how can i get the size of an image that not on my server using this command imagesx ?

how can i get the size of an image that not on my server using this command imagesx  ?
mgtm3Asked:
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Roger BaklundCommented:
Why do you have to use imagesx? That would require that you first load the image into php, using for instance imagecreatefromjpeg(), if it is a jpeg. It's easier to use getimagesize():

http://php.net/manual/en/function.getimagesize.php
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marchentCommented:
Use the example code from the provided link.
http://icfun.blogspot.com/2008/11/php-get-remote-file-size.html
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