/**

* 图像操作类

*/

class helper_image

{

/**

* 生成图像验证码

* @static

* @access public

* @param string $length 位数

* @param string $mode 类型

* @param string $type 图像格式

* @param string $width 宽度

* @param string $height 高度

* @return string

*/

static function buildImageVerify($length=4, $mode=1, $type='png', $width=48, $height=22, $verifyName='verify') {

ob_clean();

$randval = helper_string::randString($length, $mode);

$session = Yaf_Session::getInstance();

$tmp = strtoupper($randval);

$session->$verifyName = $tmp;

$width = ($length * 10 + 10) > $width ? $length * 10 + 10 : $width;

if ($type != 'gif' && function_exists('imagecreatetruecolor')) {

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

} else {

$im = imagecreate($width, $height);

}

$r = Array(225, 255, 255, 223);

$g = Array(225, 236, 237, 255);

$b = Array(225, 236, 166, 125);

$key = mt_rand(0, 3);

$backColor = imagecolorallocate($im, $r[$key], $g[$key], $b[$key]); //背景色(随机)

$borderColor = imagecolorallocate($im, 100, 100, 100); //边框色

imagefilledrectangle($im, 0, 0, $width - 1, $height - 1, $backColor);

imagerectangle($im, 0, 0, $width - 1, $height - 1, $borderColor);

$stringColor = imagecolorallocate($im, mt_rand(0, 200), mt_rand(0, 120), mt_rand(0, 120));

// 干扰

for ($i = 0; $i < 10; $i++) {

imagearc($im, mt_rand(-10, $width), mt_rand(-10, $height), mt_rand(30, 300), mt_rand(20, 200), 55, 44, $stringColor);

}

for ($i = 0; $i < 25; $i++) {

imagesetpixel($im, mt_rand(0, $width), mt_rand(0, $height), $stringColor);

}

for ($i = 0; $i < $length; $i++) {

imagestring($im, 5, $i * 10 + 5, mt_rand(1, 8), $randval{$i}, $stringColor);

}

helper_image::output($im, $type);

}

static function output($im, $type='png', $filename='') {

header("Content-type: image/" . $type);

$ImageFun = 'image' . $type;

if (empty($filename)) {

$ImageFun($im);

} else {

$ImageFun($im, $filename);

}

imagedestroy($im);

}

static function echo_validate_image( $config = array(), $verifyName)

{

$config = array(

'font_size' => 14,

'img_height' => 24,

'word_type' => 2, // 1:数字 2:英文

'img_width' => 68,

'use_boder' => TRUE,

'font_file' => ROOT_PATH.'/public/admin/image/ggbi.ttf',

'filter_type' => 5);

//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'] : ROOT_PATH.'/public/admin/image/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 = '';

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;

}

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

$session = Yaf_Session::getInstance();

$tmp = strtoupper($rndstring);

$session->$verifyName = $tmp;

$rndcodelen = strlen($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

{

$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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