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Neon Number

A
<?php

function isNumberNeon($input)
{
    $inputSquare = $input * $input;
    $inputArr = array_map('intval', str_split($inputSquare));
    $sumOfSquareDigits = 0;
    foreach ($inputArr as $digit) {
        $sumOfSquareDigits += $digit;
    }
    return $sumOfSquareDigits == $input;
}