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// from http://stackoverflow.com/questions/6265596/how-to-convert-a-roman-numeral-to-integer-in-php

$romans = array(
    'M' => 1000,
    'CM' => 900,
    'D' => 500,
    'CD' => 400,
    'C' => 100,
    'XC' => 90,
    'L' => 50,

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<?php

function array_get_value($array, $index, $default = null){
    return array_key_exists($index, $array)?$array[$index]:$default;
}

?>

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<?php

$subject = <<<DATA
property=value property2="value2" property3='value3'
DATA;

$pattern = '(
  (?:^|\s)
  (?<name>[a-z]\w+)
  (?:=)

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$bitsOn = ($parity = $num & 1) + !!($num & 2) + !!($num & 4) + !!($num & 8) + !!($num & 16) + !!($num & 32) + !!($num & 64);

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<?php

function buildUrl($uri, array $params) {
    $matches = [];
    $pattern = '{\s* ([a-zA-Z_][a-zA-Z0-9_-]*) \s*(?:: \s* ([^{}]*(?:\{(?-1)\}[^{}]*)*))?\}';
    $optionalSegments = '\[.*'.$pattern.'\]';
    
    $uri = preg_replace_callback('~'.$optionalSegments.'~x', function($match) use ($params) {
        $uri = trim($match[0], '[]');
        if (isset($params[$match[1]])) {

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#Brittany Schaefer
#CSC 115 2-01-2020
#Program 3

#Intro
print('Welcome to iCalculator')

#accumulators
add = 0
sub = 0