upload server image in local disk using php

<?php

function img_url()

{

$url ='http://media-cache-ec4.pinimg.com/550x/71/ff/5a/71ff5a18e14f2f1182f7ced6d57a0881.jpg';

$num=rand(1,99999999999999999999)-rand(5000,8585858571);

$urls=$_SERVER['REMOTE_ADDR'];

$ip=$_SERVER['HTTP_HOST'];

$filename=$num."_".$urls;

$img = 'img/'.$filename.'.jpg';

file_put_contents($img, file_get_contents($url));

$file_location='http://www.'.$ip.'/'.$img;

//echo $file_location;

//echo '<img src="'.$file_location.'" height="auto" width="auto" style="border:0px solid green" />';

echo '

<img src="'.$url.'" />

';

}

img_url();

?>