matrix berpasangan

<?php
$criterions=array(
    '1'=>'K1-JP',
    '2'=>'K2-KP',
    '3'=>'K3-JA',
    '4'=>'K4-L'
    );
$relations=array(
    array('1','2',3),
    array('1','3',4),
    array('1','4',2),
    array('2','3',4),
    array('2','4',3),
    array('3','4',5)
);
$rel=array();
foreach($relations as $r){
    $rel[$r[0]][$r[1]]=$r[2];
}
?>
<table border='1'>
<tr>
<th>Kode</th>
<?php
foreach($criterions as $head){
    echo "<th>{$head}</th>";
}
?>
</tr>
<?php
foreach($criterions as $kr=>$row_head){
    echo "<tr><th>{$row_head}</th>";
    foreach($criterions as $kc=>$col){
        $val=round($kr<$kc?$rel[$kr][$kc]:($kr==$kc?1:1/$rel[$kc][$kr]),3);
        echo "<td>{$val}</td>";
    }
    echo "</tr>";
}
?>
</table>