function isPointInPolygon($poly, $point){
$c = false;
$n = $j = count($poly);
for ($i = 0, $j = $n - 1; $i < $n; $j = $i++){
if ( ( ( ( $poly[$i][0] <= $point[0] ) && ( $point[0] < $poly[$j][0] ) )
|| ( ( $poly[$j][0] <= $point[0] ) && ( $point[0] < $poly[$i][0] ) ) )
&& ( $point[1] < ( $poly[$j][1] - $poly[$i][1] )
* ( $point[0] - $poly[$i][0] )
/ ( $poly[$j][0] - $poly[$i][0] )
+ $poly[$i][1] ) ){
$c = !$c;
}
}
return $c;
}