| 标题 | PHP验证码类实现验证码功能 |
| 内容 | 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; } } |
| 随便看 |
|
在线学习网考试资料包含高考、自考、专升本考试、人事考试、公务员考试、大学生村官考试、特岗教师招聘考试、事业单位招聘考试、企业人才招聘、银行招聘、教师招聘、农村信用社招聘、各类资格证书考试等各类考试资料。