| 标题 | PHP实现漂亮的验证码功能 |
| 内容 | 网站为了防止用户利用机器人自动注册、登录、灌水，采用了验证码技术。所谓验证码，就是将一串随机产生的数字或符号，生成一幅图片， 图片里加上一些干扰象素（防止OCR），由用户肉眼识别其中的验证码信息，输入表单提交网站验证，验证成功后才能使用某项功能。这里展示了PHP实现漂亮的验证码功能，具体代码如下： <?php class Imagecode{ private $width ; private $height; private $counts; private $distrubcode; private $fonturl; private $session; function __construct($width = 120,$height = 30,$counts = 5,$distrubcode="1235467890qwertyuipkjhgfdaszxcvbnm",$fonturl="C:\Windows\Fonts\TektonPro-BoldCond.otf"){ $this->width=$width; $this->height=$height; $this->counts=$counts; $this->distrubcode=$distrubcode; $this->fonturl=$fonturl; $this->session=$this->sessioncode(); session_start(); $_SESSION['code']=$this->session; } function imageout(){ $im=$this->createimagesource(); $this->setbackgroundcolor($im); $this->set_code($im); $this->setdistrubecode($im); ImageGIF($im); ImageDestroy($im); } private function createimagesource(){ return imagecreate($this->width,$this->height); } private function setbackgroundcolor($im){ $bgcolor = ImageColorAllocate($im, rand(200,255),rand(200,255),rand(200,255));//±³¾°ÑÕÉ« imagefill($im,0,0,$bgcolor); } private function setdistrubecode($im){ $count_h=$this->height; $cou=floor($count_h*2); for($i=0;$i<$cou;$i++){ $x=rand(0,$this->width); $y=rand(0,$this->height); $jiaodu=rand(0,360); $fontsize=rand(8,15); $fonturl=$this->fonturl; $originalcode = $this->distrubcode; $countdistrub = strlen($originalcode); $dscode = $originalcode[rand(0,$countdistrub-1)]; $color = ImageColorAllocate($im, rand(40,140),rand(40,140),rand(40,140)); imagettftext($im,$fontsize,$jiaodu,$x,$y,$color,$fonturl,$dscode); } } private function set_code($im){ $width=$this->width; $counts=$this->counts; $height=$this->height; $scode=$this->session; $y=floor($height/2)+floor($height/4); $fontsize=rand(30,35); $fonturl="C:\Windows\Fonts\AdobeGothicStd-Bold.otf";//$this->fonturl; $counts=$this->counts; for($i=0;$i<$counts;$i++){ $char=$scode[$i]; $x=floor($width/$counts)*$i+8; $jiaodu=rand(-20,30); $color = ImageColorAllocate($im,rand(0,50),rand(50,100),rand(100,140)); imagettftext($im,$fontsize,$jiaodu,$x,$y,$color,$fonturl,$char); } } private function sessioncode(){ $originalcode = $this->distrubcode; $countdistrub = strlen($originalcode); $_dscode = ""; $counts=$this->counts; for($j=0;$j<$counts;$j++){ $dscode = $originalcode[rand(0,$countdistrub-1)]; $_dscode.=$dscode; } return $_dscode; } } Header("Content-type: image/GIF"); $imagecode=new Imagecode(160,50); $imagecode->imageout(); |
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