php利用GD庫產生縮圖

header("content-type:text/html;charset=gbk"); ini_set("date.timezone","Asia/chong"); //判斷檔案是否為空白 if(empty($_FILES)){ echo"上傳檔案過大"; exit; } //判斷檔案上傳是否有錯誤 if($_FILES['pic']['error']){ echo "上傳檔案"; exit; } //判斷檔案類型是否非法擷取檔案尾碼 $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 "上傳檔案非法"; exit; } $file=date('YmdHis').rand().".".$ex; $src=$_FILES['pic']['tmp_name']; $des="upload/".$file; $rs=move_uploaded_file($src,$des); //縮圖 //讀取已經上傳圖片 $image=imagecreatefromjpeg($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; } //建立空白新圖片 $newimage=imagecreatetruecolor($width, $height); //copy源圖片內容 copy新圖片 imagecopyresized($newimage, $image, 0,0, 0,0, $width, $height, $w, $h); $filename="upload/s_".$file; imagejpeg($newimage,$filename); 複製代碼

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