(PHP)

prob.php

<?php

function benford($str) {
	$nums = explode(' ', $str);
	$nums = array_map('firstChar', $nums);	
	$total = sizeof($nums);
	$histogram = array();
	
	foreach ($nums as $num) {
		if (isset($histogram[$num])) {
			$histogram[$num]++;
		} else {
			$histogram[$num] = 1;
		}
	}
	
	$data = array();
	
	foreach ($histogram as $numeral => $sightings) {
		$data[$numeral] = array('sightings' => $sightings, 'frequency' => round($sightings / $total * 100));
	}
	return $data;
}

function firstChar($str) {
	return $str{0};
}

$str = '123 456 789 123 123 456 456 789 789 987 987 654 654 321 321 123 123 123 456 456 123 123 123 234 231 231 231 233 233 234 564 564 564 897 897 978 987 897 897 897 654 987 789 789 789';
$data = benford($str);
ksort($data);
foreach ($data as $key => $value) {
	echo "The number $key was seen {$value['sightings']} times, which is a frequency of {$value['frequency']}%\n";
}

?>