我需要帮助才能在PHP foreach
循环中操作多维数组。我有下面的数组:
$sports = [
[
"id" => "soccer",
"name" => "Football",
"categories" => [
[
"id" => "s1",
"name" => "category 1",
"sportID" => "soccer"
],
[
"id" => "s2",
"name" => "category 2",
"sportID" => "soccer"
],
],
"img" => "/test.png"
],
[
"id" => "tennis",
"name" => "Tennis",
"categories" => [
[
"id" => "t1",
"name" => "category 1",
"sportID" => "tennis"
],
[ "id" => "t2",
"name" => "category 2",
"sportID" => "tennis"
],
],
"img" => "/test.png"
],
];
我有以下foreach
,以便为每项运动采取相应类别的所有运动,
foreach($sports as $s){
$categories = $s['categories'];
foreach($categories as $c){
$cats[] = [
"id" => $c['id'],
"name" => $c['name'],
"sportID" => $s['id'],
];
}
$allCategories[] = $cats;
$data[] = [
"id" => $s['id'],
"name" => $s['name'],
"categories" => $cats,
"img" => $s['img'],
];
$output[] = $data;
}
但产量不是我的预期;相反,我得到的重复结果如下:
array(2) {
[0]=>
array(1) {
[0]=>
array(4) {
["id"]=>
string(8) "soccer"
["name"]=>
string(8) "Football"
["categories"]=>
array(2) {
[0]=>
array(3) {
["id"]=>
string(2) "s1"
["name"]=>
string(10) "category 1"
["sportID"]=>
string(8) "soccer"
}
[1]=>
array(3) {
["id"]=>
string(2) "s2"
["name"]=>
string(10) "category 2"
["sportID"]=>
string(8) "soccer"
}
}
["img"]=>
string(9) "/test.png"
}
}
[1]=>
array(2) {
[0]=>
array(4) {
["id"]=>
string(8) "soccer"
["name"]=>
string(8) "Football"
["categories"]=>
array(2) {
[0]=>
array(3) {
["id"]=>
string(2) "s1"
["name"]=>
string(10) "category 1"
["sportID"]=>
string(8) "soccer"
}
[1]=>
array(3) {
["id"]=>
string(2) "s2"
["name"]=>
string(10) "category 2"
["sportID"]=>
string(8) "soccer"
}
}
["img"]=>
string(9) "/test.png"
}
[1]=>
array(4) {
["id"]=>
string(10) "tennis"
["name"]=>
string(8) "Tennis"
["categories"]=>
array(4) {
[0]=>
array(3) {
["id"]=>
string(2) "s-1"
["name"]=>
string(10) "category 1"
["sportID"]=>
string(8) "soccer"
}
[1]=>
array(3) {
["id"]=>
string(2) "s2"
["name"]=>
string(10) "category 2"
["sportID"]=>
string(8) "soccer"
}
[2]=>
array(3) {
["id"]=>
string(2) "t1"
["name"]=>
string(10) "category 1"
["sportID"]=>
string(10) "tennis"
}
[3]=>
array(3) {
["id"]=>
string(2) "t2"
["name"]=>
string(10) "category 2"
["sportID"]=>
string(10) "tennis"
}
}
["img"]=>
string(9) "/test.png"
}
}
}
你可以想象这不是正确的输出,因为在网球的类别中你也可以看到足球的类别。我怎样才能纠正我的foreach
循环以获得正确的输出?
你忘了重置$cats
和$data
数组。
<?php
$sports = [
[
"id" => "soccer",
"name" => "Football",
"categories" => [
[
"id" => "s1",
"name" => "category 1",
"sportID" => "soccer"
],
[
"id" => "s2",
"name" => "category 2",
"sportID" => "soccer"
],
],
"img" => "/test.png"
],
[
"id" => "tennis",
"name" => "Tennis",
"categories" => [
[
"id" => "t1",
"name" => "category 1",
"sportID" => "tennis"
],
[ "id" => "t2",
"name" => "category 2",
"sportID" => "tennis"
],
],
"img" => "/test.png"
],
];
foreach($sports as $s){
$categories = $s['categories'];
# before inner loop we need to reset both arrays
$cats = [];
$data = [];
foreach($categories as $c){
$cats[] = [
"id" => $c['id'],
"name" => $c['name'],
"sportID" => $s['id'],
];
}
$allCategories[] = $cats;
$data[] = [
"id" => $s['id'],
"name" => $s['name'],
"categories" => $cats,
"img" => $s['img'],
];
$output[] = $data;
}
echo '<PRE>';
print_r($output);