<?php
/*
 * Designed to be used on the command line.
 * php genpass.php [arg1] [arg2] ...
 * Accepts up to three parameters:
 * --length or -l = length of the password
 * --specialchars or -s = whether to include punctuation in generating the password
 * --unique or -u = whether to prevent repeated characters in a string
 *
 */


$short = 'l::s::u::';
$long = array('length::','special::','unique::');

$options = getopt($short, $long);

# Checks whether both --length and -l are set. If they're different, throw an error.
if( isset( $options['length']) && isset( $options['l']) ):
	if( $options['length'] !== $options['l'] ):
		throw new Exception('Both -l and --length were set and they have different values. Please use just one.');
	endif;
endif;

# Checks whether both --special and -u are set. If they're different, throw an error.
if( isset( $options['special']) && isset( $options['s']) ):
	if( $options['s'] !== $options['special'] ):
		throw new Exception('Both -s and --special were set and they have different values. Please use just one.');
	endif;
endif;

# Checks whether both --unique and -u are set. If they're different, throw an error.
if( isset( $options['unique']) && isset( $options['u']) ):
	if( $options['unique'] !== $options['u'] ):
		throw new Exception('Both -u and --unique were set and they have different values. Please use just one.');
	endif;
endif;

if( isset( $options['length']) ):
	$length = (int)$options['length'];
elseif ( isset( $options['l']) ):
	$length = (int)$options['l'];
endif;

if( isset( $options['special']) ):
	$specialchars = $options['special'];
elseif ( isset( $options['s']) ):
	$specialchars  = $options['s'];
else:
	$specialchars = 'true';
endif;

if( isset( $options['unique']) ):
	$unique = $options['unique'];
elseif ( isset( $options['u']) ):
	$unique = $options['u'];
else:
	$unique = 'false';
endif;

function genpass($l=8, $sc='true', $u='false') {
	$password = '';
	$x = 0;
	$lower_alpha = range('a','z');
	$upper_alpha = range('A','Z');
	$digits      = range(0,9);
	$punc        = explode(',','!,@,#,$,%,^,&,*,(,),+,{,},[,],=,-,_');

	if( $sc == 'true' ){
		$allowed = array_merge($lower_alpha, $upper_alpha, $digits, $punc);
	} else {
		$allowed = array_merge($lower_alpha, $upper_alpha, $digits);
	}

	$allowed_length = count($allowed);

	while($x < $l){
	    $pick = rand(0,$allowed_length-1);

		# This is a bug. It's not returning uniques.
	    if($u ==='true'):
	    	# pick a unique character. array_slice returns an array. we need the first member.
	    	$password .= array_slice($allowed, $pick, 1, false)[0];
	    else:
	   		$password .= $allowed[$pick];
	   	endif;

	    $x++;
	}
	return $password;
}


try{
	$password = genpass($length, $specialchars, $unique);

	print PHP_EOL.PHP_EOL.PHP_EOL;
	print $password;
	print PHP_EOL.PHP_EOL.PHP_EOL;

} catch(Exception $e) {

	print $e->getMessage();

}