bfds

<?php
$x=128;
do {
if($x%2==0){
    $tbl[] = 0;
    $x-=$x/2;
    if ($x<1) {
        break;
    }
}
if($x%2==1){
    $tbl[] = 1;
    $x-=$x/2;
    if ($x<1) {
        break;
    }
}

}
while ($x > 0);

for( $x = 0, $cnt = count($tbl); $x < $cnt; $x++ ){
 echo $tbl[$x];
}