PHP隨機數生成器 paptcha

paptcha 是一個用來生成在網頁驗證碼中使用的隨機數的PHP函數。

function paptcha() {

error_reporting ( E_ERROR );
if (is_int(func_get_arg(0)) && abs(func_get_arg(0)) < 10)
    $dig = abs(func_get_arg(0));
  else
    $dig = 1;
if (is_int(func_get_arg(1)) && abs(func_get_arg(1)) < 10 && abs(func_get_arg(1)) > 1)
    $chs = abs(func_get_arg(1));
  else
    $chs = 2;
for($i = 0; $i < $dig; $i++)
   $res .= rand(0, 9);
// I put the result to first position of the choice array
 $choices[0] = $res;
// File the choice array with options (numbers)
 for($k = 1; $k < $chs; $k++)
   for($i = 0; $i < $dig; $i++)
     $choices[$k] .= rand(0, 9);
// Mix up a little the numbers
  shuffle ($choices);
/*

I put the result to the final position of the choice array.
Now we know that one of the results of the array is our Captcha Choice
and we can verify the answer with the last number of the array
*/
$choices[$k] = $res;
return($choices);
} //end of func</pre> 
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