PHP Captcha sistem - učiniti sliku još nečitljivijom
sistem radi tako što izabere reč iz fajla, nasumično, zatim smesti to u session i onda zove drugi fajl koji čita session i crta sliku. Fajl koji proverava ispravnost unete reči takođe iz session-a.Dakle, kod mene sve radi, samo mi treba neki trik kako da učinim tekst još više nečitljivijim?
Evo ključnog fajla:
Code:
<?php
error_reporting(0);
session_start();
$txt = $_SESSION['CaptchaWord'];
if (!isset($txt)) { $txt = $_GET['CaptchaWord']; } //test
if (!isset($txt)) { $txt = 'test'; }
$txt = trim($txt);
$colorR = $_SESSION['colorR'];
if ($colorR == -1) { $colorR = rand(50,200); } // -1 je default vr.
$colorG = $_SESSION['colorG'];
if ($colorG == -1) { $colorG = rand(50,200); } // -1 je default vr.
$colorB = $_SESSION['colorB'];
if ($colorB == -1) { $colorB = rand(50,200); } // -1 je default vr.
$myTextLen = strlen($txt);
$safeemail = imagecreate($myTextLen*15,40);
$backcolor = imagecolorallocate($safeemail,255,255,255);
$textcolor = imagecolorallocate($safeemail,$colorR,$colorG,$colorB);
$textcolor2 = imagecolorallocate($safeemail,$colorB,$colorR,$colorG);
$textcolor3 = imagecolorallocate($safeemail,$colorG,$colorG,$colorG);
imagefill($safeemail,0,0,$backcolor);
imagestring($safeemail,12,0,10,$txt,$textcolor);
imagestring($safeemail,20,10,0,$txt,$textcolor2);
imagestring($safeemail,20,rand(0,$myTextLen*15-10),rand(0,30),$txt,$textcolor3);
imagecolortransparent($safeemail,$backcolor);
header("Content-type: image/gif");
imagegif($safeemail);
imagedestroy($safeemail);
?>
<?php
error_reporting(0);
session_start();
$txt = $_SESSION['CaptchaWord'];
if (!isset($txt)) { $txt = $_GET['CaptchaWord']; } //test
if (!isset($txt)) { $txt = 'test'; }
$txt = trim($txt);
$colorR = $_SESSION['colorR'];
if ($colorR == -1) { $colorR = rand(50,200); } // -1 je default vr.
$colorG = $_SESSION['colorG'];
if ($colorG == -1) { $colorG = rand(50,200); } // -1 je default vr.
$colorB = $_SESSION['colorB'];
if ($colorB == -1) { $colorB = rand(50,200); } // -1 je default vr.
$myTextLen = strlen($txt);
$safeemail = imagecreate($myTextLen*15,40);
$backcolor = imagecolorallocate($safeemail,255,255,255);
$textcolor = imagecolorallocate($safeemail,$colorR,$colorG,$colorB);
$textcolor2 = imagecolorallocate($safeemail,$colorB,$colorR,$colorG);
$textcolor3 = imagecolorallocate($safeemail,$colorG,$colorG,$colorG);
imagefill($safeemail,0,0,$backcolor);
imagestring($safeemail,12,0,10,$txt,$textcolor);
imagestring($safeemail,20,10,0,$txt,$textcolor2);
imagestring($safeemail,20,rand(0,$myTextLen*15-10),rand(0,30),$txt,$textcolor3);
imagecolortransparent($safeemail,$backcolor);
header("Content-type: image/gif");
imagegif($safeemail);
imagedestroy($safeemail);
?>
ili samo slike, dakle, ili slike uz 'laksi' capcha sistem...