Scripts

Captcha[V2] (Spam Protection)

Door Wouter De Schuyter -12-12-2008 00:00 -7.415 views

De opvolger van mijn eerste captcha. Wat is er nieuw/veranderd? Niet heel veel eigenlijk, er zijn juist lijnen aan de achtergrond toegevoegd en een rand (natuurlijk kan je dit enabelen of disabelen). Heb ook een ander simpel font er in gestoken omdat ik wel vaker hoor dat het font twijfelachtig was (hoofdletter/kleine letter). In het voorbeeldje online gebruik ik enkel cijfers, letters gaan natuurlijk ook, moet je gewoon maar even de string met de tekens aanpassen. Download Rar: http://downloads.paradox-productions.net/?f=CAPTCHA%5BV2%5D.rar Online Voorbeeld: http://projects.paradox-productions.net/CAPTCHA%5BV2%5D/EXAMPLE.php

Download alle bestanden als ZIP

captchav2-spam-protection

<?php
#######################################
## © 2008 Wouter De Schuyter (Paradox)
## <[email protected]>
## http://paradox-productions.net/
## CAPTCHA V2.0 (SPAM PROTECTION)
#######################################

session_start(); // START SESSION

// FUNCTION TO SELECT A RANDOM CHARACTER OUT OF A STRING
function random_char($string) {
	$length = strlen($string);
	$position = mt_rand(0, $length - 1);
	return $string[$position];
}

$width = 50; // IMG WIDTH (PX)
$height = 20; // IMG HEIGHT (PX)
$characters = "0123456789"; // CHARACTERS FOR CAPTCHA STRING
$font = "fonts/font.ttf"; // FONT LOCATION
$fontS = 11; // FONT SIZE (PX)
$min = 25; // MIN NUMBER FOR THE RANDOM RGB TEXT COLOR
$max = 200; // MAX NUMBER FOR THE RANDOM RGB TEXT COLOR
$eBorder = true; // ENABLE BORDER, "true" TO ENABLE & "false" TO DISABLE
$eLines = true; // ENABLE LINES, "true" TO ENABLE & "false" TO DISABLE (RECOMMENDED TO ENABLE)
$MiLC = 200; // MIN LINE COLOR
$MaLC = 250; // MAX LINE COLOR
$maxLines = 10; // MAX LINES (RECOMMENDED BETWEEN 5 & 15)
// ADVANCED
////////////
$positionCharacterX = 3; // POSITION CHARACTER 1 ON THE X-AXIS (PX)
$characterSpace = 12; // SPACE FOR 1 CHARACTER (PX)
$positionCharactersY = 16; // SPACE ON THE Y-AXIS (PX)

// // // // // // // // // // // // //

$img = imagecreate($width, $height);
imagecolorallocate($img, 255, 255, 255); // BACKGROUND COLOR IN RGB

$randNr1 = rand($min, $max); // RANDOM NUMBER 1 BETWEEN $min & $max
$randNr2 = rand($min, $max); // RANDOM NUMBER 2 BETWEEN $min & $max
$randNr3 = rand($min, $max); // RANDOM NUMBER 3 BETWEEN $min & $max

$randomChar1 = random_char($characters); // RANDOM CHARACTER 1
$randomChar2 = random_char($characters); // RANDOM CHARACTER 2
$randomChar3 = random_char($characters); // RANDOM CHARACTER 3
$randomChar4 = random_char($characters); // RANDOM CHARACTER 4

$textcolor1 = imagecolorallocate($img, $randNr1, $randNr2, $randNr3); // TEXT COLOR 1
$textcolor2 = imagecolorallocate($img, $randNr2, $randNr3, $randNr1); // TEXT COLOR 2
$textcolor3 = imagecolorallocate($img, $randNr3, $randNr1, $randNr2); // TEXT COLOR 3
$textcolor4 = imagecolorallocate($img, $randNr3, $randNr2, $randNr1); // TEXT COLOR 4

if($eLines == true) {
	for($i=0; $i <= $maxLines; $i++) {
		$linesC = imagecolorallocate($img, rand($MiLC, $MaLC), rand($MiLC, $MaLC), rand($MiLC, $MaLC));
		imageline($img, rand(0, $width), rand(0, $height), rand(0, $width), rand(0, $height), $linesC);
	}
}

if($eBorder == true) {
	$bColor = imagecolorallocate($img, 175, 175, 175); // BORDER COLOR IN RGB
	imageline($img, 0, 0, $width, 0, $bColor);
	imageline($img, 0, $height, 0, 0, $bColor);
	imageline($img, $width-1, 0, $width-1, $height, $bColor);
	imageline($img, $width-1, $height-1, 0, $height-1, $bColor);
}

imagettftext($img, $fontS, 0, $positionCharacterX + 0 * $characterSpace, $positionCharactersY, $textcolor1, $font, $randomChar1); // CHARACTER 1
imagettftext($img, $fontS, 0, $positionCharacterX + 1 * $characterSpace, $positionCharactersY, $textcolor2, $font, $randomChar2); // CHARACTER 2
imagettftext($img, $fontS, 0, $positionCharacterX + 2 * $characterSpace, $positionCharactersY, $textcolor3, $font, $randomChar3); // CHARACTER 3
imagettftext($img, $fontS, 0, $positionCharacterX + 3 * $characterSpace, $positionCharactersY, $textcolor4, $font, $randomChar4); // CHARACTER 4

$_SESSION['captcha'] = $randomChar1 . $randomChar2 . $randomChar3 . $randomChar4; // CAPTCHA STRING FOR SESSION

header("content-type: image/png"); // CONTENT TYPE

imagepng($img); // CREATE IMAGE
imagedestroy($img); // DESTROY IMAGE
?>

font: http://projects.paradox-productions.net/CAPTCHA%5BV2%5D/fonts/font.ttf