I am getting below json array as and i want to remove the child node "n":[] - when it is empty. (PHP)
INPUT:
[
{
"level": 1,
"id": "101",
"n": [
{
"level": 2,
"id": "102",
"n": [
]
}
]
},
{
"level": 1,
"id": "103",
"n": [
{
"level": 2,
"id": "104",
"n": [
]
},
{
"level": 2,
"id": "105",
"n": [
{
"level": 3,
"id": "106",
"n": [
]
},
{
"level": 3,
"id": "107",
"n": [
{
"level": 4,
"id": "108",
"n": [
{
"level": 5,
"id": "109",
"n": [
]
}
]
}
]
}
]
}
]
},
{
"level": 1,
"id": "110",
"n": [
{
"level": 2,
"id": "111",
"n": [
{
"level": 3,
"id": "112",
"n": [
]
}
]
},
{
"level": 2,
"id": "113",
"n": [
{
"level": 3,
"id": "114",
"n": [
{
"level": 4,
"id": "115",
"n": [
]
}
]
},
{
"level": 3,
"id": "116",
"n": [
{
"level": 4,
"id": "117",
"n": [
]
},
{
"level": 4,
"id": "118",
"n": [
{
"level": 5,
"id": "119",
"n": [
]
},
{
"level": 5,
"id": "120",
"n": [
]
}
]
}
]
}
]
}
]
}
]
OUTPUT:
[
{
"level": 1,
"id": "101",
"n": [
{
"level": 2,
"id": "102"
}
]
},
{
"level": 1,
"id": "103",
"n": [
{
"level": 2,
"id": "104"
},
{
"level": 2,
"id": "105",
"n": [
{
"level": 3,
"id": "106"
},
{
"level": 3,
"id": "107",
"n": [
{
"level": 4,
"id": "108",
"n": [
{
"level": 5,
"id": "109"
}
]
}
]
}
]
}
]
},
{
"level": 1,
"id": "110",
"n": [
{
"level": 2,
"id": "111",
"n": [
{
"level": 3,
"id": "112"
}
]
},
{
"level": 2,
"id": "113",
"n": [
{
"level": 3,
"id": "114",
"n": [
{
"level": 4,
"id": "115"
}
]
},
{
"level": 3,
"id": "116",
"n": [
{
"level": 4,
"id": "117"
},
{
"level": 4,
"id": "118",
"n": [
{
"level": 5,
"id": "119"
},
{
"level": 5,
"id": "120"
}
]
}
]
}
]
}
]
}
]
All the ,"n":[] removed from the json array. Please help me with some PHP code to get the output from that above input.
Use the recursion, to recursively find the property n which has the value [] and delete them:
function removeEmptyNode(nodes) {
if(!nodes || nodes.length === 0)
return;
nodes.forEach(function(node) {
if(node.n.length === 0) {
delete node.n;
} else {
removeEmptyNode(node.n);
}
});
}
var data = [{
"level": 1,
"id": "101",
"n": [{
"level": 2,
"id": "102",
"n": []
}]
}, {
"level": 1,
"id": "103",
"n": [{
"level": 2,
"id": "104",
"n": []
}, {
"level": 2,
"id": "105",
"n": [{
"level": 3,
"id": "106",
"n": []
}, {
"level": 3,
"id": "107",
"n": [{
"level": 4,
"id": "108",
"n": [{
"level": 5,
"id": "109",
"n": []
}]
}]
}]
}]
}, {
"level": 1,
"id": "110",
"n": [{
"level": 2,
"id": "111",
"n": [{
"level": 3,
"id": "112",
"n": []
}]
}, {
"level": 2,
"id": "113",
"n": [{
"level": 3,
"id": "114",
"n": [{
"level": 4,
"id": "115",
"n": []
}]
}, {
"level": 3,
"id": "116",
"n": [{
"level": 4,
"id": "117",
"n": []
}, {
"level": 4,
"id": "118",
"n": [{
"level": 5,
"id": "119",
"n": []
}, {
"level": 5,
"id": "120",
"n": []
}]
}]
}]
}]
}];
removeEmptyNode(data);
console.log(data);EDIT:
If you want to do this in PHP, you can convert the above code easily to PHP.
Assuming you have source object in JSON string, you could be able to use this code:
<?php
function removeEmptyNodes(&$nodes) {
if(empty($nodes)) {
return;
}
foreach($nodes as &$node) {
if(empty($node['n'])) {
unset($node['n']);
} else {
removeEmptyNodes($node['n']);
}
}
}
$json = '[{"level":1,"id":"101","n":[{"level":2,"id":"102","n":[]}]},{"level":1,"id":"103","n":[{"level":2,"id":"104","n":[]},{"level":2,"id":"105","n":[{"level":3,"id":"106","n":[]},{"level":3,"id":"107","n":[{"level":4,"id":"108","n":[{"level":5,"id":"109","n":[]}]}]}]}]},{"level":1,"id":"110","n":[{"level":2,"id":"111","n":[{"level":3,"id":"112","n":[]}]},{"level":2,"id":"113","n":[{"level":3,"id":"114","n":[{"level":4,"id":"115","n":[]}]},{"level":3,"id":"116","n":[{"level":4,"id":"117","n":[]},{"level":4,"id":"118","n":[{"level":5,"id":"119","n":[]},{"level":5,"id":"120","n":[]}]}]}]}]}]';
$data = json_decode($json, true);
removeEmptyNodes($data);
print_r(json_encode($data));
?>
</div>