问如何使用IF命令在表上显示不同的信息？

EN

<a href='?l=a'>A</a>

<a href='?l=b'>B</a>

<?php
$sLetter = null;
if (isset($_GET['l'])) {
    $sLetter = strtolower($_GET['l']);
}
switch ($sLetter) {
    case 'a':
        echo "Information related to A";
        break;
    case 'b':
        echo "Information related to B";
        break;
    // Continue in a similar way for the remaining letters
    default:
        echo "No information..."; // or perhaps show all A-Z information
        break;
}