<form method="post" action="suo_do.php" enctype="multipart/form-data">
<input type="file" name="pic" />
<input type="submit" value=" upload 1" />
</form>
<?php
header("content-type:text/html;charset=gbk");
ini_set("date.timezone","Asia/chong");
// Determine if the file is empty
if(empty($_FILES)){
echo" Uploading files too large ";
exit;
}
// Determine if there is an error in the file upload
if($_FILES['pic']['error']){
echo " Upload a file ";
exit;
}
// Determines 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 upload of files ";
exit;
}
$file=date('YmdHis').rand().".".$ex;
$src=$_FILES['pic']['tmp_name'];
$des="upload/".$file;
$rs=move_uploaded_file($src,$des);
// The thumbnail
// Read the uploaded image
$image=imagecreatefromjpeg($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.ofstack.com
// Create a blank new image
$newimage=imagecreatetruecolor($width, $height);
//copy Source image content copy New pictures
imagecopyresized($newimage, $image, 0,0, 0,0, $width, $height, $w, $h);
$filename="upload/s_".$file;
imagejpeg($newimage,$filename);