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(&#39;A&#39;,&#39;Z&#39;),range(&#39;a&#39;,&#39;z&#39;),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  
$str=&#39;&#39;;  
foreach($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=&#39;./captcha/captcha_bg&#39;.rand(1,5).&#39;.jpg&#39;;  
//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,$color);  
header(&#39;content-type:image/png&#39;);  
imagepng($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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