Merge and rearrange nested key/values - php

Question

I have an array like this:
array(
0 => array(
'name' => 'colors',
'options' => array(
array('name'=>'red', 'price'=>'2'),
array('name'=>'blue', 'price'=>'3')
)
),
1 => array(
'name' => 'sizes',
'options' => array(
array('name'=>'small', 'price'=>'5'),
array('name'=>'large', 'price'=>'10')
)
),
);
I want to merge all of the nested options arrays' name/prices into one, so it'll be like this:
array(
'red' => '2',
'blue' => '3',
'small' => '5',
'large' => '10'
);
I have a feeling this is very simple, but anything I try seems too convoluted. Any help would be appreciated.
...and yes, I just posted almost the same question not too long ago. This is a bit different, and what I meant to ask in the first place - oops, sorry.

Answer 1

I'm not sure if this can be done with internal methods such as array_merge(), array_combine(), etc since your structure seems quite special. But how about iterating over the array and building a new one yourself?
function customRearrange($arr) {
$result = array();
foreach ($arr as $group) {
foreach ($group['options'] as $option) {
// prevents values from being overwritten, uncomment if unwanted
if (!array_key_exists($option['name'], $result))
$result[ $option['name'] ] = $option['price'];
}
}
return $result;
}

Answer 2

You need to decide how you will handle collisions, anyway here is same which will give you right direction:
$newArray = array();
foreach ($array as $i => $item)
foreach ($item['options'] as $j => $option)
$newArray[$option['name']] = $option['price'];

Answer 3

Here's another way, assuming the array has been assigned to the variable $a:
<?php
for ($i = 0; $i < count($a); $i++) {
$key = $a[$i]['name'];
$options = $a[$i]['options'];
for ($j = 0; $j < count($options); $j++) {
$optkey = $options[$j]['name'];
$prices[$optkey] = $options[$j]['price'];
}
}
print_r($prices);

Answer 4

Iterate through "options" in the nested array and create a new array :
<?php
$arr = array(
0 => array(
'name' => 'colors',
'options' => array(
array('name'=>'red', 'price'=>'2'),
array('name'=>'blue', 'price'=>'3')
)
),
1 => array(
'name' => 'sizes',
'options' => array(
array('name'=>'small', 'price'=>'5'),
array('name'=>'large', 'price'=>'10')
)
),
);
$group = array();
foreach($arr as $a){
foreach($a['options'] as $op){
$group[$op['name']] = $op['price'];
}
}
print_r($group);
?>