文件: <input type="file" name="myFile"><br> <input type="submit" value="上传文件"> <!--限制客户端上传文件的最大值 隐藏域另起一行--> <!--<input type="hidden" name="MAX_FILE_SIZE" value="字节数">--> <!--accept设置上传文件的类型--> <!--<input type="file" name="myfile" accept="image/jpg,image/png,image/gif">--> </form> </body> </html>
fileUpload.php
header("content-type:text/html;charset:utf-8");
$fileInfo = $_FILES["myFile"];
$filename = $fileInfo["name"];
$type = $fileInfo["type"];
$error = $fileInfo["error"];
$size = $fileInfo["size"];
$tmp_name = $fileInfo["tmp_name"];
$maxSize=2*1024*1024;//允许的最大值
$allowExt=array("jpeg","jpg","gif");
$flag = true;//检测是否为真实的图片类型
//判断错误号
if($error == 0){
//判断上传文件的大小
if($size>$maxSize){
exit("上传文件过大");
}
//检测文件类型
//取出文件扩展名
$ext = pathinfo($filename,PATHINFO_EXTENSION);
if(!in_array($ext,$allowExt)){
exit("非法文件类型");
}
//检测是否为真实的图片类型
if($flag){
if(@!getimagesize($tmp_name)){
exit("不是正的图片类型");
}
}
//创建目录
$path = "D:/test/";
if(!file_exists($path)){
mkdir($path,0777,true);
chmod($path,0777);
}
//确保文件名唯一,防止重名覆盖
$uniName = md5(uniqid(microtime(true),true)).".".$ext;
$destination = $path.$uniName;
if(@move_uploaded_file($tmp_name,$destination)){
echo "上传成功";
}else{
echo "上传失败";
}
}else{
switch($error){
case 1:
case 2:
case 3:
case 4:
case 6:
case 7:
case 8:
echo "上传错误";
break;
}
}
I hope this article will be helpful to everyone learning PHP programming.
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