php verification code encapsulation class
The following is the php Verification code encapsulation class I compiled. If you are interested, you may wish to take a look
<?php /** *验证码封装类 */ class CaptchaLib { private $length; //验证码长度 private $font=5; //内置字体大小 1,2,3,4,5 //通过构造函数赋值 public function construct($length=4,$font=5) { $this->length=$length; $this->font=$font; } //生成随机字符串 private function generalCode() { $char_array=array_merge(range('A','Z'),range('a','z'),range(0,9));//生成一个字母和数字的数组 $index=array_rand($char_array,$this->length); //随机取4个字符,返回的是字符下标 shuffle($index); //打乱下标 //拼接字符串 $str=''; foreach($index as $i) { $str.=$char_array[$i]; } return $str; } //生成验证码 public function generalCaptcha() { $str=$this->generalCode(); //打开背景图 $bg_path='./captcha/captcha_bg'.rand(1,5).'.jpg'; //背景图地址 5张随机背景图片 $img=imagecreatefromjpeg($bg_path); //打开图片 //定义前景色 $color=imagecolorallocate($img,0,0,0); if(rand(1,2)==2) $color=imagecolorallocate($img,255,255,255); //将字符串写到图片上 $x=(imagesx($img)-imagefontwidth($this->font)*strlen($str))/2; $y=(imagesy($img)-imagefontheight($this->font))/2; imagestring($img,$this->font,$x,$y,$str,$color); header('content-type:image/png'); imagepng($img); imagedestroy($img); } } //测试 $captcha=new CaptchaLib(8,4); $captcha->generalCaptcha();
The above is what I compiled for everyone. I hope it will be helpful to everyone in the future.
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