How to handle data boundaries in PHP array pagination?

Efficient ways to handle data boundaries in PHP array paging include using the array_slice() function (extracts data by a specified length and offset) and the array_chunk() function (splits the array into chunks of a specified size). For special needs, custom algorithms can also be used. In practice, array_slice() and array_chunk() can split or group arrays by pages respectively.

Tips for handling data boundaries in PHP array paging

When performing array paging in PHP, handling data boundaries is crucial , to ensure correct results. The following are several effective ways to handle data boundaries:

1. Use array_slice()

array_slice() The function can be based on the specified length and offset to extract a part from the array. For paging, we can use the following formula:

$paged_data = array_slice($data, $start_index, $limit);

where:

• $data is the original array
• $start_index is the starting index of paging
• $limit is the number of rows to be displayed on each page

2. Use array_chunk()

array_chunk() Function splits an array into chunks of a specified size. For paging, we can use the following formula:

$paged_data = array_chunk($data, $limit);

This will create an array containing sub-arrays, each sub-array representing a page.

3. Use custom algorithms

For complex data structures or special needs, custom algorithms can also be used to handle data boundaries. For example:

function paginate_data($data, $page_number, $limit) {
    $start_index = ($page_number - 1) * $limit;
    $paged_data = [];

    for ($i = $start_index; $i < $start_index + $limit; $i++) {
        if (isset($data[$i])) {
            $paged_data[] = $data[$i];
        }
    }

    return $paged_data;
}

Practical case

Suppose we have a PHP array containing 100 elements$data, and we want to paginate it, each The page displays 10 elements.

Using array_slice():

$per_page = 10;
$current_page = 3;

$paged_data = array_slice($data, ($current_page - 1) * $per_page, $per_page);

Output:

Array (
  [0] => Element 21
  [1] => Element 22
  [2] => Element 23
  [3] => Element 24
  [4] => Element 25
  [5] => Element 26
  [6] => Element 27
  [7] => Element 28
  [8] => Element 29
  [9] => Element 30
)

Usingarray_chunk()：

$per_page = 10;

$paged_data = array_chunk($data, $per_page);

Output：

Array (
  [0] => Array (
    [0] => Element 1
    [1] => Element 2
    [2] => Element 3
    [3] => Element 4
    [4] => Element 5
    [5] => Element 6
    [6] => Element 7
    [7] => Element 8
    [8] => Element 9
    [9] => Element 10
  )

  [1] => Array (
    [0] => Element 11
    [1] => Element 12
    [2] => Element 13
    [3] => Element 14
    [4] => Element 15
    [5] => Element 16
    [6] => Element 17
    [7] => Element 18
    [8] => Element 19
    [9] => Element 20
  )

  [2] => Array (
    [0] => Element 21
    [1] => Element 22
    [2] => Element 23
    [3] => Element 24
    [4] => Element 25
    [5] => Element 26
    [6] => Element 27
    [7] => Element 28
    [8] => Element 29
    [9] => Element 30
  )
)

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