PHP - how to print out results?

Programming languages PHP
#1

Hello, I need to print 5 results. How i need to do this ? I try it made in loop, but not working

fscanf(STDIN, "%d", $n);

// Write an answer using echo(). DON'T FORGET THE TRAILING \n
// To debug: error_log(var_export($var, true)); (equivalent to var_dump)

$dataArray = [
    '3837339789' => '9873333789',
    '6834866643' => '8664334668',
    '7777777777777' => '7777777777777',
    '23124134334' => '43321412334',
    '3518587137' => '8753113578',
    '58232328523232' => '85332222223358',
];
foreach ( $dataArray as $dataKey => $dataValue) {
    $koeficient     = $dataValue/$dataKey;
    $testResult     = $dataKey * $koeficient;
    echo($testResult);
    echo("\n");
    error_log(var_export($testResult, true));
}
#2

This code works (I just tried it on https://onlinephp.io/) , it prints 6 values (you have 6 pairs in $dataArray, not 5).