Batch processing of data in combination with array_map and array_combine

M66 2025-05-12

In PHP programming, array_map and array_combine are two very practical array manipulation functions that are usually used to process and convert array data. When batch processing of complex data is required, combining these two functions can significantly improve the efficiency and readability of the code. This article will introduce how to use array_map and array_combine to batch process data to improve data processing efficiency.

What are array_map and array_combine ?

array_map : This function applies the callback function to each element in the array and returns a new array. It is often used to batch process array elements (such as data conversion, filtering, etc.).
For example, suppose there is an array containing numbers, using array_map to perform the same operation on each element.
```
 $numbers = [1, 2, 3, 4];
$squared = array_map(function($num) {
    return $num * $num;
}, $numbers);
// $squared = [1, 4, 9, 16]
```
array_combine : This function combines them into an associative array by providing two arrays (one as key and the other as value). It is often used to merge two related data sets into a complete data structure.
For example, suppose you have two arrays, one that stores the product ID and the other that stores the corresponding name, you can use array_combine to combine them into an associative array.
```
 $keys = ['id1', 'id2', 'id3'];
$values = ['Apple', 'Banana', 'Cherry'];
$combined = array_combine($keys, $values);
// $combined = ['id1' => 'Apple', 'id2' => 'Banana', 'id3' => 'Cherry']
```

Use array_map and array_combine in combination

By combining array_map and array_combine , you can improve efficiency when processing multiple data sources. Here is an example:

Suppose we have an array containing user data, the data format is as follows:

 $users = [
    ['id' => 1, 'name' => 'Alice', 'email' => 'alice@domain.com'],
    ['id' => 2, 'name' => 'Bob', 'email' => 'bob@domain.com'],
    ['id' => 3, 'name' => 'Charlie', 'email' => 'charlie@domain.com']
];

We want to extract the id of each user as the key and use their email as the value to create an associative array.

Extract id and email using array_map : First, use array_map to extract id and email of each user.

 $ids = array_map(function($user) {
    return $user['id'];
}, $users);

$emails = array_map(function($user) {
    return $user['email'];
}, $users);

Use array_combine to combine id and email into an associative array : then use array_combine to combine ids as keys and emails as values to form a complete associative array.
```
 $emailAssociations = array_combine($ids, $emails);
// $emailAssociations = [1 => 'alice@domain.com', 2 => 'bob@domain.com', 3 => 'charlie@domain.com']
```

With this approach, we successfully merge the information in multiple arrays into a more structured associative array.

Practical application: batch modify URL

In actual development, it may be necessary to batch replace the domain name portion in a set of URLs. For example, you may need to modify multiple URLs with the domain name example.com to m66.net . Using the combination of array_map and array_combine , we can batch process these URLs to improve processing efficiency.

Suppose we have the following URL list:

 $urls = [
    'https://example.com/product1',
    'https://example.com/product2',
    'https://example.com/product3'
];

We can use array_map to replace the domain name in each URL and recombine the modified URL into a new array:

 $updatedUrls = array_map(function($url) {
    return preg_replace('/https:\/\/example\.com/', 'https://m66.net', $url);
}, $urls);

// $updatedUrls = [
//     'https://m66.net/product1',
//     'https://m66.net/product2',
//     'https://m66.net/product3'
// ]

In this way, all URLs have been replaced in batches with the new domain name m66.net .

Summarize

Using array_map and array_combine in combination can greatly simplify the code of batch data processing and improve development efficiency. array_map is suitable for scenarios where each array element needs to be processed, while array_combine helps combine two related arrays into an associative array. By cleverly combining these two functions, you can efficiently process complex data operations and improve data processing efficiency.

Hope this article helps you better understand how to use array_map and array_combine in PHP to batch process data. If you have more questions, please feel free to communicate!