具体执行代码如下：
实例
<!DOCTYPE html>
<html lang="en">
<head>
<meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1, user-scalable=no">
<meta charset="UTF-8">
<title>PHP九九乘法表</title>
</head>
<body style="width: 90%; margin: 50px">
<table border="1" align="center" width="80%">
<?php
$table = '';
for($r=1;$r<=9;$r++){
//一共9行，每行输出一个tr
$table .= "<tr align='center'>";
//到第几行就有几列，所以要让列数小于等于行数，即$c<=$r
for($c=1;$c<=$r;$c++){
//计算每一个表格中的乘积
$sum = $r*$c;
//输出td
$table .= "<td>{$c}*{$r}={$sum}</td>";
}
$table .= "</tr>";
}
echo $table;
?>
</table>
</body>运行实例 »
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