本文实例讲述了php实现从上传文件创建缩略图的方法。分享给大家供大家参考。具体实现方法如下：
<?phpif ($_REQUEST["action"]=="add"){$userfile = $HTTP_POST_FILES["photo"]["tmp_name"];$userfile_name = $HTTP_POST_FILES["photo"]["name"];$userfile_size = $HTTP_POST_FILES["photo"]["size"];$userfile_type = $HTTP_POST_FILES["photo"]["type"];///////////////////////// //GET-DECLARE DIMENSIONS //$dimension = getimagesize($userfile);$large_width = $dimension[0]; // GET PHOTO WIDTH$large_height = $dimension[1]; //GET PHOTO HEIGHT$small_width = 120; // DECLARE THUMB WIDTH$small_height = 90; // DECLARE THUMB HEIGHT///////////////////////////CHECK SIZE //if ($userfile_size>102400){ $error=1; $msg = "The photo is over 100kb. Please try again.";}////////////////////////////////// CHECK TYPE (IE AND OTHERS) //if ($userfile_type="image/pjpeg"){ if ($userfile_type!="image/jpeg"){ $error=1; $msg = "The photo must be JPG"; }}////////////////////////////////CHECK WIDTH/HEIGHT //if ($large_width!=600 or$large_height!=400){$error=1;$msg = "The photo must be 600x400 pixels";}/////////////////////////////////////////////CREATE THUMB / UPLOAD THUMB AND PHOTO ///if ($error<>1){ $image = $userfile_name; //if you want to insert it to the database $pic = imagecreatefromjpeg($userfile); $small = imagecreatetruecolor($small_width,$small_height); imagecopyresampled($small,$pic,0,0,0,0, $small_width, $small_height, $large_width, $large_height); if (imagejpeg($small,"path/to/folder/to/upload/thumb".$userfile_name, 100)){ $large = imagecreatetruecolor($large_width,$large_height); imagecopyresampled($large,$pic,0,0,0,0, $large_width, $large_height, $large_width, $large_height); if (imagejpeg($large,"path/to/folder/to/upload/photo".$userfile_name, 100)) {} else {$msg="A problem has occured. Please try again."; $error=1;} } else { $msg="A problem has occured. Please try again."; $error=1; }}///////////////////////////////////////////////// If everything went right a photo (600x400) and/// a thumb(120x90) were uploaded to the given folders}?><html><head><title>create thumb</title></head><body><form name="form1" enctype="multipart/form-data" action="thisfile.php?action=add" method="post">Select Photo: <input type="file" name="photo"><input type="submit" name="submit" value="CREATE THUMB AND UPLOAD"></form></body</html>希望本文所述对大家的php程序设计有所帮助。
