<?php

//	Christopher Pei
//	April 12, 2021


if (isset($argv[1])){
	
	if (file_exists($argv[1])){
		
		$input_file = fopen($argv[1], "r") or die("Unable to open file.");
		$input = fread($input_file, filesize($argv[1]));
		fclose($input_file);
		
		$values = explode(',', $input);
		$unique = array();
		
		foreach ($values as $value){
		
			if (!in_array((string)$value, $unique)){
				array_push($unique, (string)$value);
			}
		}
		
		echo "\n Results\n =========================\n";
		foreach ($unique as $u){
			echo " " . $u . "\n";
		}
		
		return 0;
	}
	
	else{
		
		echo " > Sorry, file '" . $argv[1] . "' does not exist.\n";
		return 1;
	}
}
else{

	echo "\n Incorrect Syntax\n =========================\n";
	echo " > Missing filename with values.\n";
	echo "\n > Usage Example:\n";
	echo "   > \"php " . $argv[0] . " values.txt\n";
	return 1;
}