这就是我所拥有的：
[courses] => array
(
array([id]=>1,[name]=>"course_1",[age]=>16,[location]=>"Berlin"),
array([id]=>2,[name]=>"course_1",[age]=>18,[location]=>"Berlin"),
array([id]=>3,[name]=>"course_1",[age]=>20,[location]=>"Berlin"),
array([id]=>4,[name]=>"course_1",[age]=>16,[location]=>"London"),
array([id]=>5,[name]=>"course_1",[age]=>18,[location]=>"Rome"),
array([id]=>6,[name]=>"course_2",[age]=>16,[location]=>"Berlin")
);
我需要将其转换为如下所示的多维数组：
-每个名字可以有多个年龄段
-每个年龄段可以有多个地点
-不需要ID
因此，新的转换数组应该具有具有多个年龄且具有多个位置的课程。
我首先尝试为每个键创建一个数组：
// all courses, sorted, once
$x = 0;
$course_names = array();
foreach ($courses as $item) {
$course_names[$x] = $item['name'];
$x++;
}
$course_names = array_unique($course_names);
sort($course_names);
// all ages, sorted, once
$x = 0;
$ages = array();
foreach ($courses as $item) {
$ages[$x] = $item['age'];
$x++;
}
$ages = array_unique($ages);
sort($ages);
// all locations, sorted, once
$x = 0;
$locations = array();
foreach ($courses as $item) {
$locations[$x] = $item['location'];
$x++;
}
$location = array_unique($location);
sort($location);
然后我尝试根据请求创建另一个数组（别对我发誓，这是许多尝试之一）：
$counter = 0;
foreach ($location as $loc_key=>$loc_val) {
foreach ($ages as $age_key=>$age_val) {
foreach ($course_names as $cou_key=>$cou_val) {
foreach ($courses as $course) {
if ($course['name']==$cou_val) {
if ($course['age']==$age_val) {
if ($course['location']==$loc_val) {
$final_json[$counter]['ages']['locations'][] = $loc_val;
}
$final_json[$counter]['ages'][] = $age_val;
}
$final_json[$counter]['id'] = $course['id'];
$final_json[$counter]['name'] = $cou_val;
$counter++;
}
}
}
}
}
结果数组应该是这样的：
[courses] => array
(
[0] => array
(
[name] => "course_1",
[ages] => array
(
[0] => array
(
[age] => 16,
[locations] => array ([0]=>"Berlin",[1]=>"London")
),
[1] => array
(
[age] => 18,
[locations] => array ([0]=>"Berlin",[1]=>"Rome")
),
[2] => array
(
[age] => 20,
[locations] => array ([0]=>"Berlin")
)
)
)
[1] => array
(
[name] => "course_2",
[ages] => array
(
[0] => array
(
[age] => 16,
[locations] => array ([0]=>"Berlin")
)
)
)
);
我为此奋斗了一段时间，我感到受阻，任何想法都值得欢迎。
答案 0 :(得分：0)
$courses = array(
array("id"=>1,"name"=>"course_1","age"=>16,"location"=>"Berlin"),
array("id"=>2,"name"=>"course_1","age"=>18,"location"=>"Berlin"),
array("id"=>3,"name"=>"course_1","age"=>20,"location"=>"Berlin"),
array("id"=>4,"name"=>"course_1","age"=>16,"location"=>"London"),
array("id"=>5,"name"=>"course_1","age"=>18,"location"=>"Rome"),
array("id"=>6,"name"=>"course_2","age"=>16,"location"=>"Berlin"),
);
foreach ($courses as $item) {
$course_age[] = $item['age'];
$course_names[] = $item['name'];
$course_location[] = $item['location'];
}
$course_age = array_unique($course_age);
$course_names = array_unique($course_names);
$course_location = array_unique($course_location);
$finalArray = array();
$finalArrayKey=0;
foreach ($course_names as $key => $courseValue) {
foreach ($courses as $key => $actualValue) {
if($actualValue['name']==$courseValue){
$finalArray[$finalArrayKey]['name'] = $courseValue;
$finalArray[$finalArrayKey]['ages'] = array();
$finalArray[$finalArrayKey]['ages']['location'] = array();
}
}
foreach ($courses as $key => $actualValue) {
if($actualValue['name']==$courseValue){
if(!in_array($actualValue['age'], $finalArray[$finalArrayKey]['ages']))
$finalArray[$finalArrayKey]['ages'][] = $actualValue['age'];
if(!in_array($actualValue['location'], $finalArray[$finalArrayKey]['ages']['location']))
$finalArray[$finalArrayKey]['ages']['location'][] = $actualValue['location'];
}
}
++$finalArrayKey;
}
echo "<pre>";
print_r($finalArray);
样本输出：
Array
(
[0] => Array
(
[name] => course_1
[ages] => Array
(
[location] => Array
(
[0] => Berlin
[1] => London
[2] => Rome
)
[0] => 16
[1] => 18
[2] => 20
)
)
[1] => Array
(
[name] => course_2
[ages] => Array
(
[location] => Array
(
[0] => Berlin
)
[0] => 16
)
)
)
答案 1 :(得分：0)
为简单起见，决定修改finalArray的输出。
新的finalArray如下所示：
Array
(
[course_1] => Array
(
[ages] => Array
(
[16] => Array
(
[locations] => Array
(
[0] => Berlin
[1] => London
)
),
[18] => Array
(
[locations] => Array
(
[0] => Berlin
[1] => Rome
)
),
[20] => Array
(
[locations] => Array
(
[0] => Berlin
)
)
)
),
[course_2] => Array
(
[ages] => Array
(
[16] => Array
(
[locations] => Array
(
[0] => Berlin
)
)
)
)
)
这是代码：
foreach ($courses as $item) {
$course_names[] = $item['name'];
}
$course_names = array_unique($course_names);
sort($course_names);
$finalArray = array();
foreach ($course_names as $key => $courseValue) {
foreach ($courses as $key => $actualValue) {
if($actualValue['name']==$courseValue) {
$finalArray[$courseValue] = array();
$finalArray[$courseValue]['id'] = $actualValue['id'];
$finalArray[$courseValue]['ages'] = array();
}
}
foreach ($courses as $key => $actualValue) {
if($actualValue['name']==$courseValue) {
if(!array_key_exists($actualValue['age'],$finalArray[$courseValue]['ages'])) {
$finalArray[$courseValue]['ages'][$actualValue['age']] = array ();
}
}
}
}
foreach ($finalArray as $course_name=>$arr) {
foreach ($arr['ages'] as $age=>$arr2) {
foreach($courses as $item) {
if($item['name'] == $course_name && $item['age'] == $age && !in_array($item['location'], $finalArray[$course_name]['ages'][$age]['locations'])) {
$finalArray[$course_name]['ages'][$age]['locations'][] = $item['location'];
}
}
}
}
答案 2 :(得分：-1)
不确定要查找的格式是什么，但是请看一下：
$courses = array
(
array('id'=>1, 'name' =>"course_1",'age'=>16,'location'=>"Berlin"),
array('id'=>2,'name'=>"course_1",'age'=>18,'location'=>"Berlin"),
array('id'=>3,'name'=>"course_1",'age'=>20,'location'=>"Berlin"),
array('id'=>4,'name'=>"course_1",'age'=>16,'location'=>"London"),
array('id'=>5,'name'=>"course_1",'age'=>18,'location'=>"Rome"),
array('id'=>6,'name'=>"course_2",'age'=>16,'location'=>"Berlin")
);
$newCourses = [];
foreach ($courses as $item){
$newCourses[$item['name']]['ages'][$item['age']]['locations'][] = $item['location'];
}
$ new课程将是：
array (
'course_1' =>
array (
'ages' =>
array (
16 =>
array (
'locations' =>
array (
0 => 'Berlin',
1 => 'London',
),
),
18 =>
array (
'locations' =>
array (
0 => 'Berlin',
1 => 'Rome',
),
),
20 =>
array (
'locations' =>
array (
0 => 'Berlin',
),
),
),
),
'course_2' =>
array (
'ages' =>
array (
16 =>
array (
'locations' =>
array (
0 => 'Berlin',
),
),
),
),
)
即使这不是您想要的格式，您也可以使用它来获得所需的格式。