php 代替 js实现自定义时间选择器

w

0-php来结合服务端数据，处理前端页面的交互；

1-php 加法 乘法的效率对比，对算术运算的优化。

减少乘法运算？

function w_select($wname, $wii)
{
    $w = '<select class="form-control" name="' . $wname . '">';
    $wtmphour = intval(substr($wii, 0, strlen($wii) - 2));
    $wtmp30 = intval(substr($wii, strlen($wii) - 2, 2));

    $wtmphourb = $wtmphour;
    if ($wtmphour > 12) $wtmphourb = $wtmphour - 12;
    if ($wtmp30 == 0) {
        $wv = $wtmphour * 3600;
        $w .= ' <option value="' . $wv . '" >' . $wtmphourb . ':00</option>';
    }
    $wv = $wtmphour * 3600 + 1800;
    $w .= ' <option value="' . $wv . '" >' . $wtmphourb . ':30</option>';
    $wtmphour += 1;

    if ($wtmphour <= 12) {
        for ($wl = $wtmphour; $wl <= 12; $wl++) {
            $wv = $wl * 3600;
            $w .= ' <option value="' . $wv . '" >' . $wl . ':00' . '</option>';
            $wv = $wl * 3600 + 1800;
            $w .= ' <option value="' . $wv . '" >' . $wl . ':30' . '</option>';
        }

        for ($wl = 1; $wl <= 8; $wl++) {
            $wv = $wl * 3600 + 12 * 3600;
            $w .= ' <option value="' . $wv . '" >' . $wl . ':00' . '</option>';
            $wv = $wl * 3600 + 1800 + 12 * 3600;
            $w .= ' <option value="' . $wv . '" >' . $wl . ':30' . '</option>';
        }

    } else {
        for ($wl = $wtmphour - 12; $wl <= 8; $wl++) {
            $wv = $wl * 3600 + 12 * 3600;
            $w .= ' <option value="' . $wv . '" >' . $wl . ':00' . '</option>';
            $wv = $wl * 3600 + 1800 + 12 * 3600;
            $w .= ' <option value="' . $wv . '" >' . $wl . ':30' . '</option>';
        }
    }

    $w .= ' <option value="9:00">9:00</option>';
    $w .= ' </select>';
    return $w;
}