How to convert array to multidimensional array with special keys using php? - php

Question

I have an array
$array = [
0=>1
1=>Jon
2=>jon#email.com
3=>2
4=>Doe
5=>doe#email.com
6=>3
7=>Foo
8=>foo#email.com
]
What I`d like to do is to add and extra value to each value.
Something like this so I can access it when looping through the array
$array=[
0=>1[id]
1=>Jon[name]
2=>jon#email.com[email]
3=>2[id]
4=>Doe[name]
5=>doe#email.com[email]
6=>3[id]
7=>Foo[name]
8=>foo#email.com[email]
]
I guess it would be a multidimensional array?
What would be the proper way of doing it?

Answer 1

Loop through array and check key of items and based of it create new array and insert values in it.
$newArr = [];
foreach($array as $key=>$value){
if ($key % 3 == 0)
$newArr[] = ["id" => $value];
if ($key % 3 == 1)
$newArr[sizeof($newArr)-1]["name"] = $value;
if ($key % 3 == 2)
$newArr[sizeof($newArr)-1]["email"] = $value;
}
Check result in demo

Answer 2

yes just use 2 dimension array
$arr = array();
$arr[0][0] = "1"
$arr[0][1] = "Jon"
$arr[0][2] = "jon#email.com"
$arr[1][0] = "2"
$arr[1][1] = "Doe"
$arr[1][2] = "doe#email.com"

Answer 3

Since an array is a map in PHP, I'd recommend to use it like a map or to create a class holding the data.
$arr = array();
$arr[0]['ID'] = 1;
$arr[0]['name'] = "John";
$arr[0]['mail'] = "john#email.com;
Example for one class:
<?PHP
class User
{
public $id;
public $name;
public $mail;
function __construct($ID,$name,$mail)
{
$this->id = $ID;
$this->name = $name;
$this->mail = $mail;
}
}
?>
and then you can simply use it like that:
<?PHP
require_once("User.php");
$user = new User(1,"Mario","maio290#foo.bar");
echo $user->name;
?>

Answer 4

A simple, yet often-used solution is to use multidimensional array with string keys for better readability:
$array = [
0 => [
'id' => 1,
'name' => 'Jon',
'email' => 'jon#email.com',
],
1 => [
'id' => 2,
'name' => 'Doe',
'email' => 'doe#email.com',
],
2 => [
'id' => 3,
'name' => 'Foo',
'email' => 'foo#email.com',
],
];
You can loop through this like so:
for ($array as $item) {
// $item['id']
// $item['name']
// $item['email']
}
But since PHP is an object-oriented language, I'd suggest creating a class for the data-structure. This is even easier to read and you can very easily add functionality related to the entity etc.
class Person {
public $id;
public $name;
public $email;
function __construct($id, $name, $email) {
$this->id = $id;
$this->name = $name;
$this->email = $email;
}
}
$array = [
0 => new Person(1, 'Jon', 'jon#email.com'),
1 => new Person(2, 'Doe', 'doe#email.com'),
2 => new Person(3, 'Foo', 'foo#email.com'),
];
You can loop through this like so:
for ($array as $person) {
// $person->id
// $person->name
// $person->email
}

Answer 5

Use array_map on the result of array_chunck this way:
$array=array_map(function($val){ return array_combine(['id','name','email'],$val);}, array_chunk($array,3));
note that the second parameter of array_chunk depend of the number of columns and the first array used in array_combine too
see the working code here

Answer 6

You can also do like this:
$array1 = ["name"=>"alaex","class"=>4];
$array2 = ["name"=>"aley","class"=>10];
$array3 = ["student"=>$array1,"student2"=>$array2];
print_r($array3);