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even_digits

Language/Type: PHP recursion return

Write a recursive function named even_digits that accepts an integer parameter $n and returns a new integer containing only the even digits from $n, in the same order. If $n does not contain any even digits, return 0.

For example, the call of even_digits(8342116) should return 8426 and the call of even_digits(35179) should return 0.

Function: Write a PHP function as described, not a complete program.

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