Home>Article>Backend Development> How to sum specified fields in php two-dimensional array
Summing steps: 1. Use the array_column() function to obtain all elements of the specified field (column) in the two-dimensional array. The syntax "array_column(two-dimensional array, 'specified field name')" will return a A result array containing all elements of the specified field; 2. Use the array_sum() function to calculate the sum of all elements in the result array, with the syntax "array_sum (result array)".
The operating environment of this tutorial: Windows 7 system, PHP version 8.1, DELL G3 computer
In PHP, you can use the array_column() function and array_sum() function to obtain all elements of the specified field in the two-dimensional array and sum them.
Implementation steps:
Step 1: Use the array_column() function to obtain all elements of the specified field (column) in the two-dimensional array
array_column() Returns the value of a single column in the input array.
array_column(array,column_key,index_key);
| Parameters | Description |
|---|---|
| array | Required. Specifies the multidimensional array (record set) to use. |
| column_key | Required. The column whose value needs to be returned. Can be an integer index of a column of an index array, or a string key value of a column of an associative array. This parameter can also be NULL, in which case the entire array will be returned (very useful when used with the index_key parameter to reset the array key). |
| index_key | Optional. The column that is the index/key of the returned array. |
Return value: Return an array. The value of the array is the value of a single column in the input array.
Just set the second parameter of the function to the specified field name to get all the elements of the specified field (column) in the two-dimensional array
"小明", 'score' => 85, 'age' => 25 ), array( 'name' => "小华", 'score' => 92, 'age' => 20 ), array( 'name' => "霄晓", 'score' => 100, 'age' => 22 ), array( 'name' => "萧洁", 'score' => 99, 'age' => 21 ), array( 'name' => "赵峰", 'score' => 96, 'age' => 24 ) ); var_dump($arr); echo "指定字段 score 的全部元素："; $score=array_column($arr, 'score'); var_dump($score); echo "指定字段 age 的全部元素："; $age=array_column($arr, 'age'); var_dump($age); ?>
Step 2. Use the array_sum() function to sum the result array
echo "指定字段 score 的全部元素："; $score=array_column($arr, 'score'); var_dump($score); $sum=array_sum($score); echo "指定字段 score 的元素和：".$sum; echo "指定字段 age 的全部元素："; $age=array_column($arr, 'age'); var_dump($age); $sum=array_sum($age); echo "指定字段 age 的元素和：".$sum;
Instructions:
array_sum() function can Calculates the sum of all elements in the specified array.
array_sum ( $arr )
If all elements of array arr are integers, return an integer value; if one or more of the values are floating point numbers, return a floating point number.
If there are non-numeric elements in the array arr, PHP will try to convert them to a numeric value, and if the conversion fails, it will be treated as a 0 value. For example, the string "45" will be converted to the integer 45, and the string "12.4abc" will be converted to the decimal 12.4.
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