cipher-example-function-1.php

<?php
/**
 * Example cipher function
 * 
 * @param string $quote        - the quote used for the cipher base
 * @param string $secret       - the secret message
 * @param bool   $with_symbols - add random symbols to the string
 * @param bool   $lowercase    - should the quote have all lowercase lettering?
 * 
 * @return string
 */
function acme_testing_cipher_idea( $quote, $secret, $with_symbols = true, $lowercase = true ) {
    // Bail early?
    if ( empty( $quote ) || empty( $secret ) ) {
        return 'Cipher failed. Please include a string and message';
    }

    $quote = ucwords( $quote );
    if ( $lowercase ) {
        $quote = strtolower( $quote );
    }
    $quote = explode( ' ', $quote );
    $quote = preg_replace( '/[^A-Za-z0-9]/', '', $quote );

    $secret = str_shuffle( $secret );
    $secret = str_split( $secret );

    $randomized = array();

    foreach ( $quote as $word ) {
        $randomized[] = str_shuffle( $word );
    }

    $symbols = '!@#$%^&*()_+-={}[]:;,./?<>~`';

    $final = array();

    // Loop through randomized array.
    for ( $i=0; $i < count( $randomized ); $i++ ) {
        // Should we add symbols?
        if ( $with_symbols ) {
            $maybe_symbols = substr( str_shuffle( str_repeat( $symbols, rand( 1, 3 ) ) ), 0, rand( 1, 3 ) );
        }
        // Randomized word string.
        $final[] = $randomized[$i];
        // Maybe add symbols.
        $final[] = $maybe_symbols;
        // Add first letter from secret.
        $final[] = $secret[$i];
    }

    // Remove spaces from cipher.
    $cipher = join( '', $final );

    // Randomize capitalization of letters in the cipher.
    $cipher = acme_randomize_capitalization( $cipher );

    return $cipher;
}

cipher-example-function-2.php

<?php
/**
 * Randomly capitalize characters in provided string
 * 
 * @param string $text - the string of text to apply random capitalization to.
 * 
 * @return string
 */
function acme_randomize_capitalization( $text ) {
    $firstpass = str_split( $text );
    $outstring = "";
    for ( $i = 0; $i < strlen( $text ); $i++ ) {
        if ( $i == 0 ) {
            $outstring[$i] = strtoupper( $firstpass[$i] );
        } elseif ( ctype_upper( $outstring[$i-1] ) ) {
            if ( mt_rand( 0, 3 ) >= 2 ) {
                $outstring[$i] = strtoupper( $firstpass[$i] );
            } else {
                $outstring[$i] = strtolower( $firstpass[$i] );
            }
        } else {
            if ( mt_rand( 0, 3 ) >= 2 ) {
                $outstring[$i] = strtolower( $firstpass[$i] );
            } else {
                $outstring[$i] = strtoupper($firstpass[$i]);
            }
        }
    }
    return $outstring;
}

cipher-example-function-3.php

<?php
/**
 * Example cipher usage
 * 
 * @return string
 */
function acme_cipher_example_usage() {

    $quote  = 'Tilmaan: Waxaa jirta oraah ay kelmad walba xuruuftiisa isku ruxruxday, ka dibna kelmad kasta oo la ruxruxo u dhexaysa waa xaraf. Warqadahaas dheeriga ah waa waxa farriinta sirta ah ay tahay.';
    $secret = 'hiddenmessage';

    print_r( acme_testing_cipher_idea( $quote, $secret, true, false ) );
}