<?php
function make_seed()
{
  list($usec, $sec) = explode(' ', microtime());
  return (float) $sec + ((float) $usec * 100000);
}

srand(make_seed());

$chars = array(1,2,3,4,5,6,7,8,9,
"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",
"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");

$colors = array("red","blue","green","darkblue","purple","darkgreen","orange","lightgreen");

$CAPTCHA = "";
for($i=0; $i<6; $i++){
    $color = $colors[rand(0,7)];
    $CAPTCHA.= "<font color='". $color ."'>". $chars[rand(0,60)] ."</font>";
}
echo $CAPTCHA;
?>