Bruteforce attack password generator [CLI]

<?php
    set_time_limit(0);

    // Set the exception handler
    set_exception_handler(function(Exception $e){
        print "-- " .$e->getMessage();
    });

    // Only run in the CLI
    if(php_sapi_name() != 'cli'){
        throw new Exception('This script is accessible only through the command line!');
    }

    // Get the passed arguments in the command line
    $arguments = $_SERVER['argv'];
    unset($arguments[0]);

    if(count($arguments) < 1){
        throw new Exception('You need to provide some keywords to help create more promising passwords!');
    }

    // Ready the keywords list
    $keywords = implode(' ', $arguments);
    $keywords = trim($keywords, ',');
    $keywords = explode(',', $keywords);
    $keywords = array_map('trim', $keywords);
    $keywords = array_unique($keywords);

    if(!count($keywords)){
        throw new Exception('No keywords were provided!');
    }

    // If one of the keywords is an email address
    foreach($keywords as $i => $keyword){
        if(strpos($keyword, '@')){
            unset($keywords[$i]);

            // Drop the trailing service provider domain name, eg: xx@gmail.com ~> xx
            $keywords[] = explode('@', $keyword)[0];
        }
    }

    /////////////////////////

    // A list of common numerical combinations used in passwords
    $numericPasswordsCombinations = ['0123', '0123456', '0123456789', 9876543210, 123, 321, 123456, 654321, 147852369,
        369852741, 159357, 951753, 456852, 789654321, 123654789, 112233, 445566, 778899, 112233445566, 985236,
        147852, 14789632, 98741236, 36987412, 78963214, 47896321, 89632147, 563214789, 541236987, '01478963',
        '0147896325', '0987654321', 123456789];

    // Create the passwords
    // Probability #1: the password is one of the keywords!
    {
        $passwords = [];
        foreach($keywords as $keyword){
            $passwords[] = $keyword;

            // Try some other variants of the same keyword
            if(strpos($keyword, ' ')){
                $keywords[] = $passwords[] = str_replace(' ', '_', $keyword);
                $keywords[] = $passwords[] = str_replace(' ', '-', $keyword);
            }
        }
    }

    // Probability #2: one of the numerical combinations
    {
        $passwords += $numericPasswordsCombinations;
    }

    // Probability #3: a combination of the keywords and the numbers
    {
        foreach($numericPasswordsCombinations as $number){
            foreach($keywords as $keyword){
                $passwords[] = $keyword .'_' .$number;
                $passwords[] = $keyword .$number;
                $passwords[] = $number .$keyword;
            }
        }
    }

    // Create the passwords.txt file
    if(!@file_put_contents('passwords.txt', implode(PHP_EOL, $passwords))){
        throw new Exception('Passwords were generated, but cannot create the passwords.txt file!');
    }

    print 'Success! passwords.txt contains ' .count($passwords) .' password. Have fun!';