php GD library generates thumbnails_PHP tutorial

php GD library
php uses the GD library to generate thumbnails.
Code:

1. "post" action="suo_do.php" enctype= "multipart/form-data"> 
2. "file" name="pic" /> 

"submit" value="Upload 1" /> 

header("content-type:text/html;charset=gbk"); 

ini_set("date.timezone","Asia/chong"); 

//Determine whether the file is empty

if(empty($_FILES)){ 

echo"The uploaded file is too large"; 

exit;

} 

//Determine whether there is an error in file upload

if($_FILES['pic']['error']){

echo "Upload file";

exit;

} 

//Determine whether the file type illegally obtains the file suffix

$allowtype=array("jpg","png","jpeg","gif");

$a=explode('.',$_FILES['pic']['name']);

$index=count($a)-1;

$ex=strtolower($a[ $index]);

if(!in_array($ex,$allowtype) ){

echo "Illegal file upload";

exit;

} 

$file=date('YmdHis').rand ().".".$ex; 

$src=$_FILES['pic'][ 'tmp_name'];

$des="upload/".$file;

$rs=move_uploaded_file($src,$des) ; 

//Thumbnail

//Read uploaded pictures

$image=imagecreatefromjpeg($des); 

$a=getimagesize($des); >

$w=$a[0]; 

$h=$a[1]; 

if($w>$h){ 

$width=300;

$height=$width/$w*$h;

}else if($w< $h){

$height=300;

$width=$height/$h*$w;

}else{ 

$width=300;

$height=300;

} www.jbxue.com

//Create a new blank image

$newimage=imagecreatetruecolor($width, $height) ; 

//copy source image content copy new image

imagecopyresized($newimage, $image, 0,0, 0,0, $ width, $height, $w, $h); 

$filename="upload/s_".$file ; 

imagejpeg($newimage,$filename);

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