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在php中的if条件中发出
EN

Stack Overflow用户
提问于 2018-06-21 04:44:29
回答 2查看 38关注 0票数 0

我正在用php和html构建一个项目,我想让一个函数有一些if条件和另一个条件。

有三种情况,其中一种不起作用,我肯定这是真的,我试着回应它的表达式,这是真的,它返回的结果不像echo '';

我已经在有问题的其他I旁边发表了评论。

注意:所有其他条件都很好,并且可以正常工作。

代码:

代码语言:javascript
复制
<?php
require_once '../../router.php';
require_once '../../'.router('function', 'mini');
require_once '../../'.router('mysql', 'db');
function groups_checker()
{
    if(!empty($_SERVER['HTTP_X_REQUESTED_WITH']) && strtolower($_SERVER['HTTP_X_REQUESTED_WITH']) == 'xmlhttprequest')
    {
        if(isset($_GET['grade']))
        {
            global $db;
            $get_groups_select_query = $db->query("SELECT * FROM `groups` WHERE g_grade = '".$_GET['grade']."' ORDER BY `g_max_num` DESC"); // Checking groups existence.
            if(mysqli_num_rows($get_groups_select_query) > 0)
            {
                $get_groups_select_query_fetch = $get_groups_select_query->fetch_array(MYSQLI_ASSOC); // Fetching data after true existence.
                ?>
                <h3>We've found <?= mysqli_num_rows($get_groups_select_query) > 1 ? mysqli_num_rows($get_groups_select_query).' groups ' : ' just a group ' ?> exist, take a look if appropriate. Or <a href="#">Create one?</a></h3>
                <table width="100%" border="1" class="managing_brdr">
                    <tr class="titles_manage_group_main">
                        <td rowspan="2">Group Symbol</td>
                        <td rowspan="2">Group name</td>
                        <td rowspan="2">Group grade</td>
                        <td colspan="4">Appointments</td>
                        <td rowspan="2">Remaining places</td>
                    </tr>
                    <tr class="titles_manage_group_main">
                        <td>First day</td>    
                        <td>Time</td>    
                        <td>Second day</td>    
                        <td>Time</td>    
                    </tr>
                    <tr>
                        <td class="td_centering"><?= $get_groups_select_query_fetch['g_symbol']; ?></td>
                        <td><?= $get_groups_select_query_fetch['g_name']; ?></td>
                        <td class="td_centering"><?= $get_groups_select_query_fetch['g_grade']; ?></td>
                        <td class="td_centering"><?= $get_groups_select_query_fetch['g_fst_day']; ?></td>
                        <td class="td_centering"><?= dateConverter($get_groups_select_query_fetch['g_fst_d_time']); ?></td>
                        <td class="td_centering"><?= $get_groups_select_query_fetch['g_sec_day']; ?></td>
                        <td class="td_centering"><?= dateConverter($get_groups_select_query_fetch['g_sec_d_time']); ?></td>
                        <td class="td_centering">
                        <?php
                        if(empty($get_groups_select_query_fetch['g_max_num']))
                        {
                            ?>
                            It's unlimited. <a href="<?= '../../'.router('sections', 'students').'?action=new_student&steps=second&grade='.$get_groups_select_query_fetch['g_grade'] ?>">Add</a>
                            <?php
                        }
                        elseif(intval($get_groups_select_query_fetch['g_max_num']) > intval($get_groups_select_query_fetch['g_student_number']))
                        {
                            if(intval($get_groups_select_query_fetch['g_max_num']) - intval($get_groups_select_query_fetch['g_student_number']) == 1)
                            {
                                ?>
                                Just 1 place left. <a href="<?= '../../'.router('sections', 'students').'?action=new_student&steps=second&grade='.$get_groups_select_query_fetch['g_grade'] ?>">Add<a>
                                <?php
                            }
                            elseif(intval($get_groups_select_query_fetch['g_max_num']) == intval($get_groups_select_query_fetch['g_student_number'])) // **the issue here.**
                            {
                                ?>
                                It's Full. <a href="">Make an exception</a>
                                <?php
                            }
                            else
                            {
                                echo intval($get_groups_select_query_fetch['g_max_num']) - intval($get_groups_select_query_fetch['g_student_number']) . ' places left. <a href="'.'../../'.router('sections', 'students').'?action=new_student&steps=second&grade='.$get_groups_select_query_fetch['g_grade'].'">Add<a>';
                            }
                        }
                        ?>
                        </td>
                    </tr>    
                <table>
                <?php
            }
            else
            {
                if(!empty($_GET['grade']))
                {
                    alerts('error', 'We didn\'t find any group in '.strtolower($_GET['grade']).', <a href="#">Create one?</a>');
                }
            }
        }
    }
}
groups_checker();
?>
EN

回答 2

Stack Overflow用户

发布于 2018-06-21 05:05:12

问题elseif在另一个矛盾的elseif中。您必须:

代码语言:javascript
复制
if(empty($get_groups_select_query_fetch['g_max_num']))
{
    ?>
    It's unlimited. <a href="<?= '../../'.router('sections', 'students').'?action=new_student&steps=second&grade='.$get_groups_select_query_fetch['g_grade'] ?>">Add</a>
    <?php
}
elseif(intval($get_groups_select_query_fetch['g_max_num']) > intval($get_groups_select_query_fetch['g_student_number']))
{
    if(intval($get_groups_select_query_fetch['g_max_num']) - intval($get_groups_select_query_fetch['g_student_number']) == 1)
    {
        ?>
        Just 1 place left. <a href="<?= '../../'.router('sections', 'students').'?action=new_student&steps=second&grade='.$get_groups_select_query_fetch['g_grade'] ?>">Add<a>
        <?php
    }
    elseif(intval($get_groups_select_query_fetch['g_max_num']) == intval($get_groups_select_query_fetch['g_student_number'])) // **the issue here.**
    {
        ?>
        It's Full. <a href="">Make an exception</a>
        <?php
    }
    else
    {
        echo intval($get_groups_select_query_fetch['g_max_num']) - intval($get_groups_select_query_fetch['g_student_number']) . ' places left. <a href="'.'../../'.router('sections', 'students').'?action=new_student&steps=second&grade='.$get_groups_select_query_fetch['g_grade'].'">Add<a>';
    }
}

我想你想要的是:

代码语言:javascript
复制
if(empty($get_groups_select_query_fetch['g_max_num']))
{
    ?>
    It's unlimited. <a href="<?= '../../'.router('sections', 'students').'?action=new_student&steps=second&grade='.$get_groups_select_query_fetch['g_grade'] ?>">Add</a>
    <?php
}
elseif(intval($get_groups_select_query_fetch['g_max_num']) - intval($get_groups_select_query_fetch['g_student_number']) == 1)
{
    ?>
    Just 1 place left. <a href="<?= '../../'.router('sections', 'students').'?action=new_student&steps=second&grade='.$get_groups_select_query_fetch['g_grade'] ?>">Add<a>
    <?php
}
elseif(intval($get_groups_select_query_fetch['g_max_num']) == intval($get_groups_select_query_fetch['g_student_number'])) // **the issue here.**
{
    ?>
    It's Full. <a href="">Make an exception</a>
    <?php
}
elseif(intval($get_groups_select_query_fetch['g_max_num']) > intval($get_groups_select_query_fetch['g_student_number']))
{
    echo intval($get_groups_select_query_fetch['g_max_num']) - intval($get_groups_select_query_fetch['g_student_number']) . ' places left. <a href="'.'../../'.router('sections', 'students').'?action=new_student&steps=second&grade='.$get_groups_select_query_fetch['g_grade'].'">Add<a>';
}
票数 0
EN

Stack Overflow用户

发布于 2018-06-21 05:01:38

在出现问题的地方使用(int)代替(intval)。

票数 -1
EN
页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接:

https://stackoverflow.com/questions/50956765

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