Create parent child relation JSON tree - php

Question

This is my code I have three table posts table, comments table, and likes table. I have a left joined all three tables with postid common in all three tables. I'm getting all data perfectly but I'm getting repeating data of postdata (ex: Postid=1) I don't want that. My problem is getting repeating data of Postdata (ex: Postid=1) I want to make a parent of Postdata where postsdata=1 and I want to insert all data into parent
<?php
include "../dcon.php";
$sql = "select * FROM posts left join comments on comments.Cpostid=posts.PostId left join likes on likes.postid=posts.PostId";
$query=mysqli_query($mysqli,$sql);
$result = mysqli_num_rows($query);
$menus=array();
for($i=0; $i<$result; $i++){
$row = mysqli_fetch_all($query,MYSQLI_ASSOC);
foreach($row as $index => $row ){
$menus[]=[
'PostId'=>$row['PostId'],
'PostVideo'=>$row['PostVideo'],
'PostDesc'=>$row['PostDesc'],
'PostImage'=>$row['PostImage'],
'PostedBy'=>$row['PostedBy'],
'UserName'=>$row['UserName'],
'Status'=>$row['Status'],
'PostParent'=>$row['PostParent'],
'likes'=>$row['likes'],
'comments'=>[
$index => [
'commentsid'=>$row['commentsId'],
'comments'=>$row['comments'],
'Cpostid'=>$row['Cpostid'],
'time'=>$row['time'],
],],
'likes'=>[
$index =>[
'Likeid'=>$row['Lid'],
'dislikes'=>$row['dislikes'],
'postid'=>$row['postid'],
'userid'=>$row['userid'],
]]
];
}
}
echo json_encode($menus,JSON_PRETTY_PRINT);
?>
My output was below:
[
{
"PostId": "1",
"PostVideo": "v2.mp4",
"PostDesc": "this is a tutorial on bench press",
"PostImage": "null",
"PostedBy": "Irfan khan",
"UserName": "irfan",
"Status": "1",
"PostParent": null,
"likes": {
"Likeid": "1",
"dislikes": "0",
"postid": "1",
"userid": "1"
},
"comments": {
"commentsid": "1",
"comments": "awesome video",
"Cpostid": "1",
"time": "2020-12-16 17:33:33"
}
},
{
"PostId": "1",
"PostVideo": "v2.mp4",
"PostDesc": "this is a tutorial on bench press",
"PostImage": "null",
"PostedBy": "Irfan khan",
"UserName": "khan",
"Status": "1",
"PostParent": null,
"likes": {
"Likeid": "1",
"dislikes": "0",
"postid": "1",
"userid": "1"
},
"comments": {
"commentsid": "2",
"comments": "good workouts",
"Cpostid": "1",
"time": "2020-12-16 17:33:33"
}
},
{
"PostId": "1",
"PostVideo": "v1.mp4",
"PostDesc": "Chicken generally includes low fat in the meat itself (castrated roosters excluded). The fat is highly concentrated on the skin. A 100g serving of baked chicken breast contains 4 grams of fat and 31 grams of protein, compared to 10 grams of fat and 27 grams of protein for the same portion of broiled, lean skirt steak.",
"PostImage": "im1",
"PostedBy": "Rehmat",
"UserName": null,
"Status": "1",
"PostParent": null,
"likes": {
"Likeid": "20",
"dislikes": "0",
"postid": "1",
"userid": "4"
},
"comments": {
"commentsid": null,
"comments": null,
"Cpostid": null,
"time": null
}
},
{
"PostId": "1",
"PostVideo": "v1.mp4",
"PostDesc": "Chicken generally includes low fat in the meat itself (castrated roosters excluded). The fat is highly concentrated on the skin. A 100g serving of baked chicken breast contains 4 grams of fat and 31 grams of protein, compared to 10 grams of fat and 27 grams of protein for the same portion of broiled, lean skirt steak.",
"PostImage": "im1",
"PostedBy": "Rehmat",
"UserName": null,
"Status": "1",
"PostParent": null,
"likes": {
"Likeid": "26",
"dislikes": "0",
"postid": "1",
"userid": "4"
},
"comments": {
"commentsid": null,
"comments": null,
"Cpostid": null,
"time": null
}
},
{
"PostId": "3",
"PostVideo": null,
"PostDesc": "this is an image of chicken",
"PostImage": "post.jpg",
"PostedBy": "khan",
"UserName": null,
"Status": "0",
"PostParent": null,
"likes": {
"Likeid": null,
"dislikes": null,
"postid": null,
"userid": null
},
"comments": {
"commentsid": null,
"comments": null,
"Cpostid": null,
"time": null
}
},
{
"PostId": "9",
"PostVideo": null,
"PostDesc": "gdhgh",
"PostImage": "ghghdf",
"PostedBy": null,
"UserName": null,
"Status": null,
"PostParent": null,
"likes": {
"Likeid": null,
"dislikes": null,
"postid": null,
"userid": null
},
"comments": {
"commentsid": null,
"comments": null,
"Cpostid": null,
"time": null
}
}
];
I want my output like below:
{
"PostId": "1",
"PostVideo": "v2.mp4",
"PostDesc": "this is a tutorial on bench press",
"PostImage": "null",
"PostedBy": "Irfan khan",
"UserName": "irfan",
"Status": "1",
"PostParent": null,
"likes":
'0':{
"Likeid": "1",
"dislikes": "0",
"postid": "1",
"userid": "1"
},
'1':{
"Likeid": "1",
"dislikes": "0",
"postid": "1",
"userid": "1"
},
'2':{
"Likeid": "1",
"dislikes": "0",
"postid": "1",
"userid": "1"
},
'3':{
"Likeid": "1",
"dislikes": "0",
"postid": "1",
"userid": "1"
},
"comments":
'0':{
"commentsid": "1",
"comments": "awesome video",
"Cpostid": "1",
"time": "2020-12-16 17:33:33"
},
'1':{
"commentsid": "1",
"comments": "awesome video",
"Cpostid": "1",
"time": "2020-12-16 17:33:33"
},
'2':{
"commentsid": "1",
"comments": "awesome video",
"Cpostid": "1",
"time": "2020-12-16 17:33:33"
},
'3':{
"commentsid": "1",
"comments": "awesome video",
"Cpostid": "1",
"time": "2020-12-16 17:33:33"
}
},
{
"PostId": "9",
"PostVideo": null,
"PostDesc": "gdhgh",
"PostImage": "ghghdf",
"PostedBy": null,
"UserName": null,
"Status": null,
"PostParent": null,
"likes": {
"Likeid": null,
"dislikes": null,
"postid": null,
"userid": null
},
"comments": {
"commentsid": null,
"comments": null,
"Cpostid": null,
"time": null
}
}

Answer 1

Hmm... At first I thought that your loops were the problem, and you misunderstood the behavior. But then I saw your "i want my output like below", and that didn't made sense, specifically you wanting duplicate likes/comments.
First, the loops: a for loop and an inner foreach loop. The for loop iterates over the number of results. The inner foreach loop iterates over all the results. So if we have 6 results, instead of only iterating 6 times, we iterate 36 times (6 result count x 6 results).
We actually need only 1 loop:
$query = mysqli_query($mysqli, $sql);
$menus = [];
$rows = mysqli_fetch_all($query, MYSQLI_ASSOC);
foreach ($rows as $index => $row) {
$menus[] = [
...
];
}
Next, we avoid duplicate posts by indexing the $menus with PostId. If the PostId does not yet exist in $menus, we insert the post; otherwise we just append the like/comment:
$query = mysqli_query($mysqli, $sql);
$menus = [];
$rows = mysqli_fetch_all($query, MYSQLI_ASSOC);
foreach ($rows as $row) {
if (!isset($menus[$row['PostId']])) {
$menus[$row['PostId']] = [
'PostId' => $row['PostId'],
...
'comments' => [],
'likes' => [],
];
}
$menus[$row['PostId']]['comments'][] = [
...
];
$menus[$row['PostId']]['likes'][] = [
...
];
}
If for some reason you don't want the $menus indexed by PostId, we can just call array_values() after the loop to re-index it with zero-based sequential integer:
foreach (...) { ... }
$menus = array_values($menus);
As for the duplicate likes/comments, you were explicit about it. But just in case you actually want non-duplicate, we can also index them by their Likeid and commentsid, and insert/ignore as necessary:
$query = mysqli_query($mysqli, $sql);
$menus = [];
$rows = mysqli_fetch_all($query, MYSQLI_ASSOC);
foreach ($rows as $row) {
if (!isset($menus[$row['PostId']])) {
$menus[$row['PostId']] = [
'PostId' => $row['PostId'],
...
'comments' => [],
'likes' => [],
];
}
if (!isset($menus[$row['PostId']]['comments'][$row['commentsid']])) {
$menus[$row['PostId']]['comments'][$row['commentsid']] = [
...
];
}
if (!isset($menus[$row['PostId']]['Likes'][$row['Lid']])) {
$menus[$row['PostId']]['Likes'][$row['Lid']] = [
...
];
}
}
And if we also don't want the comments/likes indexed by commentsid/Lid, we can call array_values() on them as well:
foreach (...) { ... }
$menus = array_values($menus);
foreach ($menus as &$menu) {
$menu['comments'] = array_values($menu['comments']);
$menu['likes'] = array_values($menu['likes']);
}
unset($menu);
// Or
array_walk($menus, function (&$menu) {
$menu['comments'] = array_values($menu['comments']);
$menu['likes'] = array_values($menu['likes']);
});