serie; } /** * Print out the histogram, default is to print out only the numbers * in the serie, but when $min and $max is set then print also empty * values in the serie, within the range $min, $max. * * @param int $min The lowest possible integer number. * @param int $max The highest possible integer number. * * @return string representing the histogram. */ public function printHistogram(int $min = null, int $max = null) { $list = []; foreach ($this->serie as $value) { if (isset($list[$value])) { $list[$value]++; } else { $list += [$value => 1]; } } ksort($list); $result = '

'; if (isset($min) && isset($max)) { for ($j = $min; $j <= $max; $j++) { if (isset($list[$j])) { $result .= '
• ' . $j . '. '; for ($i = 0; $i < $list[$j]; $i++) { $result .= '*'; } $result .= '
'; } else { $result .= '
• ' . $j . '.
'; } } } else { foreach ($list as $key => $value) { $result .= '
• ' . $key . '. '; for ($i = 0; $i < $value; $i++) { $result .= '*'; } $result .= '
'; } } $result .= '

'; return $result; } }