<?php
function
lower(
$matrix
,
$row
,
$col
)
{
$i
;
$j
;
for
(
$i
= 0;
$i
<
$row
;
$i
++)
{
for
(
$j
= 0;
$j
<
$col
;
$j
++)
{
if
(
$i
<
$j
)
{
echo
"0"
,
" "
;
}
else
echo
$matrix
[
$i
][
$j
] ,
" "
;
}
echo
"\n"
;
}
}
function
upper(
$matrix
,
$row
,
$col
)
{
$i
;
$j
;
for
(
$i
= 0;
$i
<
$row
;
$i
++)
{
for
(
$j
= 0;
$j
<
$col
;
$j
++)
{
if
(
$i
>
$j
)
{
echo
"0"
,
" "
;
}
else
echo
$matrix
[
$i
][
$j
] ,
" "
;
}
echo
"\n"
;
}
}
$matrix
=
array
(
array
(1, 2, 3),
array
(4, 5, 6),
array
(7, 8, 9));
$row
= 3;
$col
= 3;
echo
"Lower triangular matrix: \n"
;
lower(
$matrix
,
$row
,
$col
);
echo
"Upper triangular matrix: \n"
;
upper(
$matrix
,
$row
,
$col
);
?>