Uploading of PHP files

<?phpheader (' Content-type:text/html;charset=utf-8 '), if (Isset ($_post[' submit ')) {//Test form ' submit ' whether there is an upload, If there is an upload to continue the next step, if not then it will not respond if (Is_uploaded_file ($_files[' myfile ' [' tmp_name '])) {//detect if the specified file is uploaded via Http post, if it is to continue to the next step, If not the hint ' there may be an attack! ' $arr =pathinfo ($_files[' myfile ' [' name ']);//output returns the information of the path (what to look for in the manual) $newName =date (' Ymdgis '). Rand (1000,9999); Add 1000 to 9999 random numeric output file name if (Move_uploaded_file ($_files[' myfile '] [' tmp_name '], "upload/{$newName}.{by date $arr [' extension ']}) {//move_uploaded_file moves the file to another file (the function parameter is the path to the file that was written and moved to the destination)//($arr [' extension '] This function determines the file suffix name based on the information of the return path//If the uploaded file is moved to the target directory successfully then the output ' upload is successful! ', otherwise output ' move file failed! '//Why write the file name and suffix at the same time? Because the same file name and suffix are overwritten, so write this judgment.         echo  ' upload success! ';    }else{    echo  ' failed to upload file! ';     }    }else{    exit (' There might be an attack! ');     }}var_dump ($_files);? ><! doctype html>
Step 1: Detect the form ' submit ' whether there is an upload, if there is upload to continue the next step, if not then no response.
Step 2: Detect if the specified file is uploaded via HTTP post, if it is the next step, if it is not prompt ' There may be an attack! ‘。
Step 3:move_uploaded_file Move the file to another file (the function parameter is to write the file to be moved and move to the path to the destination file).
Step 4: To upload files at the same time write the file name and suffix name, because if not write, encountered the same file name and suffix will be overwritten, so write a judgment.
Step 5: For the judge, write a formula that determines the name of the file and the suffix. (See the above procedure for details)
Step 6: Upload the file and test the program.

Before uploading, we need to set the PHP configuration option (php.ini) associated with the upload.
Configuration item Possible value function description
File_uploads on determines whether the PHP script on the server can accept HTTP file uploads.
The Memory_limit 8M Setup script can allocate the maximum amount of memory to prevent runaway scripts from monopolizing the server.
Upload_max_filesize 2M restricts php from processing the maximum value of the uploaded file, which must be less than the post_max_size value.
Post_max_size 8M limits the maximum amount of information that can be accepted through the post method.
Upload_tmp_dir NULL The temporary path where the file is stored, which can be an absolute path. This directory must be writable for the user who owns this server process.

Two. $_files multidimensional arrays: used to store various upload-related information (information displayed after the output) (see the Reference manual)
Three. php File upload processing function: For uploading files for subsequent processing.
Is_uploaded_file () Determines whether the specified file was uploaded via HTTP post
When the Move_uploaded_file () file is uploaded, it is first stored in a temporary directory on the server and can be used to move the uploaded file to a new location.

This article is from the "Technology Heaven" blog, so be sure to keep this source http://jonhson.blog.51cto.com/10559861/1686938
Uploading of PHP files