无法在 html 中显示矩阵

Question

我有一个 php 代码，但不知道如何在 HTML 表中显示它。我创建了矩阵表来进行加法和乘法，但不知道如何将结果放入 HTML 表中。我尝试将代码放在脚本标记之间，但它不起作用。我的矩阵函数基本上生成带有随机整数的 4 x 4 矩阵，并生成两个名为 A 和 B 的矩阵。然后我创建了另外两个函数来对这些矩阵进行加法和乘法，但我没有将它们打印在 HTML 表中。 我的代码：

// creating function addMatrix which takes two numbers and returns a new matrix
function addMatrix($A, $B)
{
    // declaring $ADD as a empty array
    $ADD = array();
    // iterate from i is equal to 0, i is less than 4 and increment i by 1
    for ($i = 0; $i < 4; $i++) {
        // iterate from j is equal to 0, j is less than 4 and increment j by 1
        for ($j = 0; $j < 4; $j++) {
            // adding $A[$i][$j] to $B[$i][$j] and store the result in $ADD[$i][$j]
            $ADD[$i][$j] = $A[$i][$j] + $B[$i][$j];
        }
    }
    // return $ADD
    return $ADD;
}

// creating function mulMatrix which takes two numbers and returns a new matrix
function mulMatrix($A, $B)
{
    // declaring $MUL as a empty array
    $MUL = array();
    // iterate from i is equal to 0, i is less than 4 and increment i by 1
    for ($i = 0; $i < 4; $i++) {
        // iterate from j is equal to 0, j is less than 4 and increment j by 1
        for ($j = 0; $j < 4; $j++) {
            // assign 0 in $MUL[$i][]
            $MUL[$i][] = 0;
            // iterate from k is equal to 0, k is less than 4 and increment k by 1
            for ($k = 0; $k < 4; $k++) {
                // multiply $ADD[$i][$k] with $B[$k][$j] then add it in $MUL[$i][$j] and store it
                // in $MUL[$i][$j]
                $MUL[$i][$j] += $A[$i][$k] * $B[$k][$j];
            }
        }
    }
    // return $MUL
    return $MUL;
}


// generate matrix by calling generateMatrix and store it in $A
$A = generateMatrix();
// generate matrix by calling generateMatrix and store it in $B
$B = generateMatrix();
// add matrix by calling addMatrix and store it in $ADD
$ADD = addMatrix($A, $B);
// mul matrix by calling mulMatrix and store it in $MUL
$MUL = mulMatrix($A, $B);

// create element table and th
echo "<table border='1' cellspacing='0' cellpadding='10'><th colspan=4>Matrix 'A'</th>";
// iterate from i is equal to 0, i is less than 4 and increment i by 1
for ($i = 0; $i < 4; $i++) {
    // create element tr
    echo "<tr>";
    // iterate from j is equal to 0, j is less than 4 and increment j by 1
    for ($j = 0; $j < 4; $j++) {
        // display value of $A[$i][$j] with element td
        echo "<td>" . $A[$i][$j] . "</td>";
    }
    // create element end tr table
    echo "</tr>";
}
// create element end tag table
echo "</table>";
// create element br
echo "<br>";

// create element table and th
echo "<table border='1' cellspacing='0' cellpadding='10'><th colspan=4>Matrix 'B'</th>";
// iterate from j is equal to 0, j is less than 4 and increment j by 1
for ($i = 0; $i < 4; $i++) {
    // create element tr
    echo "<tr>";
    // iterate from j is equal to 0, j is less than 4 and increment j by 1
    for ($j = 0; $j < 4; $j++) {
        // display value of $A[$i][$j] with element td
        echo "<td>" . $B[$i][$j] . "</td>";
    }
    // create element end tr table
    echo "</tr>";
}
// create element end tr table
echo "</table>";


// create element br
echo "<br>";
// create element table and th
echo "<table border='1' cellspacing='0' cellpadding='10'><th colspan=4>Matrix 'A' + 'B'</th>";
// iterate from i is equal to 0, i is less than 4 and increment i by 1
for ($i = 0; $i < 4; $i++) {
    // create element tr
    echo "<tr>";
    // iterate from j is equal to 0, j is less than 4 and increment j by 1
    for ($j = 0; $j < 4; $j++) {
        // display value of $ADD[$i][$j] with element td
        echo "<td>" . $ADD[$i][$j] . "</td>";
    }
    // create element end tr table
    echo "</tr>";
}
// create element end tr table
echo "</table>";

// create element br
echo "<br>";
// create element table and th
echo "<table border='1' cellspacing='0' cellpadding='10'><th colspan=4>Matrix 'A' * 'B'</th>";
// iterate from i is equal to 0, i is less than 4 and increment i by 1
for ($i = 0; $i < 4; $i++) {
    // create element tr
    echo "<tr>";
    // iterate from j is equal to 0, j is less than 4 and increment j by 1
    for ($j = 0; $j < 4; $j++) {
        // display value of $MUL[$i][$j] with element td        
        echo "<td>" . $MUL[$i][$j] . "</td>";
    }
    // create element end tr table
    echo "</tr>";
}
// create element end tr table
echo "</table>";here

Answer 1

我看不到任何HTML标签。也许这是部分代码库，因为也缺少GenerateMatrix的定义。您可以尝试此语法以打印矩阵，

    <!-- create element table and th -->
<table border='1' cellspacing='0' cellpadding='10'>
    <th colspan=4>Matrix 'A'</th>
    <?php
        // iterate from i is equal to 0, i is less than 4 and increment i by 1
        for ($i = 0; $i < 4; $i++) {
            // create element tr
            echo "<tr>";
            // iterate from j is equal to 0, j is less than 4 and increment j by 1
            for ($j = 0; $j < 4; $j++) {
                // display value of $A[$i][$j] with element td
                echo "<td>" . $A[$i][$j] . "</td>";
            }
            // create element end tr table
            echo "</tr>";
        }
    ?>
<!--  create element end tag table -->
</table>
<!-- create element br -->
<br>

<!-- create element table and th -->
<table border='1' cellspacing='0' cellpadding='10'>
    <th colspan=4>Matrix 'B'</th>
    <?php 
        // iterate from j is equal to 0, j is less than 4 and increment j by 1
        for ($i = 0; $i < 4; $i++) {
            // create element tr
            echo "<tr>";
            // iterate from j is equal to 0, j is less than 4 and increment j by 1
            for ($j = 0; $j < 4; $j++) {
                // display value of $A[$i][$j] with element td
                echo "<td>" . $B[$i][$j] . "</td>";
            }
            // create element end tr table
            echo "</tr>";
        }
    ?>
<!-- create element end tr table -->
</table>
<!-- create element br -->
<br>

<!-- create element table and th -->
<table border='1' cellspacing='0' cellpadding='10'>
    <th colspan=4>Matrix 'A' + 'B'</th>
    <?php
        // iterate from i is equal to 0, i is less than 4 and increment i by 1
        for ($i = 0; $i < 4; $i++) {
            // create element tr
            echo "<tr>";
            // iterate from j is equal to 0, j is less than 4 and increment j by 1
            for ($j = 0; $j < 4; $j++) {
                // display value of $ADD[$i][$j] with element td
                echo "<td>" . $ADD[$i][$j] . "</td>";
            }
            // create element end tr table
            echo "</tr>";
        }
    ?>
<!-- create element end tr table -->
</table>

<!-- create element br -->
<br>
<!-- create element table and th -->
<table border='1' cellspacing='0' cellpadding='10'>
    <th colspan=4>Matrix 'A' * 'B'</th>
    <?php
        // iterate from i is equal to 0, i is less than 4 and increment i by 1
        for ($i = 0; $i < 4; $i++) {
            // create element tr
            echo "<tr>";
            // iterate from j is equal to 0, j is less than 4 and increment j by 1
            for ($j = 0; $j < 4; $j++) {
                // display value of $MUL[$i][$j] with element td        
                echo "<td>" . $MUL[$i][$j] . "</td>";
            }
            // create element end tr table
            echo "</tr>";
        }
    ?>

<!-- create element end tr table -->
</table>