php 从上传的文件创建缩略图的简单示例

人气：724 时间：2018-09-21

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<? 
/**
 * php从上传的文件创建缩略图
 *
 * @param 
 * @author 四海网 www.q1010.com
 **/
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 
} 

/*** 来自四海网（www.q1010.com） ***/
?>

经测试代码如下：


<html><head><title>create thumb www.q1010.com</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>

本文来自：http://www.q1010.com/173/634-0.html

注：关于php 从上传的文件创建缩略图的简单示例的内容就先介绍到这里，更多相关文章的可以留意四海网的其他信息。

关键词：缩略图

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