sum.php

<?php

$opts = getopt('s:f:h', ['file:','string:','help']);
var_dump($opts);

$helpstr = <<<EOD
Description: Sum all the values given in either the file or string.
Usage: php {$argv[0]} OPTIONS

OPTIONS
 -s, --string   String of numbers to sum
 -f, --file     File to load and sum
 -h, --help     Show this help message
 
EOD;

$string = $opts['string'] ?? $opts['s'] ?? '';
$file = $opts['file'] ?? $opts['f'] ?? null;

if (empty($file) && empty($string)){
    die("Nothing to sum. \n".$helpstr);
}

if (empty($string)){
    if (!file_exists($file)){
        die("File does not exist: $file. Nothing to sum.\n$helpstr");
    }
    $string = file_get_contents($file);
    if (empty($string)){
        die("File is empty. Nothing to sum.\n$helpstr");
    }
}

if (preg_match_all('/\$((\d+),?(\d+)\.\d+)/', $string, $matches) >= 1){
    $sum = 0;
    $count = 0;
    $max = 0;
    $min = null;
    $avg = null;
    foreach($matches[1] as $i => $match){
        $value = floatval(str_replace(',','',$match));
        if (empty($value)){
            continue;
        }
        echo '$'.number_format($value, 2)."\n";
        if ($value > $max){
            $max = $value;
        }
        if (is_null($min) || $value < $min){
            $min = $value;
        }
        $sum += $value;
        $count++;
    }
    $avg = $sum/$count;
    echo "\n".$count.' entries.'."\n".
        ' => '.'$'.number_format($sum, 2)."\n".
        "Max: $".number_format($max, 2)."\n".
        "Min: $".number_format($min, 2)."\n".
        "Avg: $".number_format($avg, 2)."\n";
}