How to get parent array element in PHP with recursive function - php

Question

I have PHP code as shown below which will print:
id:3deep:2path:image31.jpg
id:4deep:2path:image32.jpg
when I input deep = 2. However I would like to get parent array of this deep which is id = 2. Is there any way that I can do this?
Note:
Please see the result when I input deep as below:
> Deep = 1
ID = 0
ID = 1
ID = 2
ID = 7
ID = 8
> Deep = 2
ID = 2
ID = 3
ID = 4
> Deep = 3
ID = 4
ID = 5
ID = 6
Please check my code online.
PHP:
$obj = '{
"images": {
"deep": "1",
"id": "0",
"path": "image1.jpg",
"image": [
{
"deep": "1",
"id": "1",
"coordinate": "(x,y),(x,y)",
"path": "image2.jpg"
},
{
"deep": "1",
"id": "2",
"coordinate": "(x,y),(x,y)",
"path": "image3.jpg",
"image": [
{
"deep": "2",
"id": "3",
"coordinate": "(x,y),(x,y)",
"path": "image31.jpg"
},
{
"deep": "2",
"id": "4",
"coordinate": "(x,y),(x,y)",
"path": "image32.jpg",
"image": [
{
"deep": "3",
"id": "5",
"coordinate": "(x,y),(x,y)",
"path": "image321.jpg"
},
{
"deep": "3",
"id": "6",
"coordinate": "(x,y),(x,y)",
"path": "image322.jpg"
}
]
}
]
},
{
"deep": "1",
"id": "7",
"coordinate": "(x,y),(x,y)",
"path": "image4.jpg"
},
{
"deep": "1",
"id": "8",
"coordinate": "(x,y),(x,y)",
"path": "image5.jpg"
}
]
}
}';
$objArray = json_decode($obj,true);
$deep = 2;
$arr = all($objArray['images'], $deep);
display($arr);
function all($a, $d){
$temp = array();
if(is_array($a)){
foreach($a as $v){
all($v, $d);
}
if(isset($a['deep']) && $d == $a['deep']){
$temp['id'] = $a['id'];
$temp['deep'] = $a['deep'];
$temp['path'] = $a['path'];
$s =
'id:'.$a['id'].
'deep:'.$a['deep'].
'path:'.$a['path'];
display($s);
}
}
return ;
}
function display($a){
echo "<pre>";
print_r($a);
echo "</pre>";
}

Answer 1

Idk exactly what you want, but I changed your code a bit to filter in a nicer way and it adds the parent key to each $image so you can reference that afterwards.
You can set the $deep = null paramater to just add the parent to the image instead of filtering.
I hope you don't mind I changed the code style a bit, easier to read ( I hope :D )
Here's the code within phpfiddle: http://phpfiddle.org/main/code/8q0-c43
<?php
$obj = '{
"images": {
"deep": "1",
"id": "0",
"path": "image1.jpg",
"image": [
{
"deep": "1",
"id": "1",
"coordinate": "(x,y),(x,y)",
"path": "image2.jpg"
},
{
"deep": "1",
"id": "2",
"coordinate": "(x,y),(x,y)",
"path": "image3.jpg",
"image": [
{
"deep": "2",
"id": "3",
"coordinate": "(x,y),(x,y)",
"path": "image31.jpg"
},
{
"deep": "2",
"id": "4",
"coordinate": "(x,y),(x,y)",
"path": "image32.jpg",
"image": [
{
"deep": "3",
"id": "5",
"coordinate": "(x,y),(x,y)",
"path": "image321.jpg"
},
{
"deep": "3",
"id": "6",
"coordinate": "(x,y),(x,y)",
"path": "image322.jpg"
}
]
}
]
},
{
"deep": "1",
"id": "7",
"coordinate": "(x,y),(x,y)",
"path": "image4.jpg"
},
{
"deep": "1",
"id": "8",
"coordinate": "(x,y),(x,y)",
"path": "image5.jpg"
}
]
}
}';
$objArray = json_decode($obj, true);
function filter_deep(array $input, $deep = null, $parent = null) {
// store $results so we can return it
$result = array();
// loop over the $input
foreach ($input as $image) {
// set the parent passed alogn
$image['parent'] = $parent;
// add $image to $result if 'deep' == $deep
if ($deep === null || $image['deep'] == $deep) {
$result[] = $image;
}
// if the $image contains more child images recursively run this function again
// and merge the result with what we already have
if (isset($image['image']) && is_array($image['image'])) {
$result = array_merge($result, filter_deep($image['image'], $deep, $image));
}
}
return $result;
}
function display_image($image) {
return "id:{$image['id']} deep:{$image['deep']} path:{$image['path']} parent_id:{$image['parent']['id']} <br />\n";
}
// loop over the images that have deep == 2 and display them
foreach (filter_deep(array($objArray['images']), 2) as $image) {
echo display_image($image);
}
?>