How to find multiple points within a polygon - php

Question

I am using the following code to test if a point is in a polygon, however I would like to make it work for multipliable points, but when I run it though a loop it fails to run correctly.
Polygon array = (52.62806176021313, 1.0546875),(52.435920583590125, 0.82672119140625),(52.26479561297205, 0.78277587890625),(52.24966453484505, 1.0986328125),(52.37224556866933, 1.34857177734375),(52.63973017532399, 1.46392822265625),(52.73795463681313, 1.25518798828125)
I split it up before hand.
Without Loop
$Latx = 52.5; //Y Point to test if inside
$LonX = 1.1; //X Point to test if inside
$VTX = $LON; //X array of polygon
$VTY = $LAT; //Y array of polygon
$POINTS = count($VTX) - 1; //number of polygon sides
//=====================================================
if (is_in_polygon($POINTS, $VTX, $VTY, $LonX, $LatY)){
echo "Is in polygon ($LatY,$LonX)";
echo "<br>";
}
else {
echo "Is not in polygon ($LatY,$LonX)";
}
echo "<br>"
function is_in_polygon($POINTS, $VTX, $VTY, $LonX, $LatY)
{
$i = $j = $c = 0;
for ($i = 0, $j = $POINTS ; $i < $POINTS; $j = $i++) {
if ((($VTY[$i] > $LatY != ($VTY[$j] > $LatY)) &&
($LonX < ($VTX[$j] - $VTX[$i]) * ($LatY - $VTY[$i]) /
($VTY[$j] - $VTY[$i]) + $VTX[$i]) ) )
$c = !$c;
}
return $c;
}
Trying with a Loop
for ($x=0; $x<=1000; $x++) {
$QU="SELECT lat,lon FROM DBTable LIMIT $x,1";
$RT=mysql_query($QU,$db);
if (!$RT) {
die("Invalid query: " . mysql_error());
}
while ($row = mysql_fetch_assoc($RT)){
$LonX[$x]=$row["lat"];
$LatY[$x]=$row["lon"];
if (is_in_polygon($POINTS, $VTX, $VTY, $LonX[$x], $LatY{$x])){
echo "Is in polygon ($LatY[$x],$LonX[$x])";
echo "<br>";
}
else echo "Is not in polygon ($LatY[$x],$LonX[$x])";
echo "<br>"
}
}