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<?php
$h = fopen("ip.txt","r"); 
while (!feof ($h)) {
    $content = fgets($h);
 var_dump($s);
    if($s === $_SERVER['REMOTE_ADDR'])
 { echo "Вы имеете доступ<br>"; }
 else
 { echo "Вы не имеете доступ"; }
}
fclose($h);
?>

<?php 
$ip = file('Z:\home\test1.ru\www\ip.txt');
$s = 0;
while( $s < 30 )
{ 
if( $ip[$s] === $_SERVER['REMOTE_ADDR'])
{
echo "ok";
}
else
{
echo "Ne ok!</br>";
$s++;
}
}
?>

<?php 
$ip = file('Z:\home\test1.ru\www\ip.txt');
$a = 0;
while( $a < 50 )
{
$a++;
if( $ip[$a] === $_SERVER['REMOTE_ADDR'])
{ echo "Тут код";}
}


?>