merge arrays with same value of key - php

Question

I use php glob function for get images in sub directories and I dont know how many files exist in each directory
directory name is id and I want to categorize all images in directories in one array
$arr = [];
$dir = dirname(__FILE__)."/gulets";
$files = glob($dir."/*/*_gulet_o_*");
foreach ($files as $file) {
$fullname = str_replace($dir."/", "", $file);
$name = explode("/", $fullname);
$name1 = array('id'=>$name[0],'name'=>$name[1]);
$arr[] = $name1;
}
header('Content-Type: application/json');
echo json_encode($arr);
[
{
"id": "10",
"name": "asdsad_gulet_o_1.jpg"
},
{
"id": "10",
"name": "wqes_gulet_o_10.jpg"
},
{
"id": "10",
"name": "qwsdf_gulet_o_11.jpg"
},
{
"id": "10",
"name": "sdce_gulet_o_12.jpg"
},
{
"id": "11",
"name": "fsdsc_gulet_o_13.jpg"
},
{
"id": "11",
"name": "drfvc_gulet_o_14.jpg"
},
{
"id": "12",
"name": "dsyjhk_gulet_o_15.jpg"
},
.
.
and I need change it like this :
[
{
"id": "10",
"name1": "asdsad_gulet_o_1.jpg",
"name2": "wqes_gulet_o_10.jpg",
"name3": "qwsdf_gulet_o_11.jpg"
"name4": "sdce_gulet_o_12.jpg"
},
{
"id": "11",
"name1": "fsdsc_gulet_o_13.jpg"
"name2": "drfvc_gulet_o_14.jpg"
},
{
"id": "12",
"name1": "dsyjhk_gulet_o_15.jpg"
.
.

Answer 1

you want something like this:
foreach ($arr as $a) {
$new_arr[$a['id']]['names'][] = $a['name'];
}

Answer 2

I think creating indexes like name1, name2, name3 etc is not useful. You should create subarray with index names and there put your names. Try code like this:
<?php
$array = array(
array('id'=>1, 'name'=>'qwerty'),
array('id'=>2, 'name'=>'asdf'),
array('id'=>2, 'name'=>'hjkl'),
array('id'=>1, 'name'=>'cvbnm'),
array('id'=>1, 'name'=>'yuiop'),
);
$groups = array();
foreach($array as $singleRow)
{
if(!isset($groups[$singleRow['id']]))
$groups[$singleRow['id']] = array('id'=>$singleRow['id'], 'names'=>array());
$groups[$singleRow['id']]['names'][] = $singleRow['name'];
}
$json = json_encode(array_values($groups));
var_dump($json);
It outputs:
[{"id":1,"names":["qwerty","cvbnm","yuiop"]},{"id":2,"names":["asdf","hjkl"]}]

Answer 3

instead of -
$name1 = array('id'=>$name[0],'name'=>$name[1]);
$arr[] = $name1;
you can use something like -
$nameKey = 'name' . $name[0];
$name1 = array('id'=>$name[0],$nameKey =>$name[1]);
if (!empty($arr[$name[0]])) {
$arr[$name[0]] = $arr[$name[0]] + $name1;
}
else {
$arr[$name[0]] = $name1;
}
and after end of foreach() loop do -
$arr = array_values($arr);