captcha.php

<?


/**
 * @package   Zcore
 * @author     Artem Sokolovsky
 * @url           http://vk.com/x_s_s
 */

$width = 97;
$height = 27;
$sign = 5;
$code = "";
session_start();
  
$letters = array( 'a','b','c','d','e','f',
                 'g','h','j','k','m','n',
                 'p','q','r','s','t','u',
                 'v','w','x','y','z','2',
                 '3','4','5','6','7','8','9' );
				   
$figures = array( '50','70','90','110',
                 '130','150','170','190','210' );

$img = imagecreatetruecolor($width, $height);

$fon = imagecolorallocate($img, 255, 255, 255);
imagefill($img, 0, 0, $fon);
  
for($i=0; $i<$sign; $i++)
	{
		$h = 1;
		$color = imagecolorallocatealpha(
					$img,
                    $figures[rand(0, count($figures)-1)],
                    $figures[rand(0, count($figures)-1)],
                    $figures[rand(0, count($figures)-1)],
                    rand( 10, 30 ) ); 

		$letter = $letters[rand( 0,sizeof($letters)-1 )];

		if( empty( $x ) ) $x = $width*0.08;
			else $x = $x + ( $width*0.8 )/$sign+rand( 0,$width*0.01 );

		if( $h == rand( 1, 2 ) ) $y = ( ( $height*1 )/4 ) + rand( 0, $height*0.1 );
			else $y = ( ( $height*1 )/4 ) - rand( 0, $height*0.1 );
		
		$code.= $letter;
		imagestring( $img, 6 ,$x, $y, $letter, $color );
	}

$_SESSION['code'] = $code;

header ( "Content-type: image/jpeg" ); 
imagejpeg( $img );

?>