如何防止每个循环的重复结果？

Question

我使用一个foreach循环来查看与我的自定义post类型关联的自定义分类法。我的问题是，我得到了多个按钮显示的帖子，有超过一个税收期限选择。

我想要做的是循环搜索一个或多个“年龄/年级”，然后用正确的文本和链接显示一个按钮。然而，我得到一个按钮，为每个年级选定的课程(例如，一个3-6级课程有四个按钮:每个适用的等级一个)。

有什么办法防止重复吗？

以下是我的当前代码：

<?php 
$agegroup = wp_get_post_terms(get_the_ID(), 'camper_grade');
    if ($agegroup) {
        foreach ($agegroup as $group) {
            if ($group->slug == 'age-2' || 'age-3' || 'age-4') { ?>
                <a href="/preschool">
                <div class="blue-btn">
                    More Preschool Camps
                </div>
                </a> <?php ;
            }

            elseif ($group->slug == '1st-grade' || '2nd-grade' || '3rd-grade' || '4th-grade' || '5th- 
                    grade' || '6th-grade') { ?>
                <a href="/grades-k-6">
                <div class="blue-btn">
                    More Grade K-6 Camps
                </div>
                </a> <?php ;
            }

            elseif ($group->slug == '7th-grade' || '8th-grade' || '9th-grade' || '10th-grade' || '11th- 
                    grade' || '12th-grade' ) { ?>
                <a href="/teen">
                <div class="blue-btn">
                    More Teen Adventures
                </div>
                </a> <?php ;
            }
        }
    }
?>

Answer 1

找到时使用单独的foreach循环和break。

您的||也是not working how you want it to。您应该使用in_array，它正确地将相同的值与许多其他值进行比较：

<?php 
$agegroup = wp_get_post_terms(get_the_ID(), 'camper_grade');
    if ($agegroup) {
        foreach ($agegroup as $group) {
            if (in_array($group->slug, ['age-2', 'age-3', 'age-4'])) { ?>
                <a href="/preschool">
                <div class="blue-btn">
                    More Preschool Camps
                </div>
                </a> <?php ;
                break;
            }
        }
        foreach ($agegroup as $group) {
            if (in_array($group->slug, ['1st-grade', '2nd-grade', '3rd-grade', '4th-grade', '5th-grade', '6th-grade'])) { ?>
                <a href="/grades-k-6">
                <div class="blue-btn">
                    More Grade K-6 Camps
                </div>
                </a> <?php ;
                break;
            }
        }
        foreach ($agegroup as $group) {
            if (in_array($group->slug, ['7th-grade', '8th-grade', '9th-grade', '10th-grade', '11th-grade', '12th-grade'])) { ?>
                <a href="/teen">
                <div class="blue-btn">
                    More Teen Adventures
                </div>
                </a> <?php ;
                break;
            }
        }
    }
?>

Answer 2

您需要添加一个标志来指示该组是否已经显示了该按钮，如果没有，则只输出该按钮。请注意，您的逻辑条件不正确，需要单独比较slug和每个值(或者更好地使用in_array)。例如：

if ($agegroup) {
    $preschool = $grades_k_6 = $teen = false;
    foreach ($agegroup as $group) {
        if (in_array($group->slug, array('age-2', 'age-3', 'age-4')) && !$preschool) { ?>
            <a href="/preschool">
            <div class="blue-btn">
                More Preschool Camps
            </div>
            </a> <?php ;
            $preschool = true;
        }
        elseif (in_array($group->slug, array('1st-grade', '2nd-grade', '3rd-grade', '4th-grade', '5th-grade', '6th-grade')) && !$grades_k_6) { ?>
            <a href="/grades-k-6">
            <div class="blue-btn">
                More Grade K-6 Camps
            </div>
            </a> <?php ;
            $grades_k_6 = true;
        }
        elseif (in_array($group->slug, array('7th-grade', '8th-grade', '9th-grade', '10th-grade', '11th-grade', '12th-grade')) && !$teen) { ?>
            <a href="/teen">
            <div class="blue-btn">
                More Teen Adventures
            </div>
            </a> <?php ;
            $teen = true;
        }
    }
}