Question

How to check if a number and its double contain exactly the same digits in PHP

Answer 1

function same_digits_double_number($n) {
    $numStr = strval($n);
    $doubleNumStr = strval($n * 2);
    
    $numArr = str_split($numStr);
    $doubleNumArr = str_split($doubleNumStr);
    
    sort($numArr);
    sort($doubleNumArr);
    
    return strcmp(implode($numArr), implode($doubleNumArr)) === 0;
}

$n = 125874;

echo same_digits_double_number($n) ? "true" : "false";




/*
run:

true

*/

 

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