如何在php中获得json键值?

Question

我如何得到所有的键值在这个JSON PHP?我的PHP代码是:

<?php 
$json = json_decode('{
"data": {
"after": [{
"google.com": "35"
}, {
"yahoo.com": "10"
}, {
"worldi.ir": "30"
}, {
"cnn.com": "554"
}, {
"scio.ir": "887"
}],
"before": [{
"bbc.com": "44"
}, {
"rtl.com": "15"
}, {
"quran.com": "9"
}, {
"lap.com": "12"
}, {
"search.com": "13"
}]
}
}');
foreach($json->data->after as $key => $value) {
echo "$key<br/>";
foreach(((array)$json->data->after)[$key] as $val) {
echo "$val<br/>";
}
}
?>

结果

0
35
1
10
2
30
3
554
4
887

不显示键值。我想获取所有键值。比如google.com, yahoo.com, worldi。是cnn.com，还有…

Answer 1

after是一个数组，因此外部foreach循环返回的$key只是一个索引(一个整数)。您应该在第二次foreach中再次包含$key => $value，以获得每个内部对象的键。此外，您可以在第一个foreach的$value上使用foreach。您不必再次指定到它的整个密钥路径。

<?php 
$json = json_decode('{
"data": {
"after": [{
"google.com": "35"
}, {
"yahoo.com": "10"
}, {
"worldi.ir": "30"
}, {
"cnn.com": "554"
}, {
"scio.ir": "887"
}],
"before": [{
"bbc.com": "44"
}, {
"rtl.com": "15"
}, {
"quran.com": "9"
}, {
"lap.com": "12"
}, {
"search.com": "13"
}]
}
}');
foreach($json->data->after as $key => $value) {
foreach($value as $k => $val) {
echo "$k<br/>$val<br/>";
}
}
?>

Answer 2

试试这个解决方案:

<?php
$json = json_decode('{
"data": {
"after": [{
"google.com": "35"
}, {
"yahoo.com": "10"
}, {
"worldi.ir": "30"
}, {
"cnn.com": "554"
}, {
"scio.ir": "887"
}],
"before": [{
"bbc.com": "44"
}, {
"rtl.com": "15"
}, {
"quran.com": "9"
}, {
"lap.com": "12"
}, {
"search.com": "13"
}]
}
}');

foreach($json->data->after as $key => $value) {
echo key($json->data->after[$key]);

foreach(((array)$json->data->after)[$key] as $val) {
echo "$val<br/>";
}
}

Answer 3

试试这个:

<?php 
$json = json_decode('{
"data": {
"after": [{
"google.com": "35"
}, {
"yahoo.com": "10"
}, {
"worldi.ir": "30"
}, {
"cnn.com": "554"
}, {
"scio.ir": "887"
}],
"before": [{
"bbc.com": "44"
}, {
"rtl.com": "15"
}, {
"quran.com": "9"
}, {
"lap.com": "12"
}, {
"search.com": "13"
}]
}
}');
foreach($json->data as $key1 => $value1) {
echo "$key1: n";
foreach($value1 as $key2 => $value2) {
echo "$key2 -> ";
foreach($value2 as $key3 => $value3) {
echo "$key3 -> $value3n";
}
}
}
?>

输出:

after: 
0 -> google.com -> 35
1 -> yahoo.com -> 10
2 -> worldi.ir -> 30
3 -> cnn.com -> 554
4 -> scio.ir -> 887
before: 
0 -> bbc.com -> 44
1 -> rtl.com -> 15
2 -> quran.com -> 9
3 -> lap.com -> 12
4 -> search.com -> 13