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<?php namespace JoshDiFabio; interface RomanNumeralGeneratorInterface { /** * @param int $number * @return string * @throws \InvalidArgumentException Argument not an integer or out of range * @author Josh Di Fabio <joshdifabio@hotmail.com> */ public function generate($number); } class RomanNumeral { const ONE = 'I'; const FIVE = 'V'; const TEN = 'X'; const FIFTY = 'L'; const ONE_HUNDRED = 'C'; const FIVE_HUNDRED = 'D'; const ONE_THOUSAND = 'M'; } class RomanNumeralGenerator implements RomanNumeralGeneratorInterface { /** * @var array * @author Josh Di Fabio <joshdifabio@hotmail.com> */ private $_numerals = array( array( 'integer' => 1000, 'symbol' => RomanNumeral::ONE_THOUSAND, ), array( 'integer' => 500, 'symbol' => RomanNumeral::FIVE_HUNDRED, ), array( 'integer' => 100, 'symbol' => RomanNumeral::ONE_HUNDRED, ), array( 'integer' => 50, 'symbol' => RomanNumeral::FIFTY, ), array( 'integer' => 10, 'symbol' => RomanNumeral::TEN, ), array( 'integer' => 5, 'symbol' => RomanNumeral::FIVE, ), array( 'integer' => 1, 'symbol' => RomanNumeral::ONE, ), ); /** * @param int $number * @return string * @throws \InvalidArgumentException Argument not an integer or out of range * @author Josh Di Fabio <joshdifabio@hotmail.com> */ public function generate($number) { if (!is_integer($number)) { throw new \InvalidArgumentException('Provided argument is not an integer.'); } if (1 > $number || 3999 < $number) { throw new \InvalidArgumentException( 'The provided number is not within the allowed range of 1 to 3999.'); } $numerals = array(); while (0 < $number) { // loop through numerals from largest to smallest foreach ($this->_numerals as $_numeralIdx => &$_numeralData) { /* * if the input number less any already selected numerals is larger than the current * numeral, choose the current numeral and deduct its integer value from the input * number */ if ($number >= $_numeralData['integer']) { $numerals[] = $_numeralData['symbol']; $number -= $_numeralData['integer']; break; } for ($_lesserNumIdx = 1 + $_numeralIdx; 7 > $_lesserNumIdx; $_lesserNumIdx++) { $_lesserNumeralData = $this->_numerals[$_lesserNumIdx]; if ($number >= $_numeralData['integer'] - $_lesserNumeralData['integer']) { $numerals[] = $_lesserNumeralData['symbol']; $numerals[] = $_numeralData['symbol']; $number -= ($_numeralData['integer'] - $_lesserNumeralData['integer']); break(2); } } } } return implode('', $numerals); } } $generator = new RomanNumeralGenerator; echo $generator->generate(3999);
Output for 5.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
MMMDMCDLCXLVXIV
Output for 5.2.3 - 5.2.17
Parse error: syntax error, unexpected T_STRING in /in/ZFlqV on line 2
Process exited with code 255.
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.2.2
<br /> <b>Parse error</b>: syntax error, unexpected T_STRING in <b>/in/ZFlqV</b> on line <b>2</b><br />
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.4.1, 5.0.0 - 5.0.5
<br /> <b>Parse error</b>: parse error, unexpected T_STRING in <b>/in/ZFlqV</b> on line <b>2</b><br />
Process exited with code 255.
Output for 4.3.2 - 4.3.4
<br /> <b>Parse error</b>: parse error in <b>/in/ZFlqV</b> on line <b>2</b><br />
Process exited with code 255.