- explode: documentation ( source)
<?php
$row = "LAX/SAF/ORL";
$row2 = "ORL/SFO";
$from = explode('/', $row);
$to = explode('/', $row2);
foreach ($from as $f){
foreach($to as $t) {
echo $f . " -> " . $t . "<br />";
}
}