Change index of an array - php

Question

I want to change the index of an array but I don't know how to do it..
The following array
array(
0 => array ( 'id' => 33, 'name' => 'test' )
1 => array ( 'id' => 37, 'name' => 'test2' )
)
should become - if i want the index
array(
33 => array ( 'id' => 33, 'name' => 'test' )
37 => array ( 'id' => 37, 'name' => 'test2' )
)
or if i want the name
array(
test => array ( 'id' => 33, 'name' => 'test' )
test2 => array ( 'id' => 37, 'name' => 'test2' )
)
also for a multi-dimensional array
array(
0 => array ( 'id' => 33, 'details' => array (name => 'test' , age ='50' ) )
1 => array ( 'id' => 37, 'details' => array (name => 'test2' , age ='60' ) )
)
to index replace 0 and 1 with the name - test or test2
right now I made a function but is not working with multi dimensional arrays
function index_array( $array, $index ){
$new_array = array();
foreach($array as $key => $value){
$new_array[$index] = $array[$key];
}
return $new_array;
}

Answer 1

$array = array(33 => $oldarray[0], 37 => $oldarray[1]);
$array = array('test' => $oldarray[0], 'test2' => $oldarray[1]);
Since the right-hand-side of the expression is evaluated before the assignment you could also use $array on both sides instead of a different variable name.

Answer 2

I'd do it with a mapping table for the first part, or a simple foreach for the second part:
<?php
$arr = array(
0 => array( 'id' => 33, 'name' => 'test' ),
1 => array( 'id' => 37, 'name' => 'test2' )
);
/* Convert to other indexes */
$mapping = array(
0 => 33,
1 => 37
);
foreach($arr as $k => $v){
unset($arr[$k]);
$arr[$mapping[$k]] = $v;
}
print_r($arr);
/* Convert key to name field */
foreach($arr as $k => $v){
unset($arr[$k]);
$arr[$v['name']] = $v;
}
print_r($arr);
EDIT: Now that I read your question again, the first part is actually the same as the second, but then just with the id field instead of the name field.
EDIT2: Note that you'd have to use another array to write to, to avoid overrides, which will occur when the id field is used as a replacement.