php实现从上传文件创建缩略图的方法

本文实例讲述了php实现从上传文件创建缩略图方法。分享给大家供大家参考。具体实现方法如下:

  <?php  if ($_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。

php实现从上传文件创建缩略图的方法

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