php 打印乘法口绝表代码

PHP是老师经常会要我们做这个的题目,今天我再做一次打印乘法口决,PHP代码如下:

<?php
/*
 *打印乘法口绝表
*/
echo "九灵九乘法口绝表<br><br><br>";
echo "<table>";
for ($i = 1; $i <= 9; $i++) {
    echo "<tr>";
    for ($j = 1; $j <= $i; $j++) {
        echo "<td>" . $j . "*" . $i . "=" . ($j * $i) . "</td>";
    }
    echo "</tr>";
}
echo "</table>";
echo "<br><br><br><br><br><br>";
echo "<table>";
for ($i = 1; $i <= 9; $i++) {
    echo "<tr>";
    for ($j = $i; $j <= 9; $j++) {
        echo "<td>" . $i . "*" . $j . "=" . ($j * $i) . "</td>";
    }
    echo "</tr>";
}
echo "</table>";
?>

一个简单的求和

<?php
function sum($n) {
    if ($n > 1) {
        return sum($n - 1) + $n;
    } else {
        return 1;
    }
}
echo sum(100);
?>

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