Modifying one dimenstional array into two dimensional array php - php

Question

I have a single-dimensional array $rec = ['123','456','789'] that I would like to modify into an array like:
array(
'id' => 0,
'addr' => 123,
),
array(
'id' => 0,
'addr' => 456,
),
array(
'id' => 0,
'addr' => 789,
),
To achieve that I have tried looping the original array and inserting each row into the new array like:
$rec = ['123','456','789']
$newList = [];
foreach($rec as $i => $r){
$row = array(
'id' => $i,
'addr' => $r,
);
$newList = array_combine($newList,$row);
}
return $newList;
This results in
{
"id": 2,
"addr": "789"
}
How do I go about to get what I want?

Answer 1

You cannot use array_combine for this purpose
$rec = ['123','456','789'];
$newList = [];
foreach($rec as $i => $r){
$newList[] = array(
'id' => 0,
'addr' => $r,
);
}
var_dump($newList) ;
var_dump Result will be
array(3) {
[0]=>
array(2) {
["id"]=>
int(0)
["addr"]=>
string(3) "123"
}
[1]=>
array(2) {
["id"]=>
int(0)
["addr"]=>
string(3) "456"
}
[2]=>
array(2) {
["id"]=>
int(0)
["addr"]=>
string(3) "789"
}
}
echo json_encode($newList) ;
[
{
"id": 0,
"addr": "123"
},
{
"id": 0,
"addr": "456"
},
{
"id": 0,
"addr": "789"
}
]

Answer 2

$rec = ['123','456','789'];
$newArray = [];
foreach($rec as $item) {
$newArray[] = [
'id' => 0, // or whatever number you want here
'addr' => $item,
];
}
var_dump($newArray);
Result:
//array (size=3)
// 0 =>
// array (size=2)
// 'id' => int 0
// 'addr' => string '123' (length=3)
// 1 =>
// array (size=2)
// 'id' => int 0
// 'addr' => string '456' (length=3)
// 2 =>
// array (size=2)
// 'id' => int 0
// 'addr' => string '789' (length=3)
This can also be done using a for loop(or any other sort of loop for that matter).
Using your original idea, we can also achive that:
$rec = ['123','456','789'];
$newList = [];
foreach($rec as $i => $r){
$row = array(
'id' => $i,
'addr' => $r,
);
$newList[] = array_combine(array_keys($row), array_values($row));
}
var_dump($newList);
Result:
array (size=3)
0 =>
array (size=2)
'id' => int 0
'addr' => string '123' (length=3)
1 =>
array (size=2)
'id' => int 1
'addr' => string '456' (length=3)
2 =>
array (size=2)
'id' => int 2
'addr' => string '789' (length=3)
Lets take a look at what array_combine does
/**
* Creates an array by using one array for keys and another for its values
* #link https://php.net/manual/en/function.array-combine.php
* #param array $keys <p>
* Array of keys to be used. Illegal values for key will be
* converted to string.
* </p>
* #param array $values <p>
* Array of values to be used
* </p>
* #return array|false the combined array, false if the number of elements
* for each array isn't equal or if the arrays are empty.
* #meta
*/
#[Pure]
function array_combine(array $keys, array $values) { }
So you would infact need to get array_keys and array_values from the $row array, also add the new array to the original using []. Which is very redundant.

Answer 3

try this
$rec = ['123','456','789'];
array_walk($rec, function($value,&$startNum ) use(&$result){
$result[]=['id'=>$startNum ++,'addr'=>$value];
},);
print_r($result);
Output
Array (
[0] => Array ( [id] => 0 [addr] => 123 )
[1] => Array ( [id] => 1 [addr] => 456 )
[2] => Array ( [id] => 2 [addr] => 789 ) )