Naming Keys in a Multidimensional Array in PHP - php

Question

I have data from a csv file that I organized into a multidimensional array using the following method:
$handle = fopen("bankdata.csv", "r");
while(($data = fgetcsv($handle, 0 ,",")) !==FALSE) {
$transactions[] = $data;
}
The array now looks something like this:
Array
(
[0] => Array
(
[0] => 2000
[1] => paycheck
[2] => credit
)
[1] => Array
(
[0] => 75
[1] => grocery
[2] => debit
)
[2] => Array
(
[0] => 45
[1] => gas
[2] => debit
)
[3] => Array
(
[0] => 900
[1] => investments
[2] => credit
)
[4] => Array
(
[0] => 1500
[1] => bonus
[2] => credit
)
Now I would like to name the keys in each nested array. I thought I would create a new multidimensional array with an equal amount of nested arrays, their values being the intended name of the keys I would like to add to the original array, then do 'array_combine':
$names = array('amount','source','type');
$run = 1;
while($run < 6){
$run = $run +1;
$names2[] = $names;
}
$combine = array_combine($names2, $transactions);

Answer 1

You could use array combine:
$keynames=array('amount','source','type');
foreach ($transactions as $i=>$row) {
$transactions[$i]=>array_combine($keynames, $row);
}
The right way to solve the problem is not to read the the data into an array then transform it - transform it as you read it.
while(($data = fgetcsv($handle, 0 ,",")) !==FALSE) {
$transactions[]=array_combine($keynames, $data);
}
BTW PHP doesn't do multi-dimensional arrays - they're nested. Despite what it says in the manual, they only emulate multi-dimensional arrays.

Answer 2

Try the following:
$arr = array(
array(2000, 'paycheck', 'credit'),
array(75, 'grocery', 'debit'),
array(45, 'gas', 'debit'),
array(900, 'investments', 'credit'),
array(1500, 'bonus', 'credit')
);
$keys = array('amount','source','type');
// $a will make a reference to the array within $arr
// and override the array
foreach($arr as &$a)
{
// Override the array keys
$a = array_combine($keys, $a);
}
/* Output:
Array
(
[0] => Array
(
[amount] => 2000
[source] => paycheck
[type] => credit
)
[1] => Array
(
[amount] => 75
[source] => grocery
[type] => debit
)
[2] => Array
(
[amount] => 45
[source] => gas
[type] => debit
)
[3] => Array
(
[amount] => 900
[source] => investments
[type] => credit
)
[4] => Array
(
[amount] => 1500
[source] => bonus
[type] => credit
)
)
*/