php - 如何用for的双层循环来控制隔行变色的表格

Question

初学php小白一枚，恳请热心的人儿帮忙解答一下如题(◐﹏◐)
单层循环如下：

效果图如下：

想问一下如何用for的双层循环得到上面一样的效果图？

Answer 1

echo '<table border="1">';
for($i = 1; $i < 10; $i++) {
    echo $i%2 === 0 ? '<tr bgcolor="#ccc">' : '<tr>';
    for($j = 1; $j < 5; $j++) {
        echo "<td>$i$j</td>";
    }
    echo '</tr>';
}
echo '</table>';

In fact, writing this in php is a waste of resources. In actual projects, it is recommended to use the CSS3 pseudo-class nth-child to complete this function

Answer 2

I suggest you take a look at how bootstrap handles the color change of each row. Take a look at its table part