为什么 array_merge_recursive() 不返回所需的输出 PHP
[英]Why is array_merge_recursive() not returning required output PHP
问题描述
I have the following string that I am trying to combine the inner array stop recursively and print the result as json data but seems like the array_merge_recursive() function is not producing the desired output.
我有以下字符串，我试图递归地组合内部数组停止并将结果打印为 json 数据，但似乎array_merge_recursive()函数没有产生所需的输出。
The result I am getting whenever I run the code is the same.每次运行代码时得到的结果都是一样的。 Am I missing something or is there an alternative function to achieve combining the inner array?我是否遗漏了什么或者是否有替代函数来实现组合内部数组？
$routes = '[
{
"id": "1",
"name": "CBD - Ngumba via Thika Road",
"stop": [
{
"id": "1",
"name": "City Centre (Pangani)"
}
]
},
{
"id": "1",
"name": "CBD - Ngumba via Thika Road",
"stop": [
{
"id": "2",
"name": "Muthaiga"
}
]
},
{
"id": "1",
"name": "CBD - Ngumba via Thika Road",
"stop": [
{
"id": "3",
"name": "Utalii"
}
]
},
{
"id": "1",
"name": "CBD - Ngumba via Thika Road",
"stop": [
{
"id": "4",
"name": "KCA"
}
]
},
{
"id": "1",
"name": "CBD - Ngumba via Thika Road",
"stop": [
{
"id": "5",
"name": "Drive Inn"
}
]
},
{
"id": "1",
"name": "CBD - Ngumba via Thika Road",
"stop": [
{
"id": "6",
"name": "Allsops"
}
]
},
{
"id": "1",
"name": "CBD - Ngumba via Thika Road",
"stop": [
{
"id": "7",
"name": "GSU"
}
]
},
{
"id": "1",
"name": "CBD - Ngumba via Thika Road",
"stop": [
{
"id": "8",
"name": "Roasters"
}
]
},
{
"id": "1",
"name": "CBD - Ngumba via Thika Road",
"stop": [
{
"id": "9",
"name": "Ngumba"
}
]
},
{
"id": "2",
"name": "Ngumba - City Centre via Thika Road",
"stop": [
{
"id": "1",
"name": "City Centre (Pangani)"
}
]
},
{
"id": "2",
"name": "Ngumba - City Centre via Thika Road",
"stop": [
{
"id": "2",
"name": "Muthaiga"
}
]
},
{
"id": "2",
"name": "Ngumba - City Centre via Thika Road",
"stop": [
{
"id": "3",
"name": "Utalii"
}
]
},
{
"id": "2",
"name": "Ngumba - City Centre via Thika Road",
"stop": [
{
"id": "4",
"name": "KCA"
}
]
},
{
"id": "2",
"name": "Ngumba - City Centre via Thika Road",
"stop": [
{
"id": "5",
"name": "Drive Inn"
}
]
},
{
"id": "2",
"name": "Ngumba - City Centre via Thika Road",
"stop": [
{
"id": "6",
"name": "Allsops"
}
]
},
{
"id": "2",
"name": "Ngumba - City Centre via Thika Road",
"stop": [
{
"id": "7",
"name": "GSU"
}
]
},
{
"id": "2",
"name": "Ngumba - City Centre via Thika Road",
"stop": [
{
"id": "8",
"name": "Roasters"
}
]
},
{
"id": "2",
"name": "Ngumba - City Centre via Thika Road",
"stop": [
{
"id": "9",
"name": "Ngumba"
}
]
}
]';
This is the desired output这是所需的输出
[
{
"id": "1",
"name": "CBD - Ngumba via Thika Road",
"stop": [
{
"id": "1",
"name": "City Centre (Pangani)"
},
{
"id": "2",
"name": "Muthaiga"
},
{
"id": "3",
"name": "Utalii"
},
{
"id": "4",
"name": "KCA"
},
{
"id": "5",
"name": "Drive Inn"
},
{
"id": "6",
"name": "Allsops"
},
{
"id": "7",
"name": "GSU"
},
{
"id": "8",
"name": "Roasters"
},
{
"id": "9",
"name": "Ngumba"
}
]
},
{
"id": "2",
"name": "Ngumba - City Centre via Thika Road",
"stop": [
{
"id": "1",
"name": "City Centre (Pangani)"
},
{
"id": "2",
"name": "Muthaiga"
},
{
"id": "3",
"name": "Utalii"
},
{
"id": "4",
"name": "KCA"
},
{
"id": "5",
"name": "Drive Inn"
},
{
"id": "6",
"name": "Allsops"
},
{
"id": "7",
"name": "GSU"
},
{
"id": "8",
"name": "Roasters"
},
{
"id": "9",
"name": "Ngumba"
}
]
}
]
Here is what I have tried but still returns the data as is in the original string.这是我尝试过的，但仍然返回原始字符串中的数据。
$routes = json_decode($routes);
echo json_encode(array_merge_recursive($routes));
1 个解决方案
解决方案1
0 已采纳 2020-11-01 06:41:50
It's not working because that's not how the function works.它不起作用，因为这不是该功能的工作方式。 You need to write a custom function to achieve desired result.您需要编写一个自定义函数来实现所需的结果。
function merge_result($data)
{
$result = [];
$index = 0;
$keys = [];
foreach($data as $row)
{
if(array_key_exists($row['id'], $keys)){
$_index = $keys[$row['id']];
$result[$_index]['stop'] = array_merge($result[$_index]['stop'], $row['stop']);
}else {
$keys[$row['id']] = $index;
$result[$index] = $row;
$index++;
}
}
return $result;
}
$routes = merge_result(json_decode($data, true));
PS: Am unable to test because am on mobile phone. PS：我无法测试，因为我在手机上。
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