Script to randomly pick a file and echo it, or return the filename

rfp.php

<?php
	/*
	* Script to randomly pick a file and echo it, or return the filename
	* 
	*/
	
# data
$_helpScreen = <<<OUT
	Random File Picker Help
	-=-=-=-==-=-=--==-=-=-=-
	
	php rfp.php <option>
	
	<option>	-	required
	
	Options
	--------
	
	file	-	outputs a random filename
	echo	-	outputs the contents of a random filename
OUT;
$_asciiDir = 'ascii/';
# functions
function helpScreen()
{
	echo $_helpScreen.PHP_EOL;
	exit(0);
}
function getRandomFile()
{
	# access settings
	global $_asciiDir;
	
	# get contents
	$c = scandir($_asciiDir);
	unset($c[0], $c[1]);
	$c = array_values($c);
	
	# add full path
	foreach ($c as &$file)
		$file = $_asciiDir . $file;
	
	# filter contents
	$c = array_values(
		array_filter($c, function($f){
			return (!is_dir($f));
		})
	);
	
	# pick random file
	$pick = rand(0, count($c) - 1);
	
	# return filename
	return $c[$pick];
}
function echoContents($fn)
{
	global $_asciiDir;
	echo file_get_contents($fn);
}
# init vars
$_asciiDir = __DIR__ .'/'. $_asciiDir;
# code
if (!isset($argv[1])) helpScreen();
try
{
	switch ($argv[1])
	{
		case 'file':
			echo getRandomFile();
			break;
		case 'echo':
			echoContents(getRandomFile());
			break;
		
		default:	helpScreen();
	
	}
	# terminate
	exit(0);
} 
catch (Exception $e) 
{
	exit('Error: '.$e->getMessage());
}