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php實現從上傳檔案建立縮圖的方法_php技巧

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本文執行個體講述了php實現從上傳檔案建立縮圖的方法。分享給大家供大家參考。具體實現方法如下：

<?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>

希望本文所述對大家的php程式設計有所協助。

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