How to Efficiently Calculate the Sum of Digits in a Numeric String Using PHP?

Calculating the Sum of Digits in a Numeric String in PHP

Question: How can you efficiently compute the sum of all digits within a numeric string using PHP?

Answer:

To calculate the sum of digits in a numeric string in PHP, you can utilize the following concise approach:

<code class="php">array_sum(str_split($number));</code>

This method requires the number to be a positive integer or a string that converts into digits when converted to a string. Here's how it works:

1. Convert to String: The numeric string is converted into a string using (string)$number. This is necessary for the subsequent operations.
2. Split into Digits: The str_split() function is employed to split the string into an array of individual characters, each of which represents a digit.
3. Convert to Integers: Each element in the string array is then cast to an integer using implicit type casting, which converts digits into their numerical values.
4. Sum Digits: Finally, array_sum() is utilized to compute the sum of the integer digits in the array, effectively giving you the sum of all digits in the original numeric string.

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