From the php-geospatial extension:


<?php
$jebLon = 45.74;
$jebLat = -47.11;
echo "Jeb lives at $jebLon, $jebLat\n";

$kspLon = dms_to_decimal(74, 34, 31, 'W');
$kspLat = dms_to_decimal(0, 6, 9, 'S');
echo "KSP is at $kspLon, $kspLat\n";
?>
Output
Jeb lives at 45.74, -47.11