- <?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, 0xFF, 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; $i<=$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, $color);
- imagecolordeallocate ($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
- $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));
- $x = mt_rand($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;
- }
- $pic = imagecreatetruecolor($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));
- 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);
- $color = imagecolorallocate($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
- $fontbox = imagettfbbox($fontWeight, 0, $font, $codeArray[$i]);
- $fontWidth = $fontbox[2] - $fontbox[0];
- $fontHeight = $fontbox[1] - $fontbox[7];
- $color = imagecolorallocate($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 = $eachW * ($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 ? $padding : mt_rand($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 $len 验证码字符的长度
- * @return strint 生成的验证码字符
- */
- protected function getCode($len) {
- $str = "23456789abcdefghijklmnqrstuvwxyz";
- $code = "";
- for($i=0; $i<$len; $i++) {
- $code .= $str{mt_rand(0, strlen($str)-1)};
- }
- $this->code = $code;
- return $code;
- }
- }
- //该片段来自于http://www.codesnippet.cn/detail/231220138184.html
来源: http://www.codesnippet.cn/detail/231220138184.html