In ThinkPHP, array summation is a very basic but very practical operation. This article will introduce how to use the ThinkPHP framework to perform array sums.

First, we need to have an array. Suppose we have the following array:

$arr?=?array(1,2,3,4,5);

If we want to sum this array, we can use the PHP native function array_sum():

$sum?=?array_sum($arr);
echo?$sum;?//?輸出15

Note, array_sum() is a native function. Before using it, you need to make sure that PHP has been installed and enabled relevant extensions, otherwise an error will be reported. At the same time, this method can also be used for associative arrays, for example:

$arr?=?array('a'=>1,?'b'=>2,?'c'=>3,?'d'=>4,?'e'=>5);
$sum?=?array_sum($arr);
echo?$sum;?//?輸出15

Of course, ThinkPHP also provides some methods to help us perform array sum operations.

In ThinkPHP, we can use the array_sum method to sum arrays. This method operates directly on the array without passing array parameters. For example:

$arr?=?array(1,2,3,4,5);
$sum?=?\think\helper\Arr::sum($arr);
echo?$sum;?//?輸出15

Here we use the sum method in the namespace think\helper\Arr to perform the sum operation on the array. This method returns a floating point number representing the sum of the arrays.

However, this method is not suitable when operating on associative arrays, because it can only sum index arrays. If we want to sum associative arrays, we can use the array_reduce method combined with an anonymous function to achieve it, for example:

$arr?=?array('a'=>1,?'b'=>2,?'c'=>3,?'d'=>4,?'e'=>5);
$sum?=?array_reduce($arr,?function($carry,?$item)?{
????return?$carry?+?$item;
});
echo?$sum;?//?輸出15

Here we use the array_reduce method of the array, This method accepts two parameters: the array to be processed and a callback function. The two parameters in the callback function are the accumulator and the current element. In each iteration, the accumulator and the current element are added and the result is returned. The final result is the sum of the arrays.

Of course, ThinkPHP also provides a array_reduce encapsulation method reduce for convenient array reduction operations. For example:

$arr?=?array('a'=>1,?'b'=>2,?'c'=>3,?'d'=>4,?'e'=>5);
$sum?=?\think\helper\Arr::reduce($arr,?function($carry,?$item)?{
????return?$carry?+?$item;
});
echo?$sum;?//?輸出15

Here we use the reduce method in think\helper\Arr. The first parameter of this method is the array to be processed, and the second parameter is the callback function. The usage is the same as array_reduce.

To sum up, for the array sum operation, we can use the array_sum and array_reduce methods, or we can use the array_reduce## for associative arrays. #Encapsulation methodreduce. Either way, you can easily perform array sum operations.

The above is the detailed content of Example to explain how thinkphp performs array summation. For more information, please follow other related articles on the PHP Chinese website!