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How do I find the sum of all the digits in a number in PHP?
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String Operators ¶ The first is the concatenation operator ('. '), which returns the concatenation of its right and left arguments. The second is the concatenating assignment operator (' . = '), which appends the argument on the right side to the argument on the left side.
A number which is only divisible by 1 and itself is called prime number. Numbers 2, 3, 5, 7, 11, 13, 17, etc. are prime numbers.
array_sum(str_split($number)); This assumes the number is positive (or, more accurately, that the conversion of $number into a string generates only digits).
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