Question

我有以下代码可以生成一个选择表单，其中包含学年作为选项，例如2010-2011,2011-2012等。

但是，出于某种原因，它产生的选择表格只是增加第一年，而第二年则停留在最后一个数组值，例如2010-2020,2011-2020,2012-2020等。

有人可以帮我理解为什么吗？谢谢！

这是我的代码：

/*
* This function returns the HTML code necessary to be echoed out to produce
* a drop-down box input form for a range of 15 years with the current year selected.
*
* $name    $name is the variable string for the drop-down select form's identifying name
* $prepopulated_info   $prepopulated_info is the year that is to be prepopulated.  The
*                      range of years is populated based on what this number is.
*/
function schoolYearSelectFormGenerator($name, $prepopulated_info) {
    // The current year is the already selected default pre-populated year
    if($prepopulated_info == 'Y')
        $selected = date($prepopulated_info);
    else
        $selected = $prepopulated_info;

    // r is for range of choices
    $r = range(date('Y') - RANGE_OF_YEARS, date('Y') + RANGE_OF_YEARS);

    //create the HTML select
    $string = '<select name="' . $name .  '" id="year" class="form-control">';
    $i = 0;
    $yearPlusOne = array();

    foreach($r as $year)
    {
        $yearPlusOne[$i] = $year + 1;
        $string .= "<option value=\"$year - $yearPlusOne[$i]\" class='normal_select'";
        $string .= ($year - $yearPlusOne[$i] = $selected) ? ' selected="selected"' : '';
        $string .= ">$year - $yearPlusOne[$i]</option>\n";
        $i++;
    }
    $string .= '</select>';
    return $string;
}

Answer 1

修复此部分：

$string .= ($year - $yearPlusOne[$i] = $selected) ? ' selected="selected"' : '';

到

$string .= ($year - $yearPlusOne[$i] == $selected) ? ' selected="selected"' : ''; 
//                                   ^== here.

因为$year - $yearPlusOne[$i] = $selected评估并覆盖了您的$yearPlusOne[$i]值。

Answer 2

将底部附近的循环修改为：

foreach($r as $year)
{
    $yearPlusOne[$i] = $year + 10;
    $string .= "<option value=\"$year - $yearPlusOne[$i]\" class='normal_select'";
    $string .= ($year - $yearPlusOne[$i] = $selected) ? ' selected="selected"' : '';
    $string .= ">$year - $yearPlusOne[$i]</option>\n";
    $i++;
}

我的PHP选择表单生成器未按预期工作

2 个答案: