Support Chinese alphanumeric, custom font php verification code program

Support Chinese alphanumeric, custom font php verification code program_PHP tutorial

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Release： 2016-07-13 17:10:22

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Verification codes are often used on login pages, message pages, and registration pages. The principle of verification codes is very simple: use the GD library to create an image. Of course, the image must add the necessary interference code, and then save it to SESSION on the server side, waiting for the user Determine whether the sessions are the same when submitting.

The code is as follows

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/*
* Captcha Class base on PHP GD Lib
* @author Design
* @version 1.0
* @copyright js8.in 2010
* @demo
* include('captchaClass.php');
* $captchaDemo=new Captcha();
* $captchaDemo->createImage();
*/
class Captcha{
//@Define the height of the verification code image
private $height;
//@Define verification code image width
private $width;
//@Define the number of characters in the verification code
private $textNum;
//@Define verification code character content
private $textContent;
//@Define character color
private $fontColor;
//@Define the random text color
private $randFontColor;
//@Define font size
private $fontSize;
//@Define font
private $fontFamily;
//@Define background color
private $bgColor;
//@Define the random background color
private $randBgColor;
//@Define character language
private $textLang;
//@Define the number of interference points
private $noisePoint;
//@Define the number of interference lines
private $noiseLine;
//@Whether the definition is distorted
private $distortion;
//@Define distorted image source
private $distortionImage;
//@Define whether there is a border
private $showBorder;
//@Define verification code image source
private $image;

//@Constructor constructor
public function Captcha(){
$this->textNum=4;
$this->fontSize=16;
$this->fontFamily='c:windowsfontsSIMYOU.ttf';//Set the Chinese font, which can be changed to the Linux directory
$this->textLang='en';
$this->noisePoint=30;
$this->noiseLine=3;
$this->distortion=false;
$this->showBorder=false;
}

//@Set image width
public function setWidth($w){
$this->width=$w;
}

//@Set image height
public function setHeight($h){
$this->height=$h;
}

//@Set the number of characters
public function setTextNumber($textN){
$this->textNum=$textN;
}

//@Set character color
public function setFontColor($fc){
$this->fontColor=sscanf($fc,'#%2x%2x%2x');
}

//@Set font size
public function setFontSize($n){
$this->fontSize=$n;
}

//@Set font
public function setFontFamily($ffUrl){
$this->fontFamily=$ffUrl;
}

//@Set character language
public function setTextLang($lang){
$this->textLang=$lang;
}

//@Set picture background
public function setBgColor($bc){
$this->bgColor=sscanf($bc,'#%2x%2x%2x');
}

//@Set the number of interference points
public function setNoisePoint($n){
$this->noisePoint=$n;
}

//@Set the number of interference lines
public function setNoiseLine($n){
$this->noiseLine=$n;
}

//@Set whether to distort
public function setDistortion($b){
$this->distortion=$b;
}

//@Set whether to display the border
public function setShowBorder($border){
$this->showBorder=$border;
}

//@Initialization verification code picture
public function initImage(){
if(empty($this->width)){$this->width=floor($this->fontSize*1.3)*$this->textNum+10;}
if(empty($this->height)){$this->height=$this->fontSize*2;}
$this->image=imagecreatetruecolor($this->width,$this->height);
if(empty($this->bgColor)){
$this->randBgColor=imagecolorallocate($this->image,mt_rand(100,255),mt_rand(100,255),mt_rand(100,255));
}else{
$this->randBgColor=imagecolorallocate($this->image,$this->bgColor[0],$this->bgColor[1],$this->bgColor[2]);
}
imagefill($this->image,0,0,$this->randBgColor);
}

//@Generate random characters
public function randText($type){
$string='';
switch($type){
case 'en':
$str='ABCDEFGHJKLMNPQRSTUVWXY3456789';
for($i=0;$i<$this->textNum;$i++){
$string=$string.','.$str[mt_rand(0,29)];
}
break;
case 'cn':
for($i=0;$i<$this->textNum;$i++) {
$string=$string.','.chr(rand(0xB0,0xCC)).chr(rand(0xA1,0xBB));
}
$string=iconv('GB2312','UTF-8',$string); //Convert encoding to utf8
break;
}
return substr($string,1);
}

//@Output text to verification code
public function createText(){
$textArray=explode(',',$this->randText($this->textLang));
$this->textContent=join('',$textArray);
if(empty($this->fontColor)){
$this->randFontColor=imagecolorallocate($this->image,mt_rand(0,100),mt_rand(0,100),mt_rand(0,100));
}else{
$this->randFontColor=imagecolorallocate($this->image,$this->fontColor[0],$this->fontColor[1],$this->fontColor[2]);
}
for($i=0;$i<$this->textNum;$i++){
$angle=mt_rand(-1,1)*mt_rand(1,20);
imagettftext($this->image,$this->fontSize,$angle,5+$i*floor($this->fontSize*1.3),floor($this->height*0.75),$this ->randFontColor,$this->fontFamily,$textArray[$i]);
}
}

//@Generate interference points
public function createNoisePoint(){
for($i=0;$i<$this->noisePoint;$i++){
$pointColor=imagecolorallocate($this->image,mt_rand(0,255),mt_rand(0,255),mt_rand(0,255));
imagesetpixel($this->image,mt_rand(0,$this->width),mt_rand(0,$this->height),$pointColor);
}

}

//@Generate interference lines
public function createNoiseLine(){
for($i=0;$i<$this->noiseLine;$i++) {
$lineColor=imagecolorallocate($this->image,mt_rand(0,255),mt_rand(0,255),20);
imageline($this->image,0,mt_rand(0,$this->width),$this->width,mt_rand(0,$this->height),$lineColor);
}
}

//@扭曲文字
public function distortionText(){
$this->distortionImage=imagecreatetruecolor($this->width,$this->height);
imagefill($this->distortionImage,0,0,$this->randBgColor);
for($x=0;$x<$this->width;$x++){
for($y=0;$y<$this->height;$y++){
$rgbColor=imagecolorat($this->image,$x,$y);
imagesetpixel($this->distortionImage,(int)($x+sin($y/$this->height*2*M_PI-M_PI*0.5)*3),$y,$rgbColor);
}
}
$this->image=$this->distortionImage;
}

//@生成验证码图片
public function createImage(){
$this->initImage(); //创建基本图片
$this->createText(); //输出验证码字符
if($this->distortion){$this->distortionText();} //扭曲文字
$this->createNoisePoint(); //产生干扰点
$this->createNoiseLine(); //产生干扰线
if($this->showBorder){imagerectangle($this->image,0,0,$this->width-1,$this->height-1,$this->randFontColor);} //添加边框
imagepng($this->image);
imagedestroy($this->image);
if($this->distortion){imagedestroy($this->$distortionImage);}
return $this->textContent;
}

}
?>使用方法：

//session_start();
header("Content-type:image/png");
include('captcha5_class.php');
$captcha5=new Captcha();

//@设置验证码宽度
//$captcha5->setWidth(200);

//@设置验证码高度
//$captcha5->setHeight(50);

//@设置字符个数
$captcha5->setTextNumber(5);

//@设置字符颜色
//$captcha5->setFontColor('#ff9900');

//@设置字号大小
//$captcha5->setFontSize(25);

//@设置字体
$captcha5->setFontFamily('c:windowsfontsSTXINGKA.TTF');

//@设置语言
$captcha5->setTextLang('cn');

//@设置背景颜色
//$captcha5->setBgColor('#000000');

//@设置干扰点数量
//$captcha5->setNoisePoint(600);

//@设置干扰线数量
//$captcha5->setNoiseLine(10);

//@设置是否扭曲
//$captcha5->setDistortion(true);

//@设置是否显示边框
$captcha5->setShowBorder(true);

//输出验证码
$code=$captcha5->createImage();
//$_SESSION['captchaCode']['content']=$code;
//$_SESSION['captchaCode']['time']=microtime();
?>