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cesar code php

Joyous Jaguar answered on March 17, 2021 Popularity 7/10 Helpfulness 10/10

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cesar code php

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/**
 * prend une chaîne et décale chaque lettre d'un nombre donné de places dans l'alphabet.
 * takes a string, and shifts each letter by a given number of places in the alphabet.
 */
function lettersGap($string ,  $gap = 3 , $encode = true ){
    
    $alphabet   = range('a', 'z');
    $string     = strtolower($string);
    $newString  = '';

    for ($i=0; $i < strlen($string); $i++) { 

        $letter = $string[$i];

        if (in_array($letter, $alphabet)) {
            $key = array_search($letter, $alphabet);
            
            //encode
            if ($encode) {
                $newKey = $key + $gap;
                if ($newKey > 25) $newKey = $newKey - 26;
            }

            //decode
            else{
                $newKey = $key - $gap;
                if ($newKey < 0)  $newKey = $newKey + 26; 
            }

            $newLetter = $alphabet[$newKey];
            $newString .= $newLetter;
        }

        else
            $newString .= $letter;
    }

    return $newString;
}

echo lettersGap("hello world!", 3, true); //khoor zruog!
echo lettersGap("khoor zruog!" , 3 , false); //hello world!

Popularity 7/10 Helpfulness 10/10 Language php

Source: Grepper

Tags: caesar-cipher php

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Contributed on Aug 08 2022

Joyous Jaguar

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code cesar

Popularity 8/10 Helpfulness 1/10 Language php

Source: Grepper

Tags: php

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Contributed on Mar 17 2021

Encouraging Eland

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