PHP验证码-CI框架

一款开源的cms稍微改下

/**

* Security_code_model 验证码类

* @package Security_code_model

*/

class Security_code_model extends CI_Model {

public $config = array();

function __construct(){

parent::__construct();

$this->config = array(

'font_size' => 14,

'img_height' => 24,

'word_type' => 1, // 1:数字 2:英文 3:单词

'img_width' => 68,

'use_boder' => TRUE,

'font_file' => dirname(__FILE__).'/security.inc/ggbi.ttf',

'wordlist_file' => dirname(__FILE__).'/security.inc/words.txt',

'filter_type' => 5);

}

function show_img(){

if (!$this->echo_validate_image($this->config))

{

// 如果不成功则初始化一个默认验证码

@session_start();

$_SESSION['securimage_code_value'] = strtolower('abcd');

$im = @imagecreatefromjpeg(dirname(__FILE__).'/security.inc/vdcode.jpg');

header("Pragma:no-cache/r/n");

header("Cache-Control:no-cache/r/n");

header("Expires:0/r/n");

imagejpeg($im);

imagedestroy($im);

}

}

function echo_validate_image( $config = array() )

{

@session_start();

//主要参数

$font_size = isset($config['font_size']) ? $config['font_size'] : 14;

$img_height = isset($config['img_height']) ? $config['img_height'] : 24;

$img_width = isset($config['img_width']) ? $config['img_width'] : 68;

$font_file = isset($config['font_file']) ? $config['font_file'] : PATH_DATA.'/data/font/ggbi.ttf';

$use_boder = isset($config['use_boder']) ? $config['use_boder'] : TRUE;

$filter_type = isset($config['filter_type']) ? $config['filter_type'] : 0;

//创建图片，并设置背景色

$im = @imagecreate($img_width, $img_height);

imagecolorallocate($im, 255,255,255);

//文字随机颜色

$fontColor[] = imagecolorallocate($im, 0x15, 0x15, 0x15);

$fontColor[] = imagecolorallocate($im, 0x95, 0x1e, 0x04);

$fontColor[] = imagecolorallocate($im, 0x93, 0x14, 0xa9);

$fontColor[] = imagecolorallocate($im, 0x12, 0x81, 0x0a);

$fontColor[] = imagecolorallocate($im, 0x06, 0x3a, 0xd5);

//获取随机字符

$rndstring = '';

if ($config['word_type'] != 3)

{

for($i=0; $i<4; $i++)

{

if ($config['word_type'] == 1)

{

$c = chr(mt_rand(48, 57));

} else if($config['word_type'] == 2)

{

$c = chr(mt_rand(65, 90));

if( $c=='I' ) $c = 'P';

if( $c=='O' ) $c = 'N';

}

$rndstring .= $c;

}

} else {

$fp = @fopen($config['wordlist_file'], 'rb');

if (!$fp) return FALSE;

$fsize = filesize($config['wordlist_file']);

if ($fsize < 32) return FALSE;

if ($fsize < 128)

{

$max = $fsize;

} else {

$max = 128;

}

fseek($fp, rand(0, $fsize - $max), SEEK_SET);

$data = fread($fp, 128);

fclose($fp);

$data = preg_replace("//r?/n/", "/n", $data);

$start = strpos($data, "/n", rand(0, 100)) + 1;

$end = strpos($data, "/n", $start);

$rndstring = strtolower(substr($data, $start, $end - $start));

}

$_SESSION['securimage_code_value'] = strtolower($rndstring);

$rndcodelen = strlen($rndstring);

//背景横线

$lineColor1 = imagecolorallocate($im, 0xda, 0xd9, 0xd1);

for($j=3; $j<=$img_height-3; $j=$j+3)

{

imageline($im, 2, $j, $img_width - 2, $j, $lineColor1);

}

//背景竖线

$lineColor2 = imagecolorallocate($im, 0xda,0xd9,0xd1);

for($j=2;$j<100;$j=$j+6)

{

imageline($im, $j, 0, $j+8, $img_height, $lineColor2);

}

//画边框

if( $use_boder && $filter_type == 0 )

{

$bordercolor = imagecolorallocate($im, 0x9d, 0x9e, 0x96);

imagerectangle($im, 0, 0, $img_width-1, $img_height-1, $bordercolor);

}

//输出文字

$lastc = '';

for($i=0;$i<$rndcodelen;$i++)

{

$bc = mt_rand(0, 1);

$rndstring[$i] = strtoupper($rndstring[$i]);

$c_fontColor = $fontColor[mt_rand(0,4)];

$y_pos = $i==0 ? 4 : $i*($font_size+2);

$c = mt_rand(0, 15);

@imagettftext($im, $font_size, $c, $y_pos, 19, $c_fontColor, $font_file, $rndstring[$i]);

$lastc = $rndstring[$i];

}

//图象效果

switch($filter_type)

{

case 1:

imagefilter ( $im, IMG_FILTER_NEGATE);

break;

case 2:

imagefilter ( $im, IMG_FILTER_EMBOSS);

break;

case 3:

imagefilter ( $im, IMG_FILTER_EDGEDETECT);

break;

default:

break;

}

header("Pragma:no-cache/r/n");

header("Cache-Control:no-cache/r/n");

header("Expires:0/r/n");

//输出特定类型的图片格式，优先级为 gif -> jpg ->png

//dump(function_exists("imagejpeg"));

if(function_exists("imagejpeg"))

{

header("content-type:image/jpeg/r/n");

imagejpeg($im);

}

else

{

header("content-type:image/png/r/n");

imagepng($im);

}

imagedestroy($im);

exit();

}

}

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