如何计算嵌套数组的元素?我想计算$student_info['Aptitude']的元素。
我尝试了以下内容,并在以下代码中获得了未定义的索引:
else if (count($student_info["Aptitude"])==0){ //no records for report card
$this->Session->setFlash('Your child is a new student in our school.
He/She doesn''t have records for a report card yet.');
$this->redirect(array('controller'=>'pages','action'=>'home'));
Aptitude 是 $student_info 中的一个数组,它有 4 个数组
var_dump($student_info) 生成以下输出。能力倾向数组在最后一行。它没有任何元素:
array(1) {
[0]=> array(4) {
["Student"]=> array(10) {
["id"]=> string(2) "20"
["name"]=> string(15) "Uma Palaniappan"
["gender"]=> string(6) "Female"
["dob"]=> string(10) "2007-04-26"
["created"]=> string(19) "2011-12-29 10:14:03"
["modified"]=> string(19) "2011-12-29 10:14:03"
["merry_class_id"]=> string(1) "3"
["merry_parent_id"]=> string(2) "25"
["term1_comments"]=> NULL
["term2_comments"]=> NULL
}
["MerryParent"]=> array(14) {
["id"]=> string(2) "25"
["initial"]=> string(2) "Mr"
["name"]=> string(13) "Palaniappan K"
["username"]=> string(7) "kpalani"
["email"]=>string(20) "kpalani@streamyx.com"
["password"]=> string(40) "43f5e1298f3b2478a9cd4ab7c6f5f703380dbcc9"
["landline"]=> string(12) "044-77223399"
["mobile"]=> string(10) "9860662309"
["address"]=> string(15) "44 Megala Chowk"
["state_id"]=> string(1) "6"
["city_id"]=> string(3) "103"
["postal_code"]=> string(6) "384733"
["created"]=> string(19) "2011-12-29 10:14:03"
["modified"]=> string(19) "2011-12-29 10:52:23"
}
["MerryClass"]=> array(2) {
["id"]=> string(1) "3"
["class_name"]=> string(3) "LKG"
}
["Aptitude"]=> array(0) {
}
}
}
谢谢。
使用
if (count($student_info[0]["Aptitude"])==0)
相反。下次请自行格式化示例代码。你可以很容易地自己发现这个错误。
考虑使用 xdebug 为var_dump
提供更具可读性的输出。
else if (count($student_info[0]["Aptitude"])==0){ //no records for report card
$this->Session->setFlash('Your child is a new student in our school.
He/She doesn''t have records for a report card yet.');
$this->redirect(array('controller'=>'pages','action'=>'home'));
您忘记了 [0] 索引。
试试这个:
count(Set::extract('/Aptitude', $student_info))