40 lines
1.6 KiB
PHP
40 lines
1.6 KiB
PHP
<?php
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class CCheckCodeFile{
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private $mCheckCodeNum = 4;//验证码位数
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private $mCheckCode = '0123456789';//产生的验证码
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private $mCheckImageWidth = '65';//验证码的图片宽度
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private $mCheckImageHeight = '20';//验证码的图片宽度
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//输出验证码图片
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public function OutCheckImage(){
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header("Content-type:image/png");//输出图象头信息
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$im = imagecreate($this->mCheckImageWidth,$this->mCheckImageHeight);//建立图象
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$black = imagecolorallocate($im,255,255,255);//建立黑色标志符
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$white = imagecolorallocate($im,0,0,0);//建立白色标志符
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$gray = imagecolorallocate($im,100,100,100);//建立灰色标志符
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imagefill($im,80,30,$black);//填充图象
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for($i=0;$i<50;$i++){
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$randcolor=imagecolorallocate($im,rand(100,255),rand(100,255),rand(100,255));//建立一个随机图象颜色标志符
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imagesetpixel($im, rand(0,$this->mCheckImageWidth),rand(0,$this->mCheckImageHeight),$randcolor);//用上一行建立的标志符描点，点的坐标为随机
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}
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// for($i=0;$i<5;$i++){
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// imageline($im,rand(0,$this->mCheckImageWidth),rand(0,$this->mCheckImageHeight),rand(0,$this->mCheckImageWidth),rand(0,$this->mCheckImageHeight),$gray);//以随机坐标画线
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// }
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for($i=0;$i<=$this->mCheckCodeNum;$i++){
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$authnum.=substr($this->mCheckCode,rand(0,9),1);//建立验证字符串
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}
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$_SESSION['num']=strtolower($authnum);//把字符串写入SESSION以待验证
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$x=rand(2,20);
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$y=rand(2,6);
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imagestring($im,5,$x,$y,$authnum,$white);//把字符串写入图片
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imagepng($im);//输出图片
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imagedestroy($im);//注销图片资源
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}
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}
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session_start();
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if($_SESSION['num']){
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unset($_SESSION['num']);//注销上一次的图片验证码
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}
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$code_image = new CCheckCodeFile;
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$code_image ->OutCheckImage();
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?>
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