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Danas sam pokušao da napravim visual confirmation (captcha) za mail formu na svom sajtu, jer sam jutros naišao na gomilu mailova koje mi je poslao bot upravo preko te forme.
Ukratko naišao sam na jedan tutorijal i sve sam pratio, napravio i sve radi kao zaseban fajl, slika sa tekstom se uredno prikazuje.
Međutim, problem nastaje kad taj kod hoću da integrišem u obrazac.
Pokušao sam samo sa copy/paste i da ga uvezem preko funkcije include().
U oba slučaja dobijam sledeću upozorenje
Warning: session_start() [function.session-start]: Cannot send session cache limiter - headers already sent (output started at /home/pixelweb/public_html/kontakt.php:3) in /home/pixelweb/public_html/captcha.php on line 3
Warning: Cannot modify header information - headers already sent by (output started at /home/pixelweb/public_html/kontakt.php:3) in /home/pixelweb/public_html/captcha.php on line 56
Sama stranica captcha.php ima sledeći kod
<?php
//Start the session so we can store what the code actually is.
session_start();
//Now lets use md5 to generate a totally random string
$md5 = md5(microtime() * mktime());
/*
We dont need a 32 character long string so we trim it down to 5
*/
$string = substr($md5,0,5);
/*
Now for the GD stuff, for ease of use lets create
the image from a background image.
*/
$captcha = imagecreatefrompng("captcha.png");
/*
Lets set the colours, the colour $line is used to generate lines.
Using a blue misty colours. The colour codes are in RGB
*/
$black = imagecolorallocate($captcha, 0, 0, 0);
$line = imagecolorallocate($captcha,233,239,239);
/*
Now to make it a little bit harder for any bots to break,
assuming they can break it so far. Lets add some lines
in (static lines) to attempt to make the bots life a little harder
*/
imageline($captcha,0,0,39,29,$line);
imageline($captcha,40,0,64,29,$line);
/*
Now for the all important writing of the randomly generated string to the image.
*/
imagestring($captcha, 20, 20, 20, $string, $black);
/*
Encrypt and store the key inside of a session
*/
$_SESSION['key'] = md5($string);
/*
Output the image
*/
header("Content-type: image/png");
imagepng($captcha);
?>
Ima li ko ideju gde je problem?
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