$baseUrl = "https://example.com/page.php";
$param1 = "value1";
$param2 = "value2";

$url = $baseUrl . "?param1=" . urlencode($param1) . "&param2=" . urlencode($param2);
echo '<a href="' . htmlspecialchars($url) . '">Link</a>';

$params = array(
    'param1' => 'value1',
    'param2' => 'value2'
);

$url = "https://example.com/page.php?" . http_build_query($params);
echo '<a href="' . htmlspecialchars($url) . '">Link</a>';

$value = "Hello & World?";
$url = "page.php?text=" . urlencode($value);

$params = array(
    'ids' => array(1, 2, 3)
);
$url = "page.php?" . http_build_query($params);
// 生成: page.php?ids[0]=1&ids[1]=2&ids[2]=3