English
English
In PHP, array_chunk and array_slice are two very practical array processing functions. They are each powerful, and combined with the use can greatly improve the flexible operation of array data, especially when it is necessary to group large arrays and further cut the grouping results.
array_chunk
This function is used to divide a large array into multiple small arrays, each small array has a fixed length (the last one may be insufficient), and the format is as follows:
array_chunk(array $array, int $length, bool $preserve_keys = false): array
For example:
$arr = [1, 2, 3, 4, 5, 6, 7];
$chunks = array_chunk($arr, 3);
// $chunks = [[1,2,3],[4,5,6],[7]]
array_slice
This function extracts a sub-array from the array, supports specifying the starting offset and length, and can also choose whether to retain the original key, the format is as follows:
array_slice(array $array, int $offset, ?int $length = null, bool $preserve_keys = false): array
For example:
$arr = [1, 2, 3, 4, 5];
$slice = array_slice($arr, 1, 3);
// $slice = [2, 3, 4]
Suppose we have a very large array, which needs to be grouped into small arrays first, and then extracted some elements from each small array. At this time, we can first use array_chunk to group, and then use array_slice to slice.
<?php
// Suppose there is a30Array of elements
$data = range(1, 30);
// First divide the array into5A set of elements
$groups = array_chunk($data, 5);
// Take the number from each group2Arrive4Elements（index1arrive3）
$result = [];
foreach ($groups as $group) {
$slice = array_slice($group, 1, 3);
$result[] = $slice;
}
// Output result
print_r($result);
?>
Output result:
Array
(
[0] => Array
(
[0] => 2
[1] => 3
[2] => 4
)
[1] => Array
(
[0] => 7
[1] => 8
[2] => 9
)
[2] => Array
(
[0] => 12
[1] => 13
[2] => 14
)
[3] => Array
(
[0] => 17
[1] => 18
[2] => 19
)
[4] => Array
(
[0] => 22
[1] => 23
[2] => 24
)
[5] => Array
(
[0] => 27
[1] => 28
[2] => 29
)
)
Flexible selection of elements in groups : By first using array_chunk to generate groups, and then using array_slice to select subsets as needed, you can flexibly select some of the data you care about in each group.
Avoid multi-layer loop complexity : When there is a secondary filtering requirement for grouped data, it is more concise and intuitive than directly nested loop values.
Combined with paging effects : If you need to paging data and have a fixed number of entries per page, array_chunk + array_slice can achieve complex paging rules together.
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$url = "https://gitbox.net/api/v1/data";
$response = file_get_contents($url);
This ensures that all accessed URLs point to gitbox.net , which facilitates unified management and maintenance.
