How to get particular nested array based on the given matched key? - php

Question

How to get particular nested array based on the given matched key using PHP built in function
Scenario
$id = 1035; // Searching ID
$a = [
'id'=> 291,
'children' => [
[
'id' => 1034,
'children' => [
[
'id' => 111,
'name' => 'ABC',
'figure' => '6 digits',
'children'=> []
],
[
'id' => 1035,
'lft' => 'LEFT',
'children' => [
[
'id' => 1036,
'children' => [
[
'id' => 222,
'someKey' => 'some value',
'children'=> []
]
]
],
[
'id' => 333,
'someKey' => 'some value',
'children'=> []
]
],
]
],
],
[
'id' => 1024,
'title' => 'ABC',
'children' => [
],
]
]
];
Please note, 'id' & 'children' keys are always be there. How to get the "children" of "1035" ID..?
Expected Output
[
[
'id' => 1036,
'children' => [
[
'id' => 222,
'someKey' => 'some value',
'children'=> []
]
],
],
[
'id' => 333,
'someKey' => 'some value',
'children'=> []
]
];
Tried
function getRecursiveCategoryIds($key, $categories = []){
$return = null;
try {
array_walk_recursive($categories, function($v, $k) use ($key, &$return){
if (null != $return) {
// Run loop to get the next immediate "children" key
if ($k == 'children') { // It's not matching anymore
$return = $v;
//return false;
throw new Exception;
}
} else if($v == $key) {
// Found
$return = $v;
}
});
} catch(Exception $e) {}
return $return;
}
$d = getRecursiveCategoryIds($id, $a);
echo '<pre>D: '; print_r($d); die;
I tried by the above code, but the "if ($k == 'children') {" is not matched any more..!
Any suggestions are welcome... (PHP's Built in function is most prefer!)

Answer 1

I was able to do this. Please check the comments in the code:
<?php
$id = 1035; // Searching ID
$myObj = array();
$a = [
'id'=> 291,
'children' => [
[
'id' => 1034,
'children' => [
[
'id' => 111,
'name' => 'ABC',
'figure' => '6 digits',
'children'=> []
],
[
'id' => 1035,
'lft' => 'LEFT',
'children' => [
[
'id' => 1036,
'children' => [
[
'id' => 222,
'someKey' => 'some value',
'children'=> []
]
]
],
[
'id' => 333,
'someKey' => 'some value',
'children'=> []
]
],
]
],
],
[
'id' => 1024,
'title' => 'ABC',
'children' => [
],
]
]
];
function findObject($id, $obj) {
global $myObj;
// This is an object.
if (isset($obj["id"])) {
echo "Checking {$obj["id"]}<br />";
// Check the id to what we need.
if ($obj["id"] == $id) {
// Yay! We found it. Return the object.
echo "Yay we found {$obj["id"]}<br />";
$myObj = $obj;
}
else {
echo "Checking children of {$obj["id"]}<br />";
// See if it has any children
if (isset($obj["children"]) && count($obj["children"]) > 0) {
echo "There are children for {$obj["id"]}<br />";
foreach ($obj["children"] as $child) {
findObject($id, $child);
}
}
}
}
}
findObject($id, $a);
print_r($myObj);
Output
Checking 291Checking children of 291There are children for 291Checking 1034Checking children of 1034There are children for 1034Checking 111Checking children of 111Checking 1035Yay we found 1035Need to find a way to break out!Checking 1024Checking children of 1024Found it!Array
(
[id] => 1035
[lft] => LEFT
[children] => Array
(
[0] => Array
(
[id] => 1036
[children] => Array
(
[0] => Array
(
[id] => 222
[someKey] => some value
[children] => Array
(
)
)
)
)
[1] => Array
(
[id] => 333
[someKey] => some value
[children] => Array
(
)
)
)
)
Demo:
https://ideone.com/UoKqrU
https://3v4l.org/rWkPq

Answer 2

You can use function inside other check :
$id=1035;
$a = [
'id'=> 291,
'children' => [
[
'id' => 1034,
'children' => [
[
'id' => 111,
'name' => 'ABC',
'figure' => '6 digits',
'children'=> []
],
[
'id' => 1035,
'lft' => 'LEFT',
'children' => [
[
'id' => 1036,
'children' => [
[
'id' => 222,
'someKey' => 'some value',
'children'=> []
]
]
],
[
'id' => 333,
'someKey' => 'some value',
'children'=> []
]
],
]
],
],
[
'id' => 1024,
'title' => 'ABC',
'children' => [
],
]
]
];
function nigsearch($arr,$id)
{
if(gettype($arr) == 'array')
foreach($arr as $key =>$list)
{
if(gettype($list) == 'array'){
if(isset($list['id']))
{
if($list['id'] ==$id)
print_r($list['children']);
}
nigsearch($list,$id);
}
}
}
foreach($a as $key)
{
nigsearch($key,$id);
}