Advanced usage of while(){}_PHP tutorial

/*$ip="127.0.0.1";
if($_SERVER["REMOTE_ADDR"]==$ip){
   header("location:xxx.php");
}else{

      header("location:yyy.php");
}


function limitIp($ip){
if($_SERVER[REMOTE_ADDR]==$ip){
   header("location:XXx.php");
}else{
   header("location:YYY.php");
}
}*/

/*
echo "

";
echo "";
$i=0;
$j=0;
while($i<1000){
if($i%10==0){
   if($j++%2==0){
    $bgc="#cccccc";
   }else{
      $bgc="aaffaa";
   }
   //echo "";
   echo "";
}
echo "";
if(++$i%10==0){
   echo "";
}

}
echo "

$i

";
*/
echo "";
echo "";
$i=0;
$k=0;
while($i<100){
    if($i%2==0){
    $bgc="#cccccc";
}else{
     $bgc="#aaffaa";
}
echo "";

$j=0;
while($j<10){
  
   echo "";
   $j++;
   $k++;
}
echo "";
$i++;

}
echo "

$k

";
?>
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