User friendly password generator

friendly_password.php

<?php
/**
 * Generate user friendly password
 * @author    Marco Cesarato <cesarato.developer@gmail.com>
 * @copyright Copyright (c) 2014-2018
 * @license   http://opensource.org/licenses/gpl-3.0.html GNU Public License
 * @link      https://github.com/marcocesarato/PHP-AIO-Security-Class
 *
 * @param $string
 * @param bool $strong_lv (0-2)
 * @return mixed|string
 *
 * @example generateFriendlyPassword("Marco Cesarato 2018"); // RANDOM OUTPUT: Ce$Ar4t0_m4RCo_2018
 */
function generateFriendlyPassword($string, $strong_lv = 1) {
	$alpha_replace = array(
		'A' => '4',
		'B' => '8',
		'E' => '3',
		'S' => '$',
		'I' => '1',
		'O' => '0',
		'T' => '7',
		'L' => '2',
		'G' => '6',
	);
	$numeric_replace = array(
		'0' => 'O',
		'1' => '!',
		'4' => 'A',
		'5' => 'S',
		'6' => 'G',
		'7' => 'T',
		'8' => 'B',
	);
	$special = '_=-+#@%&*!?';
	$string = strtolower($string);

	$estr = explode(' ', $string);

	foreach ($estr as &$str) {

		$astr = str_split($str);
		$new_astr = array();

		foreach ($astr as $i => $char) {
			$char = rand(0, 100) > 50 ? strtoupper($char) : $char;
			if ($strong_lv > 0 &&
				(!empty($astr[$i - 1]) && ($new_astr[$i - 1] == $astr[$i - 1] || $astr[$i] == $astr[$i - 1]) ||
					!empty($astr[$i + 1]) && $astr[$i] == $astr[$i + 1])) {
				if($strong_lv > 1) $char = str_replace(array_keys($numeric_replace), $numeric_replace, $char);
				if(strtolower($astr[$i]) == strtolower($char)) $char = str_replace(array_keys($alpha_replace), $alpha_replace, strtoupper($char));
			}
			$new_astr[] = $char;
		}
		$str = implode('', $new_astr);
	}

	shuffle($estr);
	$string = implode(' ', $estr);
	$string = str_replace(' ', $special[rand(0, strlen($special) - 1)], $string);
	return $string;
}