通过File文件函数来操作上传的图片,下面是转自zend.com上的一篇文章,有许多可取之处,但是却感觉到众多的目录很古怪,大家看了后可以相互讨论一下: // FILE 1: DISPLAY AND PROCESS ENTRY FORM AND UPLOAD PICTURE FILE TO SERVER // full directory path $filepath = "/home/httpd/html/tut/upload"; // 200K is the maximum (picture) file size to be accepted define("MAX_FILE_SIZE", 200*1024); function print_error ($err) { echo " $err"; } do { // check if picture name variable has a value; if not, skip to the // "while(false)" section of "do" statement if(isset($picture)) { // here is where the server transparently checks that the client picture file // doesn't exceed maximum allowable size if(getenv("CONTENT_LENGTH") > MAX_FILE_SIZE) { print_error("File too large: $picture_name"); break; } // open client picture file for read only; "@" prefix tells fopen not to print // message if there is an error, since function print_error does that // if there is an error, break out of "do" loop and continue at "while(false)" $fp = @fopen($picture,"r"); if(!$fp) { print_error("Cannot open file: $picture_name"); break; } // generate unique name for session, use it to generate unique server // directory name, and create the directory srand((double) microtime() * 1000000); $id = md5(uniqid(rand())); $dirname = "$filepath/$id"; mkdir($dirname,0700); // create the server picture file in the newly created server directory $filename = $dirname . "/picture"; // open server picture file for write only; "@" prefix tells fopen not to // print message if there is an error, since function print_error does that // if there is an error, break out of "do" loop and continue at "while(false)" $out = @fopen($filename,"w"); if(!$out) { print_error("Cannot open file: $filename"); break; } // copy client picture file to server picture file while($buffer = fread($fp,8192)) { fwrite($out,$buffer); } // close client picture file and server picture file fclose($fp); fclose($out); // create server name file in picture file directory; this file will hold the // name of the picture file $filename = $dirname . "/name"; // open server name file for write only; "@" prefix tells fopen not to print // message if there is an error, since function print_error does that // if there is an error, break out of "do" loop and continue at "while(false)" $out = @fopen($filename,"w"); if(!$out) { print_error("Cannot open file: $filename"); break; } // write the server picture name to the server name file, and close the server // name file fputs($out,$name); fclose($out); // display message that client picture file was successfully copied to the // server, display a prompt to look at updated server photo gallery, and supply // the HTML link ?> Picture added. Thanks. Continue to the gallery // exit to the server photo gallery exit(); } } while(false); // you get to here only when "if(isset($picture))" is false, which means that // no picture name has been submitted, therefore go display the input form where // the necessary information can be entered ?> Photo gallery add// start of segment of code for displaying input form // using $PHP_SELF for value of "form action" causes form to refer to itself // when "submit" button is clicked ?> // ------------------------------------------------------ // FILE 2: DISPLAY THE SERVER PHOTO GALLERY Photo gallery// full directory path $filepath = "/home/httpd/html/tut/upload"; // user's path in browser -- same as full directory path $url_path = "/tut/upload"; // get unique server directory used for this user session $dir = dir($filepath); // loop through all server subdirectories for this user session while($entry=$dir->read()) { // if entry is system file (doesn't have picture files), go to next entry in // "while" loop if($entry == "." || $entry == "..") { continue; } // open server name file for read only; "@" prefix tells fopen not to print // message if there is an error, since function print_error does that // if there is an error, go to next entry in "while" loop $fp = @fopen("$filepath/$entry/name","r"); if(!$fp) { print "Bad entry: $entry "; continue; } // get name of the server picture file and close the server name file $name = fgets($fp,4096); fclose($fp); // display each picture and its file name; in addition, "alt=" causes the file // name to be displayed as ToolTip text when mouse points to picture ?> " alt=" echo $name ?>"> echo $name ?> } ?> |
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