<?php

/**

* Created by PhpStorm.

* User: zeffee

* Date: 2016/8/12

* Time: 18:59

*/

/**

* Class Vcode

* @package App\Lib

*

* Usage:

* 1.$verify = (new Vcode);

* 2.$verify->show(); //显示图片

* 3.$data = $verify->getData(); //返回验证码类型type和文本text

*/

class Vcode

{

/**验证模式

*

* @var string

*/

private $type;

/**图片高度

*

* @var int

*/

private $img_height;

/**图片宽度

*

* @var float

*/

private $img_width;

/**文本长度

*

* @var int

*/

private $text_num;

/**最终验证的文本

*

* @var string

*/

private $verify_text;

/**字体颜色

*

* @var string

*/

private $font_color;

/**字体大小

*

* @var int

*/

private $font_size;

/**字体

*

* @var string

*/

private $font_family;

/**背景颜色

*

* @var string

*/

private $bg_color;

/**噪点

*

* @var int

*/

private $noise_point;

/**干扰线

*

* @var int

*/

private $noise_line;

/**扭曲文字

*

* @var bool

*/

private $text_distortion;

private $img_distortion;

/**图片边框

*

* @var bool

*/

private $img_border;

/**

* 实例

*/

private $image;

/**

* Vcode constructor.

*

* @param string $type "img" or "mix" or "num", 图文点击模式 或者 混合字模式 或者 数字模式

* @param int $num 验证码长度

* @param int $size 字体大小

* @param null $height 图片高度

* @param null $width 图片宽度

* @param bool $distortion 是否扭曲文字

* @param bool $border 是否生成边框

* @param int $noise_point_num 噪点

* @param int $noise_line_num 干扰线

* @param string $bg_img 背景图

* @param string $font_family 字体文件

* @param array $font_color 字体颜色

*/

public function __construct($type = "mix", $num = 5, $size = 16, $height = NULL, $width = NULL, $distortion = false, $border = false, $noise_point_num = 30, $noise_line_num = 3, $bg_img = "", $font_family = "", array $font_color = [])

{

$this->type = $type;

$this->text_num = $num;

$this->font_size = $size;

$this->img_height = $height ?: $this->getDefaultImgHeight();

$this->img_width = $width ?: $this->getDefaultImgWidth();

$this->noise_point = $noise_point_num;

$this->noise_line = $noise_line_num;

$this->text_distortion = $distortion;

$this->img_border = $border;

$this->bg_color = $bg_img;

$this->font_color = $font_color;

//字体自定义

$this->font_family = $font_family ?: "c:\\windows\\fonts\SIMYOU.ttf";

$this->run();

}

/**获取图片宽度默认值

*

* @return float

*/

private function getDefaultImgWidth()

{

return floor($this->font_size * 1.3) * $this->text_num + 10;

}

/**获取图片高度默认值

*

* @return int

*/

private function getDefaultImgHeight()

{

return $this->font_size * 2;

}

protected function run()

{

$this->initImg()->textMergeImg()->distortText()->createNoisePoint()->createNoiseLine()->createBorder();

}

/**初始化图片

*

* @return $this

*/

protected function initImg()

{

$this->image = imagecreatetruecolor($this->img_width, $this->img_height);

if ($this->font_color) {

$this->font_color = imagecolorallocate($this->image, $this->font_color[0], $this->font_color[1], $this->font_color[2]);

} else {

$this->font_color = imagecolorallocate($this->image, mt_rand(0, 100), mt_rand(0, 100), mt_rand(0, 100));

}

if ($this->bg_color) {

$this->bg_color = imagecreatefromjpeg($this->bg_color);

imagecopy($this->image, $this->bg_color, 0, 0, 0, 0, $this->img_width, $this->img_height);

} else {

$this->bg_color = imagecolorallocate($this->image, mt_rand(100, 255), mt_rand(100, 255), mt_rand(100, 255));

imagefill($this->image, 0, 0, $this->bg_color);

}

return $this;

}

/**文字写进图片

*

* @return $this

*/

protected function textMergeImg()

{

$text_arr = $this->getText();

foreach ($text_arr as $i => $text) {

if ("img" === $this->type) {

$angle = [0, 90, 270][ mt_rand(0, 2) ];

$position = imagettftext($this->image, $this->font_size, $angle, mt_rand($this->font_size + 4, $this->img_width - $this->font_size - 4), mt_rand($this->font_size + 4, $this->img_height - $this->font_size - 4), $this->font_color, $this->font_family, $text);

$this->addImgVerifyText($angle, $position);

} else {

imagettftext($this->image, $this->font_size, mt_rand(-1, 1) * mt_rand(1, 20), 5 + $i * floor($this->font_size * 1.3), floor($this->img_height * 0.75), $this->font_color, $this->font_family, $text);

}

}

return $this;

}

/**添加坐标验证文本

*

* @param $angle

* @param array $position

*/

private function addImgVerifyText($angle, array $position)

{

switch ($angle) {

case 0:

$this->verify_text["text"][] = [

"min_x" => $position[6],

"max_x" => $position[2],

"min_y" => $position[7],

"max_y" => $position[3]

];

break;

case 90:

$this->verify_text["text"][] = [

"min_x" => $position[4],

"max_x" => $position[0],

"min_y" => $position[5],

"max_y" => $position[1]

];

break;

case 270:

$this->verify_text["text"][] = [

"min_x" => $position[0],

"max_x" => $position[4],

"min_y" => $position[1],

"max_y" => $position[5]

];

break;

}

}

/**获取随机文字

*

* @return array

*/

private function getText()

{

$img_text = [];

switch ($this->type) {

case "mix":

$this->getMixVerifyText($img_text);

break;

case "num":

$this->getNumVerifyText($img_text);

break;

case "img":

$this->getImgVerifyText($img_text);

break;

}

return $img_text;

}

/**获取图片型验证文本

*

* @param $img_text

*/

private function getImgVerifyText(&$img_text)

{

for ($i = 0; $i < $this->text_num; $i++) {

$this->verify_text["type"][] = $img_text[] = $this->getRandText(2);

}

}

/**生成数字型验证文本

*

* @param $img_text

*/

private function getNumVerifyText(&$img_text)

{

$this->verify_text = ["type" => "结果"];

$img_text[0] = mt_rand(1, 99);

if ("-" === ($img_text[1] = "+-"[ mt_rand(0, 1) ])) {

$img_text[2] = mt_rand(0, $img_text[0]);

$this->verify_text["text"] = $img_text[0] - $img_text[2];

} else {

$img_text[2] = mt_rand(0, 99);

$this->verify_text["text"] = $img_text[0] + $img_text[2];

}

}

/**生成混合型验证文本

*

* @param $img_text

*/

private function getMixVerifyText(&$img_text)

{

$final_verify_text = [];

for ($i = 0; $i < $this->text_num; $i++) {

$rand_num = mt_rand(0, 3);

$final_verify_text[ $rand_num ][] = $img_text[] = $this->getRandText($rand_num);

}

$this->verify_text = $this->getVerifyText($final_verify_text);

}

/**获取指定类型的随机字符

*

* @param int $mode

*

* @return string

*/

private function getRandText($mode)

{

switch ($mode) {

//no break at all

case 0:

return "ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"[ mt_rand(0, 49) ];

case 1:

return "0123456789"[ mt_rand(0, 9) ];

case 2:

return iconv('GB2312', 'UTF-8', chr(mt_rand(179, 218)) . chr(mt_rand(179, 218)));

case 3:

return "!@#$%&*+-="[ mt_rand(0, 9) ];

}

}

/**获取最终验证的文字

*

* @param $text_arr

*

* @return array

*/

private function getVerifyText($text_arr)

{

$verify_text = [];

$rand_num = array_keys($text_arr)[ mt_rand(0, count($text_arr) - 1) ];

switch ($rand_num) {

case 0:

$verify_text["type"] = "英文";

break;

case 1:

$verify_text["type"] = "数字";

break;

case 2:

$verify_text["type"] = "中文";

break;

case 3:

$verify_text["type"] = "符号";

break;

}

$verify_text["text"] = join("", $text_arr[ $rand_num ]);

return $verify_text;

}

/**干扰文字

*

* @return $this

*/

protected function distortText()

{

if ($this->text_distortion) {

$this->img_distortion = imagecreatetruecolor($this->img_width, $this->img_height);

imagefill($this->img_distortion, 0, 0, $this->bg_color);

for ($x = 0; $x < $this->img_width; $x++) {

for ($y = 0; $y < $this->img_height; $y++) {

imagesetpixel($this->img_distortion, (int)($x + sin($y / $this->img_height * 2 * M_PI - M_PI * 0.5) * 3), $y, imagecolorat($this->image, $x, $y));

}

}

$this->image = $this->img_distortion;

}

return $this;

}

/**生成干扰点

*

* @return $this

*/

protected function createNoisePoint()

{

for ($i = 0; $i < $this->noise_point; $i++) {

$pointColor = imagecolorallocate($this->image, mt_rand(0, 255), mt_rand(0, 255), mt_rand(0, 255));

imagesetpixel($this->image, mt_rand(0, $this->img_width), mt_rand(0, $this->img_height), $pointColor);

}

return $this;

}

/**生成干扰线

*

* @return $this

*/

protected function createNoiseLine()

{

for ($i = 0; $i < $this->noise_line; $i++) {

$lineColor = imagecolorallocate($this->image, mt_rand(0, 255), mt_rand(0, 255), 20);

imageline($this->image, 0, mt_rand(0, $this->img_width), $this->img_width, mt_rand(0, $this->img_height), $lineColor);

}

return $this;

}

/**

* 生成边框

*/

protected function createBorder()

{

if ($this->img_border) {

imagerectangle($this->image, 1, 1, $this->img_width - 1, $this->img_height - 1, $this->font_color);

}

}

/**获取验证文本

*

* @return mixed

*/

public function getData()

{

return $this->verify_text;

}

/**

* 生成png

*/

public function show()

{

Header("Content-type: image/PNG; charset=utf-8");

imagepng($this->image);

}

/**

* 销毁

*/

public function __destruct()

{

imagedestroy($this->image);

if ($this->text_distortion) {

imagedestroy($this->img_distortion);

}

}

}