I'm sure I'm missing something obvious here: the following is echoing lat-long variables from MySQL, and the longitude variable begins with a minus sign, which prevents the echo statement from reading it and all that follows it. I'm sure there is a way to clean/escape that but just can't work it out.
echo "
http://maps.google.com/maps?ll=" . $row['latitude'] . "," . $row['longitude'] . " target=_new>View in Google Maps";
This is output from a PDO query and testing passing the lat-long into Google Maps.
As I understand, it's a link?
Then, use urlencode for string.
The minus signs are not a problem. You may need to urlencode() because of the comma, but you need quotes around the URL in the href as well:
echo '<br /><a href="http://maps.google.com/maps?ll='
. urlencode($row['latitude'] . ',' . $row['longitude'])
. '" target="_new">View in Google Maps</a>';