PHP 获取图片宽度等属性

getimagesize 

                  $image_file   =   "64.jpg "; 
$image_size   =   getimagesize($image_file); 
print( "图片的宽度: ".   $image_size[0]. " <br> "); 
print( "图片的高度: ".   $image_size[1]. " <br> "); 
print( "文件的格式为: ".   $image_size[2]. " <br> ");