PHP: Translation table to convert mutiple values to another value? - php

Question

I have a a number of values/IDs that need to be translated to a single ID, what is the recommended method using PHP?
For example, I want IDs 38332, 84371, 37939, 1275 to all translate to ID 1234 and IDs222, 47391, 798 to all translate to ID 1235, etc. .
I'm thinking PHP has something built-in to handle this efficiently?

Answer 1

I'm thinking PHP has something built-in to handle this efficiently?
You can use the standard array as a map, quickly translating one ID to another:
$table[38332]; # int(1234)
depending on how you store your overall translation table, you can create a function that returns the translation from its input:
$table = $translation('I want IDs 38332, 84371, 37939, 1275 to all translate to ID 1234');
$result = $table[1275] ?? null; # int(1234)
Example:
$parseId = static fn(string $i) => (int)trim($i);
$translation = static fn(string $buffer): array
=> preg_match_all('~((?:\d+,\s*)+\d+)\s+to all translate to ID\s*(\d+)~', $buffer, $_, PREG_SET_ORDER)
? array_reduce($_, static fn (array $carry, array $item): array => [
$ids = array_map($parseId, explode(',', $item[1])),
$carry += array_fill_keys($ids, $parseId($item[2])),
$carry,][2], []) : [];

Answer 2

This is pretty easy to accomplish with PHP, here's one way you could do it:
Using this method, you populate the $map array, using the id you want to replace with as the key, and the value being an array of the keys you want to be replaced. It then calculates a simple key => value array based on this to make comparison a lot quicker.
Instead of creating a copy of the data, you could use foreach ($data as &$record)
$data = [
[
'id' => 1,
'foreign_id' => 38332,
'text' => 'a'
],
[
'id' => 2,
'foreign_id' => 84371,
'text' => 'b'
],
[
'id' => 3,
'foreign_id' => 37939,
'text' => 'c'
],
[
'id' => 4,
'foreign_id' => 1275,
'text' => 'd'
],
[
'id' => 5,
'foreign_id' => 222,
'text' => 'e'
],
[
'id' => 5,
'foreign_id' => 47391,
'text' => 'f'
],
[
'id' => 5,
'foreign_id' => 798,
'text' => 'g'
]
];
$map = [
123 => [
38332,
84371,
37939,
1275
],
1235 => [
222,
47391,
798
]
];
// Calculate a map to speed things up later
$map_calc = [];
foreach ($map as $destination_id => $ids) {
foreach ($ids as $id) {
$map_calc[$id] = $destination_id;
}
}
$new_data = [];
foreach ($data as $record) {
if (isset($map_calc[$record['foreign_id']]))
$record['foreign_id'] = $map_calc[$record['foreign_id']];
$new_data[] = $record;
}
var_dump($new_data);