PHP 99 bottles golf

Minified

<?php $b=99;$d=" bottles of beer";$c=$d." on the wall";$f="file";do{echo $b.$c.", ".$b.$d.".\n";if(--$b==0){echo $f('http://is.gd/sKW90b')[0];$b=99;}else echo $f('http://is.gd/2m5PYo')[0];echo ", ".$b.$c.".\n\n";}while($b<99);

Readable

<?php
$b=99;
$d=" bottles of beer";
$c=$d." on the wall";
$f="file";
do{
    echo $b.$c.", ".$b.$d.".\n";
    if(--$b==0){
        echo $f('http://is.gd/sKW90b')[0];$b=99;
    }else
        echo $f('http://is.gd/2m5PYo')[0];
    echo ", ".$b.$c.".\n\n";
}while($b<99);