PHP验证码类实现验证码功能

1、PHP验证码类实现验证码功能，有两个方法，分别是用内置字体和自定义字体生成验证码。具体代码如下：<?php/* 验证码生成类* example* $pic = new uImage();* $code = $pic->getVerifyCode(); * header(Content-type:image/png); * $pic->captchaFromFont($font=RAVIE.TTF); or $pic->captcha();*/class uImage /* 验证码字符* access protected*/protected $code;/* 生成图片验

2、证码,直接输出的是图片,字体大小是内置字体，最大是5* access public* param int $width 验证码图片宽度* param int $height 验证码图片的高度* param int $snow 背景雪花的数量* param int $line 干扰线的条数*/public function captcha($width=100, $height=30, $snow=80, $line=3) $pic = imagecreatetruecolor($width, $height);$backageColor = imagecolorallocate($pic, 0

3、xFF, 0xFF, 0xFF);imagefill($pic, 0, 0, $backageColor);/打雪花for($i=0; $i<=$snow;$i+) $color = imagecolorallocate($pic, mt_rand(150, 230), mt_rand(150, 230), mt_rand(150, 230);imagechar($pic, 1, mt_rand(0, $width), mt_rand(0, $height), *, $color);imagecolordeallocate ($pic, $color);/画干扰线for($i=0; $i

4、<=$line; $i+) $x1 = mt_rand(2, $width * 0.2);$x2 = mt_rand($width * 0.8, $width - 2);$y1 = mt_rand(2, $height - 2);$y2 = mt_rand(2, $height - 2);$color = imagecolorallocate($pic, mt_rand(130, 250), mt_rand(130, 250), mt_rand(130, 250);imageline($pic, $x1, $y1, $x2, $y2, $color);imagecolordealloca

5、te ($pic, $color);/画字符$code = $this->code;$eachW = $width / strlen($code); /图片依据字符个数分配等份数$fontWidth = imagefontwidth(5); /取得字体宽度$fontHeight = imagefontheight(5); /取得字体高度for($i=0; $i<strlen($code);$i+) $color = imagecolorallocate($pic, mt_rand(30, 155), mt_rand(30, 155), mt_rand(30, 150);$x = m

6、t_rand($eachW * $i, $eachW * ($i+1)-$fontWidth);$y = mt_rand(3, $height-$fontHeight);imagechar($pic, 5, $x, $y, $code$i, $color); /水平画字符imagecolordeallocate ($pic, $color);/输出ob_start();ob_clean();imagepng($pic);imagedestroy($pic);/* 根据自定义字体生成验证码* access public* param string $font 字符文件， TrueType 字体文

7、件，.ttf字体* param int $fontWeight 字符大小* param int $width 图片宽* param int $height 图片高* param int $snow 背景雪花个数* param int $line 干扰线条数* param int $padding 图片内边距*/public function captchaFromFont($font, $fontWeight=16, $width=100, $height=30, $snow=80, $line=3, $padding=3)if(!isset($font)return false;$pic =

8、 imagecreatetruecolor($width, $height);$backageColor = imagecolorallocate($pic, 0xFF, 0xFF, 0xFF);imagefill($pic, 0, 0, $backageColor);imagecolordeallocate ($pic, $backageColor);/打雪花for($i=0; $i<=$snow;$i+) $color = imagecolorallocate($pic, mt_rand(150, 230), mt_rand(150, 230), mt_rand(150, 230);

9、imagechar($pic, 1, mt_rand(0, $width), mt_rand(0, $height), *, $color);imagecolordeallocate ($pic, $color);/画干扰线for($i=0; $i<=$line; $i+) $x1 = mt_rand(2, $width * 0.2);$x2 = mt_rand($width * 0.8, $width - 2);$y1 = mt_rand(2, $height - 2);$y2 = mt_rand(2, $height - 2);$color = imagecolorallocate(

10、$pic, mt_rand(130, 250), mt_rand(130, 250), mt_rand(130, 250);imageline($pic, $x1, $y1, $x2, $y2, $color);imagecolordeallocate ($pic, $color);/画字符$code = $this->code;$eachW = $width / strlen($code); /图片依据字符个数分配等份数$codeArray = str_split($code);for($i=0; $i<count($codeArray); $i+)/取得字符宽高$fontbox

11、 = imagettfbbox($fontWeight, 0, $font, $codeArray$i);$fontWidth = $fontbox2 - $fontbox0;$fontHeight = $fontbox1 - $fontbox7;$color = imagecolorallocate($pic, mt_rand(30, 155), mt_rand(30, 155), mt_rand(30, 150); /字符颜色$angle = mt_rand(-20, 20); /字符角度if($i=0)$start = $eachW * $i+$padding;$end = $eachW

12、 * ($i+1)-$fontWidth;elseif($i = count($codeArray)$start = $eachW * $i;$end = $eachW * ($i+1)-$fontWidth-$padding;else$start = $eachW * $i;$end = $eachW * ($i+1)-$fontWidth-$padding;$x = $start < $end ? mt_rand($start, $end) : $start;$y = ($fontHeight+$padding) > $height ? $padding : mt_rand($

13、fontHeight+$padding, $height-$padding); imagettftext($pic, $fontWeight, $angle, $x, $y, $color, $font, $codeArray$i); /用 TrueType 字体向图像写入文本 imagecolordeallocate ($pic, $color);/输出ob_start();ob_clean();imagepng($pic);imagedestroy($pic);/* 获取验证码* access public* param int $len 验证码字符的长度* return strint 生成的验证码字符*/public function getVerifyCode($len=4)if(!isset($this->code)$this->code = $this->getCode($len);return $this->code;/* 生成验证码* access protected* param int $len 验证码字符的长度*