Php uploads images to the server

Php will be used to upload images to php files on the server $ _ FILES system functions

1. $ _ FILES system functions

Common $ _ FILES system functions in PHP programming are used as follows:
$ _ FILES ['myfile'] ['name'] displays the original name of the client file.
$ _ FILES ['myfile'] ['type'] MIME type of the file, for example, "image/gif ".
$ _ FILES ['myfile'] ['size'] size of the uploaded file, in bytes.
$ _ FILES ['myfile'] ['tmp _ name'] indicates the temporary file name, which is generally the default file name.

II. common functions

Common $ _ FILES system functions in PHP programming are used as follows:

$ _ FILES ['myfile'] ['name'] displays the original name of the client file.

$ _ FILES ['myfile'] ['type'] MIME type of the file, for example, "image/gif ".

$ _ FILES ['myfile'] ['size'] size of the uploaded file, in bytes.

$ _ FILES ['myfile'] ['tmp _ name'] indicates the temporary file name, which is generally the default file name.

$ _ FILES ['myfile'] ['error'] error code related to file upload. The meanings of different codes are as follows:

0. the file is uploaded successfully.

1; exceeds the file size set by the system in php. ini.

2. the file size exceeds the value specified by the MAX_FILE_SIZE option.

3. only part of the file is uploaded.

4. no files are uploaded.

5. the size of the uploaded file is 0.

III. php file Upload

To upload a file using form, you must first mark
The php code is as follows:

 $ Cover_pic, 'Store _ name' => $ store_name, 'Tel _ number' => $ tel_number, 'ad _ word' => $ ad_words, 'Store _ introduce '=> $ store_introduce, 'qq _ number' => $ qq_number); updatetable (tname ('open _ member_weixin_ap'), $ setarr, array ('apid' =>$ _ COOKIE ['apid'], 'id' =>> _ COOKIE ['id']); $ smarty-> assign ('loginuser', $ _ COOKIE ['loginuser']); $ smarty-> display ('setting. dwt '); exit ();} gourl ('binding. php '); function upload_store_pic (){ // File storage path $ save_path = './uploads/store_pic/'; if (! File_exists ($ save_path) {mkdir ($ save_path);} // defines the file extension $ ext_arr = array ('image' => array ('GIF ', 'jpg ', 'jpeg', 'PNG ', 'bmp'); // maximum file size $ max_size = 1000000; // if (! Empty ($ _ FILES ['IMG _ file'] ['error']) {switch ($ _ FILES ['IMG _ file'] ['error']) {case '1': $ error = 'exceeds php. ini size. '; Break; case '2': $ error =' exceeds the size allowed by the form. '; Break; case '3': $ error =' only part of the image is uploaded. '; Break; case '4': $ error =' select an image. '; Break; case '6': $ error =' The temporary directory cannot be found. '; Break; case '7': $ error =' an error occurred while writing a file to the hard disk. '; Break; default: $ error =' unknown error. ';} Showmessage ($ error); return '';} // if (empty ($ _ FILES) = false) when a file is uploaded) {// original file name $ file_name = $ _ FILES ['IMG _ file'] ['name']; // temporary file name on the server $ tmp_name =$ _ FILES ['IMG _ file'] ['tmp _ name']; // file size $ file_size = $ _ FILES ['IMG _ file'] ['size']; // check the file name if (! $ File_name) {showmessage ("Select a file. "); Return'';} // Check the directory if (@ is_dir ($ save_path) ===false) {showmessage ("the upload directory does not exist. "); Return'';} // Check the directory write permission if (@ is_writable ($ save_path) ===false) {showmessage ("the upload Directory has no write permission. "); Return'';} // check whether the image has been uploaded. if (@ is_uploaded_file ($ tmp_name) === false) {showmessage ("Upload failed. "); Return'';} // check the file size if ($ file_size> $ max_size) {showmessage ("The size of the uploaded file exceeds the limit. "); Return'';} // Check the directory name $ dir_name = empty ($ _ GET ['dir'])? 'Image': trim ($ _ GET ['dir']); if (empty ($ ext_arr [$ dir_name]) {showmessage ("The directory name is incorrect. "); Return'';} // get the file extension $ temp_arr = explode (". ", $ file_name); $ file_ext = array_pop ($ temp_arr); $ file_ext = trim ($ file_ext); $ file_ext = strtolower ($ file_ext ); // Check the extension if (in_array ($ file_ext, $ ext_arr [$ dir_name]) ===false) {showmessage ("the Upload file extension is not allowed. "); Return'';} // new file name $ new_file_name = date ("YmdHis "). '_'. rand (10000,999 99 ). '_ apid _'. $ _ COOKIE ['apid']. '. '. $ file_ext; // move the file $ file_path = $ save_path. $ new_file_name; if (move_uploaded_file ($ tmp_name, $ file_path) ===false) {showmessage ("An error occurred while uploading the file. "); Return'';} @ chmod ($ file_path, 0777); return $ file_path;} else {return '';}}