Which PHP Array function should I use? - php

Question

I have two arrays:
Array
(
[0] => Array
(
[id] => 1
[type] => field
[remote_name] => Title
[my_name] => title
[default_value] => http%3A%2F%2Ftest.com
)
[1] => Array
(
[id] => 2
[type] => field
[remote_name] => BookType
[my_name] => book-type
[default_value] =>
)
[2] => Array
(
[id] => 3
[type] => value
[remote_name] => dvd-disc
[my_name] => dvd
[default_value] =>
)
)
Array
(
[title] => Test
[book-type] => dvd
)
I need to take each key in the second array, match it with the my_name value in the first array and replace it with the corresponding remote_name value of the first array while preserving the value of the second array.
There's got to be some carrayzy function to help!
EDIT: There will also be a few cases that the value of the second array will need to be replaced by the value of the first array's remote_name where the value of the second array matches the value of the first array's my_name. How can I achieve this?
EG: book-type => dvd should turn into BookType => dvd-disc

Answer 1

Like so?:
$first = array(
array(
'id' => 1,
'type' => 'field',
'remote_name' => 'Title',
'my_name' => 'title',
'default_value' => 'http%3A%2F%2Ftest.com',
),
array(
'id' => 2,
'type' => 'field',
'remote_name' => 'BookType',
'my_name' => 'book-type',
'default_value' => '',
),
array(
'id' => 3,
'type' => 'value',
'remote_name' => 'dvd-disc',
'my_name' => 'dvd',
'default_value' => '',
),
);
$second = array(
'title' => 'Test',
'book-type' => 'dvd',
);
$map = array('fields' => array(), 'values' => array());
foreach ($first as $entry) {
switch ($entry['type']) {
case 'field':
$map['fields'][$entry['my_name']] = $entry['remote_name'];
break;
case 'value':
$map['values'][$entry['my_name']] = $entry['remote_name'];
break;
}
}
$new = array();
foreach ($second as $key => $val) {
$new[isset($map['fields'][$key]) ? $map['fields'][$key] : $key] = isset($map['values'][$val]) ? $map['values'][$val] : $val;
}
print_r($new);
Output:
Array
(
[Title] => Test
[BookType] => dvd-disc
)
Explanation:
The first loop collects the my_name/remote_name pairs for fields and values and makes them more accessible.
Like so:
Array
(
[fields] => Array
(
[title] => Title
[book-type] => BookType
)
[values] => Array
(
[dvd] => dvd-disc
)
)
The second loop will traverse $second and use the key/value pairs therein to populate $new. But while doing so will check for key/value duplicates in $map.
Keys or values not found in the map will be used as is.

Answer 2

foreach($arr1 as &$el) {
$el['remote_name'] = $arr2[$el['my_name']];
}
unset($el);

Answer 3

I am not aware of such a carrayzy function, but I know how you could do it:
//$array1 is first array, $array2 is second array
foreach($array1 as $key => $value){
if (isset($value['remote_name'], $value['my_name']) && $value['remote_name'] && $value['my_name']){
$my_name = $value['my_name'];
if (isset($array2[$my_name])) {
$remote_name = $value['remote_name'];
$array2[$remote_name] = $array2[$my_name];
//cleanup
unset($array2[$my_name]);
}
}
}