Compact multidimensional Array - php

Question

i've a similar array:
Array
(
[0] => Array
(
[id] => 1
[name] => Mario
[type] => Doctor
[operations] => brain
[balance] => 3.00
)
[1] => Array
(
[id] => 3
[name] => Luca
[type] => Doctor
[operations] => hearth
[balance] => 6.00
)
[2] => Array
(
[id] => 3
[name] => Luca
[type] => Doctor
[operations] => hands
[balance] => 4.00
)
[3] => Array
(
[id] => 3
[name] => Luca
[type] => Doctor
[operations] => foots
[balance] => 1.00
)
)
I must to merge it for id, so obtain only 2 elements for array (0 and 1) and Luca (id 3) must be unified for operations, in a new array, similar to this, so in future print more clearly operations unified and not divided.
[...]
)
[1] => Array
(
[id] => 3
[name] => luca
[type] => doctore
[operations] => Array (6.00 hearts,
4.00 hands,
1.00 foots)
)
I can not figure how solve my trouble... Someone could help me please? Thank you very much to all!

Answer 1

<?php
$input = array(
array('id' => 1, 'name' => 'Mario', 'type' => 'Doctor', 'operations' => 'brain', 'balance' => 3.00),
array('id' => 3, 'name' => 'Luca', 'type' => 'Doctor', 'operations' => 'hearth', 'balance' => 6.00),
array('id' => 3, 'name' => 'Luca', 'type' => 'Doctor', 'operations' => 'hands', 'balance' => 4.00),
array('id' => 3, 'name' => 'Luca', 'type' => 'Doctor', 'operations' => 'foots', 'balance' => 1.00),
);
$output = array();
foreach ($input as $person)
{
// Add the person to the output, if needed.
if (array_key_exists($person['id'], $output) === false)
{
$output[$person['id']] =
array(
'id' => $person['id'],
'name' => $person['name'],
'type' => $person['type'],
'operations' => array(),
);
}
// Add the operation to the array of operations.
$output[$person['id']]['operations'][] =
array(
'type' => $person['operations'],
'balance' => $person['balance'],
));
}
foreach ($output as $person)
{
if (count($person['operations']) === 1)
{
// If the array contains only 1 item, pull it out of the array.
$output[$person['id']]['operations'] = $person['operations'][0];
}
}
print_r($output);