php password generator, one-liner or interactive - substitutes letters for numbers, makes sure there are caps and punctuation

password-gen.php

<?php
# generates password

# Colours
function blue($text) {
    return "\e[;36m$text\e[0m";
}

function blue_bold($text) {
    return "\e[1;36m$text\e[0m";
}

function white_bold($text) {
    return "\e[1;37m$text\e[0m";
}

function yellow($text) {
    return "\e[0;33m$text\e[0m";
}

# Show and take input for choices
function show_choice($choices) {
    # Initial spacer
    echo "    ";
    # For each choice
    for ($i = 0; $i < count($choices); $i++) {
        # Show the choice
        echo white_bold($i+1 . ". ") . yellow($choices[$i]) . "\n";
        # If it is not the last
        if ($i != count($choices)-1) {
            # Intermediate spacer
            echo "    ";
        }
    }
    # Take user input
    $input = readline('> ');
    $forward = false;
    $to_return = null;
    while (!$forward) {
        # Loop through each choice
        foreach ($choices as $choice) {
            # If the input is only numbers, is within the range of choices and is equal to the current choice
            if (preg_match('/[0-9]/', $input) && !preg_match('/[a-z]/', $input) && $input <= count($choices) && $choices[$input-1] == $choice) {
                # Set the current choice to be returned
                $to_return = $choice;
            # If the input is the same as the current choice
            } elseif (strtolower($input) == strtolower($choice)) {
                # Set the current choice to be returned
                $to_return = $choice;
            }
        }
        # If there is something to return
        if ($to_return) {
            # End the loop
            $forward = true;
        # If there isn't something to return (i.e. the input is invalid)
        } else {
            slow_print("\nInvalid input.", true);
            # Take user input again
            $input = readline('> ');
        }
    }
    # Return the assigned value
    return $to_return;
}

# Define options
$input = getopt('hp::sui', ['help', 'phrase::', 'symbols', 'under', 'interactive']);

# If no flags exist
if (empty($input)) {
    echo "Use ".yellow("-h")." or ".yellow("--help")." to access the help menu.\n";
    exit;
}

# Help text
if (array_key_exists('help', $input) || array_key_exists('h', $input)) {
    echo "\n                ".blue_bold("HELP MENU")."\nSHORT       LONG        DESCRIPTION\n-h        --help        Display this text.\n\n                ".blue("GENERATION")."\n-u        --under       Replaces spaces with underscores (optional)\n-p        --phrase      Sets the phrase to turn into a password (required)\n-s        --symbols     Removes symbols from the phrase & password (optional)\n-i        --interactive Guides the user through an interactive generation experience (optional)\n\n";
    exit;
}

# If interactive
if (array_key_exists('interactive', $input) || array_key_exists('i', $input)) {
    $phrase = '';
    echo "Enter phrase:\n";
    $phrase = readline('> ');
    if (strlen($phrase) <= 2) {
        echo "Please enter a phrase longer than 2 characters.\n";
        while (strlen($phrase) <= 2) {
            $phrase = readline('> ');
        }
    }

    echo blue($phrase)."\n";

    echo "Replace spaces with underscores?\n";
    $under = show_choice(['Yes', 'No']);
    if ($under == 'Yes') {
        $under = true;
    } else {
        $under = false;
    }

    echo "Disable the addition of symbols?\n";
    $symbols = show_choice(['Yes', 'No']);
    if ($symbols == 'Yes') {
        $symbols = true;
    } else {
        $symbols = false;
    }

} else {
    # Set phrase
    $phrase = false;
    # If phrase has been chosen and isn't empty
    if (array_key_exists('phrase', $input) && !empty($input['phrase'])) {
        $phrase = $input['phrase'];
    # If p has been chosen and isn't empty
    } elseif (array_key_exists('p', $input) && !empty($input['p'])){
        $phrase = $input['p'];
    # If either are empty
    } elseif (empty($input['phrase']) || empty($input['p'])) {
        echo "Please enter a phrase.\n";
        exit;
    }

    # If phrase is less than or equal to 2 characters
    if (strlen($phrase) <= 2) {
        echo "Please enter a phrase longer than 2 characters.\n";
        exit;
    }

    echo blue($phrase)."\n";

    $under = false;
    # If the short or long flags for underscores exist
    if (array_key_exists('under', $input) || array_key_exists('u', $input)) {
        $under = true;
    # If no flags for underscores exist
    } elseif (!array_key_exists('under', $input) && !array_key_exists('u', $input)) {
        $under = false;
    }

    $symbols = false;
    # If the short or long flags for symbols exist
    if (array_key_exists('symbols', $input) || array_key_exists('s', $input)) {
        $symbols = true;
    # If no flags for symbols exist
    } elseif (!array_key_exists('symbols', $input) && !array_key_exists('s', $input)) {
        $symbols = false;
    }
}

# Symbol Handler
# Find the first space
$first = strpos($phrase, ' ');
# Define the symbols
$symbol_arr = ['!', ',', '?', '+', '@', '.', '_', '"', '£', '$', '%', '^', '&', '*', '(', ')', '-', '_', '+', '='];
# If symbols are enabled (default)
if (!$symbols) {
    # If the phrase has a space
    if ($first) {
        $phrase[$first] = $symbol_arr[array_rand($symbol_arr)];
    # If the phrase does not have a space
    } else {
        # Define array to count length
        $length_arr = [];
        # For the length of the phrase -1
        for ($i = 1; $i < strlen($phrase); $i++) {
            # Add the current number to the length
            $length_arr[] = $i;
        }
        # Assign a random symbol to a random character in the phrase
        $phrase[array_rand($length_arr)] = $symbol_arr[array_rand($symbol_arr)];
    }
}

# If underscores are enabled
if ($under) {
    # Replace spaces with underscores
    $phrase = str_replace(' ', '_', $phrase);
# If underscores are disabled (default)
} else {
    # Remove spaces
    $phrase = str_replace(' ', '', $phrase);
}

# Capitalise First
# Find all matches for the alphabet in the phrase
preg_match_all('/[a-z]/', $phrase, $matches, PREG_OFFSET_CAPTURE);
# Replace all occurences of the first letter with its capitalised version
$phrase = str_replace($matches[0][0][0], strtoupper($matches[0][0][0]), $phrase);

# Capitalise Most Common
# Turn the phrase into an array
$phrase_arr = str_split($phrase);
# Count the occurences of each letter in the phrase
$values = array_count_values($phrase_arr);
# Sort the occurence data 
arsort($values);
# Find the letter with the highest occurences
$highest = array_slice(array_keys($values), 0, 5, true);
# Loop through each common letter
foreach ($highest as $char) {
    # If the highest character is not a space
    if ($char != ' ') {
        # Replace all occurences of the most common letter with its capitalised version
        $phrase = str_replace($char, strtoupper($char), $phrase);
        break;
    }
}

# Numberise
# Turn the phrase into an array
$phrase_arr = str_split($phrase);
# Create the array that will hold the final phrase
$final_arr = [];
# Loop through the phrase array, randomly change letters to their number/symbol
foreach ($phrase_arr as $char) {
    switch ($char) {
        case ('a'):
            $final_arr[] = [4, 4, 'a'][array_rand([1, 2, 3])];
            break;
        case ('e'):
            $final_arr[] = [3, 3, 'e'][array_rand([1, 2, 3])];
            break;    
        case ('i'):
            $final_arr[] = [1, 1, 'i'][array_rand([1, 2, 3])];
            break;
        case ('o'):
            $final_arr[] = [0, 0, 'o'][array_rand([1, 2, 3])];
            break; 
        case ('u'):
            if ($symbols) {
                $final_arr[] = 'u';
            } else {
                $final_arr[] = ['^', 'u'][array_rand([1, 2])];
            }
            break;
        case ('s'):
            $final_arr[] = [5, 5, 's'][array_rand([1, 2, 3])];
            break;
        case ('t'):
            $final_arr[] = [7, 7, 't'][array_rand([1, 2, 3])];
            break;
        case ('A'):
            $final_arr[] = [4, 4, 'A', 'A', 'a'][array_rand([1, 2, 3, 4, 5])];
            break;
        case ('E'):
            $final_arr[] = [3, 3, 'E', 'E', 'e'][array_rand([1, 2, 3, 4, 5])];
            break;    
        case ('I'):
            $final_arr[] = [1, 1, 'I', 'I', 'i'][array_rand([1, 2, 3, 4, 5])];
            break;
        case ('O'):
            $final_arr[] = [0, 0, 'O', 'O', 'o'][array_rand([1, 2, 3, 4, 5])];
            break; 
        case ('U'):
            if ($symbols) {
                $final_arr[] = 'U';
            } else {
                $final_arr[] = ['^', '^', 'U', 'U', 'u'][array_rand([1, 2, 3, 4, 5])];
            }
            break;
        case ('S'):
            $final_arr[] = [5, 5, 'S', 'S', 's'][array_rand([1, 2, 3, 4, 5])];
            break;
        case ('T'):
            $final_arr[] = [7, 7, 'T', 'T', 'T'][array_rand([1, 2, 3, 4, 5])];
            break;
        default:
            $final_arr[] = $char;
            break;
    }
}

# Turn the array back into a string
$phrase = implode('', $final_arr);
echo "$phrase\n";