Hi, all
I'm new here so not sure if i'm doing this right but i was hoping to create my own form of PHP based encryption function. I'm sure there are already functions out there but i wanted to see if this was something i could do personally. So my situation is i have used the str_replace function to change the inputted letters to numbers then explode the string to an array. Then I add on however many in the alphabet i would like to move the inputted string down the alphabet by then this array is simply imploded and re-written back into the alphabet. This issue i have is as some might have already realized yet i find it hard to explain so i have to give an example, so say i have abcdefgh and i want to move it down 4 this would first turn into 1,2,3,4,5,6,7,8 then i would add on 4 to each number so this would make 5,6,7,8,9,10,11,12 then as i try to change this back to letters anything above 9 is read as separate number so i would get this changed back to e,f,g,h,i,a,0,a,a,a,b. I know that it recognizes the double digit numbers as two separate numbers but i'm not sure how i could get past this. below is the code and yes before anyone says it, i' m sure there's an easier way but i only clear up my code once i get the outcome i want. Thank-you for reading this, Canaan.
<?php
function encrypt($string, $multiplyer)
{
$string = preg_replace('/\s+/', '', $string);
$legnthofstring = strlen($string);
$string = strtolower($string);
$string = str_replace("a","1",$string);
$string = str_replace("b","2",$string);
$string = str_replace("c","3",$string);
$string = str_replace("d","4",$string);
$string = str_replace("e","5",$string);
$string = str_replace("f","6",$string);
$string = str_replace("g","7",$string);
$string = str_replace("h","8",$string);
$string = str_replace("i","9",$string);
$string = str_replace("j","10",$string);
$string = str_replace("k","11",$string);
$string = str_replace("l","12",$string);
$string = str_replace("m","13",$string);
$string = str_replace("n","14",$string);
$string = str_replace("o","15",$string);
$string = str_replace("p","16",$string);
$string = str_replace("q","17",$string);
$string = str_replace("r","18",$string);
$string = str_replace("s","19",$string);
$string = str_replace("t","20",$string);
$string = str_replace("u","21",$string);
$string = str_replace("v","22",$string);
$string = str_replace("w","23",$string);
$string = str_replace("x","24",$string);
$string = str_replace("y","25",$string);
$string = str_replace("z","26",$string);
$arr1 = str_split($string);
$counter = 0;
$los=$legnthofstring;
while($counter < $los)
{
$arr1[$counter] += $multiplyer;
$counter ++;
}
$tring = implode(",", $arr1);
echo($tring);
echo"<p>";
$tring = str_replace("1","a",$tring);
$tring = str_replace("2","b",$tring);
$tring = str_replace("3","c",$tring);
$tring = str_replace("4","d",$tring);
$tring = str_replace("5","e",$tring);
$tring = str_replace("6","f",$tring);
$tring = str_replace("7","g",$tring);
$tring = str_replace("8","h",$tring);
$tring = str_replace("9","i",$tring);
$tring = str_replace("10","j",$tring);
$tring = str_replace("11","k",$tring);
$tring = str_replace("12","l",$tring);
$tring = str_replace("13","m",$tring);
$tring = str_replace("14","n",$tring);
$tring = str_replace("15","o",$tring);
$tring = str_replace("16","p",$tring);
$tring = str_replace("17","q",$tring);
$tring = str_replace("18","r",$tring);
$tring = str_replace("19","s",$tring);
$tring = str_replace("20","t",$tring);
$tring = str_replace("21","u",$tring);
$tring = str_replace("22","v",$tring);
$tring = str_replace("23","w",$tring);
$tring = str_replace("24","x",$tring);
$tring = str_replace("25","y",$tring);
$tring = str_replace("26","z",$tring);
echo $tring;
}
encrypt("abcdefg",3);
