p8b.php

<?php

$a = array(array(1,2,3),array(4,5,6),array(7,8,9));
$b = array(array(7,8,9),array(4,5,6),array(1,2,3));
$m=count($a);
$n=count($a[2]);
$p=count($b);
$q=count($b[2]);
echo "the first matrix :"."<br/>"; 

for ($row = 0; $row < $m; $row++) 
{
	for ($col = 0; $col < $n; $col++) 
		echo " ".$a[$row][$col];

echo "<br/>";
}
echo "the second matrix :"."<br/>"; 
for ($row = 0; $row < $p; $row++) 
{
	for ($col = 0; $col < $q; $col++) 
		echo " ".$b[$row][$col];

echo "<br/>";
}
echo "the transpose for the first matrix is:"."<br/>"; 
for ($row = 0; $row < $m; $row++) 
{
	for ($col = 0; $col < $n; $col++) 
		echo " ".$a[$col][$row];

echo "<br/>";
}

if(($m===$p) and ($n===$q)) 
{
	echo "the addition of matrices is:"."<br/>"; 
	for ($row = 0; $row < 3; $row++) 
	{
		for ($col = 0; $col < 3; $col++)
			echo " ".$a[$row][$col]+$b[$row][$col]." "; echo "<br/>";
	}
}

if($n===$p)
{
	echo " The multiplication of matrices: <br/>";
	$result=array();
	for ($i=0; $i < $m; $i++) 
	{
		for($j=0; $j < $q; $j++)
		{
			$result[$i][$j] = 0; 
			for($k=0; $k < $n; $k++)
				$result[$i][$j] += $a[$i][$k] * $b[$k][$j];
		}
	}
	for ($row = 0; $row < $m; $row++) 
	{
		for ($col = 0; $col < $q; $col++)
			echo " ".$result[$row][$col]; echo "<br/>";
	}
}
?>