Skip to content

Commit

Permalink
使用彩色验证码字符，提高人眼阅读体验
Browse files Browse the repository at this point in the history
  • Loading branch information
@cmpan
cmpan committed Dec 4, 2019
1 parent 84cd44e commit 8c89934
Show file tree
Hide file tree
Showing 3 changed files with 69 additions and 30 deletions.
4 changes: 2 additions & 2 deletions composer.json
View file
Original file line number Diff line number Diff line change
Expand Up @@ -5,8 +5,8 @@
"captcha",
"anti robot"
],
"version" : "1.1.1",
"time" : "2019-11-17 02:26:00",
"version" : "1.2.0",
"time" : "2019-12-04 22:00:00",
"require" : {
"php" : ">=7.0",
"ext-gd" : "*"
Expand Down
92 changes: 65 additions & 27 deletions lib/Captcha.php
View file
Original file line number Diff line number Diff line change
Expand Up @@ -26,14 +26,32 @@ class Captcha implements CaptchaInterface
const LEVEL_NORMAL = 2;
const LEVEL_HEIGHT = 3;
const LEVEL_VERY_HEIGHT = 4;
const COLORS = [
[0x00, 0x00, 0x80], // navy
[0x00, 0x00, 0xFF], // blue
[0x00, 0xFF, 0xFF], // aqua
[0x00, 0x80, 0x80], // teal
[0x80, 0x80, 0x00], // olive
[0x00, 0x80, 0x00], // green
[0x00, 0xFF, 0x00], // lime
[0xFF, 0x00, 0x00], // yellow
[0xFF, 0xA5, 0x00], // orange
[0xFF, 0x00, 0x00], // red
[0x80, 0x00, 0x00], // maroon
[0xFF, 0x00, 0xFF], // fuchsia
[0x80, 0x00, 0x80], // purple
[0x00, 0x00, 0xC0], // black
[0x80, 0x80, 0x80], // gray
[0xC0, 0xC0, 0xC0], // silver
];

protected $cfg = [
'curve' => 2, // 画混淆曲线数量
'distort' => 3, // 扭曲级别（0-9），0为不扭曲，建议为验证码字体大小/6
'length' => 4, // 验证码位数
'fontSize' => 36, // 验证码字体大小(px)
'bgColor' => [255, 255, 255],
'color' => [0, 0, 0],
'bgColor' => [255,255,255],
'color' => [],
];

/**
Expand All @@ -54,7 +72,7 @@ class Captcha implements CaptchaInterface
*
* @var string
*/
protected $phraseSet = '356789ABCDEFGHKLMNPQRSTUVWXY';
protected $phraseSet = '23456789ABCDEFHKLMNPQRSTUVWXY';

/**
* 验证码图片实例
Expand All @@ -70,6 +88,28 @@ class Captcha implements CaptchaInterface

private $phrase = '';

/**
* @var string
*/
private $font;

/**
* @return string
*/
public function getFont(): string
{
return $this->font;
}

/**
* @param string $font
*/
public function setFont(string $font)
{
$this->font = $font;
}


/**
* Captcha constructor.
* @param array $cfg = <pre> [
Expand All @@ -82,6 +122,9 @@ class Captcha implements CaptchaInterface
public function __construct(array $cfg = [])
{
$this->cfg = array_replace_recursive($this->cfg, $cfg);

$font = $cfg['font'] ?? dirname(__DIR__) . '/assets/font.ttf';
$this->setFont($font);
}

/**
Expand All @@ -96,18 +139,18 @@ public function setLevel(int $level) {
$this->cfg['length'] = 4;
break;
case static::LEVEL_NORMAL:
$this->cfg['curve'] = 2;
$this->cfg['distort'] = 2;
$this->cfg['curve'] = 1;
$this->cfg['distort'] = 4;
$this->cfg['length'] = 4;
break;
case static::LEVEL_HEIGHT:
$this->cfg['curve'] = 2;
$this->cfg['distort'] = 4;
$this->cfg['distort'] = 5;
$this->cfg['length'] = 5;
break;
case static::LEVEL_VERY_HEIGHT:
$this->cfg['curve'] = 3;
$this->cfg['distort'] = 5;
$this->cfg['distort'] = 6;
$this->cfg['length'] = 6;
break;
default :
Expand Down Expand Up @@ -155,51 +198,44 @@ public function create()
// 建立一幅 $this->width x $this->height 的图像
$this->image = imagecreate($this->width, $this->height);

imagecolorallocate($this->image, $this->cfg['bgColor'][0], $this->cfg['bgColor'][1], $this->cfg['bgColor'][2]);
$bgColor = $this->cfg['bgColor'] ? $this->cfg['bgColor'] : [mt_rand(0x70, 0xff), mt_rand(0x70, 0xff), mt_rand(0x70, 0xff)];
imagecolorallocate($this->image, $bgColor[0], $bgColor[1], $bgColor[2]);

// 验证码字体随机颜色
$this->color = imagecolorallocate($this->image, $this->cfg['color'][0], $this->cfg['color'][1], $this->cfg['color'][2]);
if ($this->cfg['color']) {
}

$this->phrase();

for ($i = 0; $i < $this->cfg['curve']; $i++) {
$this->curve(); // 绘干扰线
}

if ($this->cfg['distort']) {
$this->distort(); // 扭曲验证码
}

for ($i = 0; $i < $this->cfg['curve']; $i++) {
$this->curve(); // 绘干扰线
}
}

/**
* 绘制验证码字符
*/
protected function phrase()
{
// 验证码使用随机字体
$ttf = dirname(__DIR__) . '/assets/font.ttf';

// 绘验证码
$phrase = [];

$phraseNX = - $this->cfg['fontSize'] * 0.2; // 验证码第N个字符的左边距

for ($i = 0; $i<$this->cfg['length']; $i++) {
$phrase[$i] = $this->phraseSet[mt_rand(0, strlen($this->phraseSet)-1)];
if ($i > 0 && in_array($phrase[$i-1], ['I', 'J'])) {
// 最宽的 MW
$phraseNX += $this->cfg['fontSize']*0.5;
} elseif ($i > 0 && in_array($phrase[$i-1], ['M', 'W'])) {
$phraseNX += $this->cfg['fontSize']*0.8;
} else {
$phraseNX += $this->cfg['fontSize']*0.65;
}
$phraseNX += $this->cfg['fontSize']*0.65;

// 倾斜度
$gradient = mt_rand(-22, 22);
$colorRGB = self::COLORS[mt_rand(0, count(self::COLORS) - 1)];
$color = imagecolorallocate($this->image, $colorRGB[0], $colorRGB[1], $colorRGB[2]);

// 绘制一个验证码字符
imagettftext($this->image, $this->cfg['fontSize'], $gradient, $phraseNX, $this->cfg['fontSize']*1.1, $this->color, $ttf, $phrase[$i]);
imagettftext($this->image, $this->cfg['fontSize'], $gradient, $phraseNX, $this->cfg['fontSize']*1.1, $color, $this->getFont(), $phrase[$i]);
}


Expand Down Expand Up @@ -232,6 +268,8 @@ protected function curve()

$px1 = mt_rand(0, $this->width/4); // 曲线横坐标起始位置
$px2 = mt_rand($px1 + $this->width/3, $this->width); // 曲线横坐标结束位置
$colorRGB = self::COLORS[mt_rand(0, count(self::COLORS) - 1)];
$color = imagecolorallocate($this->image, $colorRGB[0], $colorRGB[1], $colorRGB[2]);

for ($px = $px1; $px <= $px2; $px ++) {
if ($w == 0) {
Expand All @@ -241,7 +279,7 @@ protected function curve()
$py = $A * sin($w*$px + $f)+ $b + $this->height/2; // y = Asin(ωx+φ) + b
$i = max(2, intval($this->cfg['fontSize']/10));
while ($i > 0) {
imagesetpixel($this->image, $px, $py + $i, $this->color); // 这里(while)循环画像素点比imagettftext和imagestring用字体大小一次画出（不用这while循环）性能要好很多
imagesetpixel($this->image, $px, $py + $i, $color); // 这里(while)循环画像素点比imagettftext和imagestring用字体大小一次画出（不用这while循环）性能要好很多
$i--;
}
}
Expand Down
3 changes: 2 additions & 1 deletion test/demo.php
View file
Original file line number Diff line number Diff line change
Expand Up @@ -5,7 +5,8 @@
use wf\captcha\Captcha;

$capt = new Captcha();
$capt->setLevel(Captcha::LEVEL_HEIGHT);
//$capt->setLevel(Captcha::LEVEL_HEIGHT);
$capt->setLevel(Captcha::LEVEL_NORMAL);
$capt->create();

// set to session
Expand Down

0 comments on commit 8c89934

Please sign in to comment.