Question

试图将一个3层的学期，班级，学生组成一个等候名单清算页面。这是我用来创建数组的foreach，但有些东西是不对的。结果数组不适合循环并制作一个html表术语＆gt;课程＆gt;学生。我的foreach看起来像这样

    foreach ($active_terms as $term) {
    $waitlists[ $term['term_id'] ] = $term;
        foreach ($active_courses as $course) {
            if ( ($course['term_id'] == $term['term_id']) && ($course['students_waitlisted'] > 0) ) {
            $waitlists[ $term['term_id'] ][ $course['course_id'] ] = $course;                   
                    foreach ($waitlisted_reservations as $reservation) {
                        if ( ($term['term_id'] == $reservation['term_id'])
                                && ($course['course_id'] == $reservation['course_id']) ) {
                            $waitlists[ $term['term_id'] ][ $course['course_id'] ][ $reservation['reservation_id'] ] = $reservation;
                        }   
                    }
            }
        }               
}

并且结果数组很接近，但看起来像这样：

Array
(
[1] => Array
    (
        [term_id] => 1
        [term_title] => Summer Session 1
        [term_begin_date] => June 25 2012
        [3] => Array
            (
                [term_id] => 1
                [course_id] => 3
                [course_title] => Biology 1
                [course_student_limit] => 8
                [students_reserved] => 6
                [students_registered] => 0
                [students_waitlisted] => 3
                [175] => Array
                    (
                        [term_id] => 1
                        [course_id] => 3
                        [reservation_id] => 175
                        [reservation_grade_level] => 12
                        [student_sis_id] => 289055
                    )
                [173] => Array
                    (
                        [term_id] => 1
                        [course_id] => 3
                        [reservation_id] => 173
                        [reservation_grade_level] => 08
                        [student_sis_id] => 111988
                    )
            )
    )
[2] => Array
    (
        [term_id] => 2
        [application_id] => 2
        [term_title] => Summer Session 2
        [term_begin_date] => July 23 2012
        [18] => Array
            ( ....

有人可以指出我如何正确地制作父子巢吗？或者这个数组是否正确，我已经搞砸了如何使用嵌套的foreach来构建表格？

Answer 1

你必须再引入一个级别。例如，替换：

$waitlists[ $term['term_id'] ][ $course['course_id'] ] = $course;

有了这个：

$waitlists[ $term['term_id'] ]['courses'][ $course['course_id'] ] = $course;

<强>更新

为了保持理智，您还可以使用foreach中的引用，例如：

foreach ($active_terms as $term) {
$waitlists[ $term['term_id'] ] = $term;
    foreach ($active_courses as $course) {
        if ( ($course['term_id'] == $term['term_id']) && ($course['students_waitlisted'] > 0) ) {
        $waitlists[ $term['term_id'] ][ $course['course_id'] ] = $course;

也可以写成：

foreach ($active_terms as $term) {
    $waitlists[ $term['term_id'] ] = $term;
    $current_courses = &$waitlists[ $term['term_id'] ]['courses'];

    foreach ($active_courses as $course) {
        if ( ($course['term_id'] == $term['term_id']) && ($course['students_waitlisted'] > 0) ) {
        $current_courses[ $course['course_id'] ] = $course;

缩短变量名称。你可以从那里解决剩下的问题：）

PHP从查询结果构造多维数组

1 个答案: