How to sum array subscripts in php

Steps for summing php array subscripts: 1. Use the array_keys() function to get all the subscripts (key names) in the original array. The syntax "array_keys (original array)" will return an array containing the subscripts. Result array; 2. Use the array_sum() function to sum the result array, with the syntax "array_sum (result array)".

The operating environment of this tutorial: windows7 system, PHP version 8.1, DELL G3 computer

In php, you can use array_keys() and The array_sum() function calculates the sum of all subscripts in an array.

Implementation steps:

Step 1: Use the array_keys() function to obtain all subscripts (key names) in the original array

<?php
header(&#39;content-type:text/html;charset=utf-8&#39;);  
$arr=array(2,4,6,8,10);
var_dump($arr);
echo "所有下标：";
$key=array_keys($arr);
var_dump($key);
?>

Description:

array_key() function can get some or all key names (subscripts) in the array. The function syntax format As follows:

array_keys($array,$search_value,$strict)

Parameter description is as follows:

• $array: required parameter, which is the array to be operated;
• $search_value: Optional parameter. If the parameter is empty, the function will return all the key names in the array. If this parameter is specified, the function will only return the key name with the value $search_value;
• $strict: Optional parameter to determine whether to use strict mode when searching. $strict defaults to false, which is non-strict mode. Only types are compared during search, not types. If $strict is set to true, that is Strict mode, compares both value and type when searching, equivalent to ===.

array_key() function will return the obtained array key name in the form of an array.

Step 2: Use the array_sum() function to sum the result array

$sum=array_sum($key);
echo "所有下标的和：".$sum;

Instructions:

array_sum () function can calculate 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.

Recommended learning: "PHP Video Tutorial", "PHP ARRAY"

The above is the detailed content of How to sum array subscripts in php. For more information, please follow other related articles on the PHP Chinese website!