我试图在PHP中制作矩阵乘法代码，但不是矩阵乘法，它只是简单的乘法与行和列

Question

I want to do matrix multiplication using array in PHP I have trying to do same but instead of matrix multiplication it just happening Simple multiplication as per output please help me to resolve it.

Here is my code:

<?php
$a1 = Array('0' => Array('0' => 1,'1' => 2),'1' => Array('0' => 4,'1' => 5));

$a2 = Array('0' => Array('0' => 7,'1' => 5),'1' => Array('0' => 3,'1' => 2));

$sumArray = array();

$result = array();
for($i=0; $i<=1; $i++)
{
    for($j=0; $j<=1; $j++)
    {
        $result[$i][$j] = $a1[$i][$j] * $a2[$i][$j];
    }
}
echo "<pre/>";
print_r($result);
?>

Output:

array image

Answer 1

<?php



$a = Array('0' => Array('0' => 1,'1' => 2),'1' => Array('0' => 4,'1' => 5));


$b = Array('0' => Array('0' => 7,'1' => 5),'1' => Array('0' => 3,'1' => 2));

$sumArray = array();

$c = array();

for($i=0;$i<2;$i++) {
 for($j=0;$j<2;$j++) 
 { 
    $c[$i][$j]=0; 
    for($k=0;$k<2;$k++) 
        { $c[$i][$j]=$c[$i][$j]+($a[$i][$k]*$b[$k][$j]); 
    } 
} 
} 


echo "<pre/>";
print_r($c);
?>