merging subarrays of multidimensional arrays while sorting array alphabetically - php

Question

Trying to alphabetically merge arrays with foreach loop.
<?php
$fruits = array(
'Apple' => array('ids'=>array(1,2)),
'Banana' => array('ids'=>array(3,4)),
'Ananas' => array('ids'=>array(5,6))
);
$result = array();
foreach ($fruits as $name=>$subarr) {
$first_letter = mb_substr($name, 0, 1);
$result[$first_letter] = $subarr;
}
print_r($result);
gives me smth like
Array
(
[A] => Array
(
[ids] => Array
(
[0] => 5
[1] => 6
)
)
[B] => Array
(
[ids] => Array
(
[0] => 3
[1] => 4
)
)
)
instead of smth like
[A] => Array
(
[ids] => Array
(
[0] => 1
[1] => 2
[2] => 5
[3] => 6
)
)
how can I fix it?

Answer 1

You overwrite your result every iteration in this line:
$result[$first_letter] = $subarr;
Just create a new array if the subArray in the result array doesn't exists and merge the ids subArray into your result array.
foreach ($fruits as $name=>$subarr) {
$first_letter = mb_substr($name, 0, 1);
if(!isset($result[$first_letter]))
$result[$first_letter] = [];
$result[$first_letter] = array_merge($result[$first_letter], $subarr["ids"]);
}

Answer 2

Please try to use foreach loop.
$fruits = array(
'Apple' => array('ids'=>array(1,2)),
'Banana' => array('ids'=>array(3,4)),
'Ananas' => array('ids'=>array(5,6))
);
$result = array();
foreach ($fruits as $name=>$subarr) {
$first_letter = mb_substr($name, 0, 1);
foreach($subarr as $key=>$value){
foreach ($value as $gkey => $gvalue) {
$result[$first_letter]['ids'][] = $gvalue;
}
}
}
echo "<pre>";
print_r($result);
Display above code output like below.
Array
(
[A] => Array
(
[ids] => Array
(
[0] => 1
[1] => 2
[2] => 5
[3] => 6
)
)
[B] => Array
(
[ids] => Array
(
[0] => 3
[1] => 4
)
)
)