diff --git a/captcha.php b/captcha.php new file mode 100644 index 0000000..25de7df --- /dev/null +++ b/captcha.php @@ -0,0 +1,57 @@ +$i; $i++) + $random_str .= $chars[random_int(0, count($chars)-1)]; + + return $random_str; + } + + function hex_to_rgb($hex) + { + list($r, $g, $b) = sscanf($hex, "#%02x%02x%02x"); + return array($r, $g, $b); + } + + function create_captcha($captcha_string,$width,$height,$bg,$fg) + { + $im = imagecreate($width, $height); + + $bg_rgb = hex_to_rgb($bg); + $fg_rgb = hex_to_rgb($fg); + + $background_color = imagecolorallocate($im, $bg_rgb[0], $bg_rgb[1], $bg_rgb[2]); + $text_color = imagecolorallocate($im, $fg_rgb[0], $fg_rgb[1], $fg_rgb[2]); + + $text_x = 0; + for($i=0; strlen($captcha_string)>$i; $i++) + { + $text_y = random_int(0, $height- ($height*0.60)); + imagestring($im, 5, $text_x, $text_y, $captcha_string[$i], $text_color); + $text_x += 10 + random_int(0, $width / 10 - 5); + } + + for($i=0; random_int(8, 15)>$i; $i++) + imageline($im, random_int(0,$width), random_int(0,$height), random_int(0,$width), random_int(0,$width), $text_color); + + imagepng($im); + imagedestroy($im); + } + + header("Content-Type: image/png"); + + $captcha_string = random_string(); + + $width = 130; + $height = 30; + $bg = "#000000"; + $fg = "#ffffff"; + create_captcha($captcha_string,$width,$height,$bg,$fg); + + session_start(); + $_SESSION["captcha"] = $captcha_string; +?> \ No newline at end of file diff --git a/example.php b/example.php new file mode 100644 index 0000000..588cc31 --- /dev/null +++ b/example.php @@ -0,0 +1,25 @@ + + + + Captcha example + + +
+ + +
+ + captcha + + "; + echo ($_SESSION["captcha"] == $_REQUEST["captcha"] ? "Valid" : "Invalid") . " captcha"; + echo "

"; + } + ?> + + + \ No newline at end of file