Simple Accessible Logical CAPTCHA

Simple , yet powerful logical CAPTCHA, screen-reader accessible.

<?php
//Author Femi Hasani  [www.vision.to]
// Simple accessible captcha php
$i=1; //counter
$length = 7;//random string length
$random = "";
$question = array();
$question[1] = "first ";
$question[2] = "second ";
$question[3] = "third ";
$question[4] = "fourth ";
$question[5] = "fifth ";
$question[6] = "sixth ";
$question[7] = "seventh ";
// ... you can add more

$how_many = array();
$how_many[2] = "two letters";
$how_many[3] = "three letters";
    while($i <= $length)
    {
      $random .= chr(mt_rand(65,90));
      $i++;
    }
 $postion =  rand(0,$length-3);//random position
 $letters =  rand(2,3);//random number of letters ...

 //echo chunk_split($random,1," ")."<br />";
 echo "Result ". $new = substr($random,$postion,$letters)."<br />";
 //echo md5($new.date("Y-m-d H")."secretkey")."<br />"; //md5 comparing string with date and hour ...
 $postion = $postion+1;
// echo "position ".$postion."<br />";
// echo "letters ".$letters."<br />";
 echo "Please enter the ".$question[$postion]." ".$how_many[$letters]." of the following: ".chunk_split($random,1," ")."<br />";
?>

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