This is codeproblem.php
<?php
$alphabet = "a b c d e f g h i j k l m n o p q r s t u v w x y z";
$alphaex = explode(" ",$alphabet);
print_r ($alphaex);
echo ("<BR\>");
$inputword = "d t g c m";
$inputwordex = explode(" ",$inputword);
print_r($inputwordex);
$iword = 0;
$decodeword = "";
while ($iword < 5)
   {
    $ialpha = 0;
    $found = "N";
    while ($found == "N")
       {
         if ($inputwordex[$iword] == $alphaex[$ialpha]) 
             {
              $i = $ialpha - 2;
              $decodeword = $decodeword . $alphaex[$i];
              echo "<br>";
              echo $decodeword;
              $found = "Y";
             }
         else
             {
              $ialpha = $ialpha + 1;
             }
       }
    $iword = $iword + 1;
   }
echo "<br>";
echo $decodeword; 
?>
This is codeproblem1.php
<?php
$alphabet = "a b c d e f g h i j k l m n o p q r s t u v w x y z";
$alphaex = explode(" ",$alphabet);
print_r ($alphaex);
echo ("<br>");
$inputword = "d t g c m";
$inputwordex = explode(" ",$inputword);
print_r($inputwordex);
$ct = count($inputwordex);
$decodeword;
$iword = 0;
while ($iword <= $ct - 1)
   {
    $alpha = array_search($inputwordex[$iword],$alphaex);
    $decodeword[$iword] = $alphaex[$alpha - 2];
    $decodewd = $alphaex[$alpha - 2];
    echo "<br>";
    echo $decodewd;
    $iword = $iword + 1;
   }
$rslt = implode($decodeword);
echo "<br>";
echo $rslt;
?>