php验证码生成器

$iC=newidCode(5,60,30);

$iC->createPNG();

classidCode{

private$words=array('a','b',

'c','d','e','f','g','h','i','j','k','l',

'm','n','o','p','q','r','s','t','u','v',

'w','x','y','z','A','B','C','D','E','F',

'G','H','I','J','K','L','M','N','O','P',

'Q','R','S','T','U','V','W','X','Y','Z',

Ɔ',Ƈ',ƈ',Ɖ',Ɗ',Ƌ',ƌ',ƍ',Ǝ',Ə');

private$fonts;

private$count;//验证码字符数

private$height;

private$width;

private$path='..myfolderfonts'

private$keys;

//构造函数

publicfunction__construct($count,$width,$height){

$this->count=$count;

$this->getFonts();

$this->height =$height;

$this->width =$width;

}

privatefunctiongetFonts(){

$dir= dir($this->path);

while(false !== ($file=$dir->read())){

if($file!='.'&&$file!='..'){

$this->fonts[count($this->fonts)] =basename($file);

}

}

$dir->close();

}

privatefunctioncreateKeys(){

for($i= 0;$icount;$i++){

$this->keys[$i]['char'] =$this->words[rand(0,count($this->words)-1)];

//使用字体路径标识

$this->keys[$i]['filename'] =$this->path.'\'.$this->fonts[rand(0,count($this->fonts)-1)];

}

}

publicfunctioncreatePNG(){

$this->createKeys();

//创建画布以及颜色块儿

$bg= imagecreatetruecolor($this->width + 10*2,$this->height + 3*2);//两边留10px空白,上下3px

$grey= imagecolorallocate($bg,155,155,155);

$blue= imagecolorallocate($bg,0x00,0x00,0xff);

//填充背景

imagefill($bg,0,0,$grey);

//添加字符

$pwidth=$this->width/$this->count;

$x;$y;

for($i= 0;$icount;$i++){

$rotation= rand(-40,40);//偏转角度±40°

$fontsize= 33;

$width_txt;

$height_txt;

do{

$fontsize--;

$bbox= imagettfbbox($fontsize,$rotation,$this->keys[$i]['filename'],$this->keys[$i]['char']);

$width_txt=$bbox[2] -$bbox[0];//x 0 2 4 6,y1 3 5 7;左下，右下，右上，左上

$height_txt=$bbox[7] -$bbox[1];

}while($fontsize> 8 && ($height_txt>$this->height ||$width_txt>$pwidth));

$fontcolor= imagecolorallocate($bg,rand(0,255),rand(0,255),rand(0,255));

$x= 8 +$pwidth*$i+$pwidth/2 -$width_txt/2;//x坐标基本位置

$y=$this->height/2 -$height_txt/2;

imagettftext($bg,$fontsize,$rotation,$x,$y,$fontcolor,$this->keys[$i]['filename'],$this->keys[$i]['char']);

}

//绘制干扰线

//根据字体酌情增加干扰线

imageline($bg,0,15,40,10,$blue);

//图像输出头文件

header('Content-type:image/png');

//输出png图像

imagepng($bg);

//清除缓存资源

imagedestroy($bg);

}

publicfunctioncheckKeys($input){

if(count($input)!=$this->count){

return'ERROR:长度不正确.'

}else{

for($i=0;$icount;$i++){

//0 o O I l 1 校准,根据所选择的字体确定是否需要手动校准

if($input[$i] !=$this->keys[$i]['char']){

return'SUCCESS.'

}else{

return'ERROR:请输入正确验证码.'

}

}

}

}

}

?>