Q: How to use array_chunk array_push array_reduce together as an example
Answer: Suppose we have an array of 10 numbers: ��������=[1,2,3,4,5,6,7,8,9,10]numbers=[1,2,3 ,4,5,6,7,8,9,10]. We want to split this array into 5 sub-arrays, each sub-array contains 2 numbers, and sum each sub-array, and finally add the sum of all sub-arrays to get the final result.
We can split the original array into 5 sub-arrays using the array_chunk function:
$chunks = array_chunk($numbers, 2);
This will generate an array with 5 subarrays containing 2 numbers each.
Next, we can use the array_reduce function to sum each subarray:
$sums = array_map(function($chunk) {
return array_reduce($chunk, function($carry, $item) {
return $carry + $item;
});
}, $chunks);
This will generate an array of 5 numbers, each number being the sum of the corresponding subarrays.
Finally, we can use the array_reduce function to add up the sums of all subarrays to get the final result:
$total = array_reduce($sums, function($carry, $item) {
return $carry + $item;
});
This will give you a number representing the sum of the sums of all subarrays.
Q: array_push is not used
Answer: I'm very sorry, I made a mistake, indeed the array_push function was not used in the above example. Thanks for your correction!
The following is an example using the array_push function:
Suppose we have an empty array $fruits = [] and we want to add a few fruit names to it. We can add the fruit names to the array one by one using the array_push function:
$fruits = [];
array_push($fruits, "apple");
array_push($fruits, "banana");
array_push($fruits, "orange");
This will generate an array $fruits = ["apple", "banana", "orange"] with 3 fruit names.
In the above example, we have used the array_push function to add elements to the array. While the array_push function is handy for adding elements to the end of an array, it doesn't do much for the current example.
Q: What about putting them together?
A: Sorry, I misunderstood. Here is an example using the array_chunk, array_push and array_reduce functions:
Suppose we have an array of 10 numbers: ������=[1,2,3,4,5,6,7,8,9,10]numbers=[1,2,3,4 ,5,6,7,8,9,10]. We want to split this array into 5 sub-arrays, each sub-array contains 2 numbers, and sum each sub-array, and finally add the sum of all sub-arrays to get the final result. At the same time, we want to add the sum of each subarray as an element to another array $sums=[] .
We can split the original array into 5 sub-arrays using the array_chunk function:
$chunks = array_chunk($numbers, 2);
This will generate an array with 5 subarrays containing 2 numbers each.
Next, we can sum each subarray using the array_reduce function and add the sum of each subarray to the $sums=[] array using the array_push function:
$sums = [];
array_reduce($chunks, function($carry, $chunk) use (&$sums) {
$sum = array_reduce($chunk, function($carry, $item) {
return $carry + $item;
});
array_push($sums, $sum);
}, 0);
This will generate an array $sums containing 5 numbers, each number being the sum of the corresponding subarrays.
Finally, we can use the array_reduce function to add up the sums of all subarrays to get the final result:
$total = array_reduce($sums, function($carry, $item) {
return $carry + $item;
});
This will give you a number representing the sum of the sums of all subarrays. At the same time, the $sums=[] array will contain the sum of all subarrays.