PHP Chinese character verification code generation program (1/3)_PHP tutorial

php Chinese character verification code generation program This PHP Chinese character verification code generation program is actually very simple. Generating Chinese character verification codes requires font support. Below we use arial.ttf to support generation, otherwise the Chinese image verification code will be garbled.

php tutorial Chinese character verification code generation program
This PHP Chinese character verification code generation program is actually very simple. Generating Chinese character verification codes requires font support. Below we use arial.ttf to support generation, otherwise the Chinese image verification code will be garbled.
*/

class securecode
{
Private static $instance=null;
Private $code = '';
private $fontfile;
private $validate;
private $image;
Private $specialadd = 'special string for securecode';
Private $codeexpire=86400;
Private $codecookiename='secure_code';

/**
*Construction method
​​*/
Private function securecode()
{
$this->fontfile = dirname(__file__) . '/arial.ttf';
}

private function __construct()
{
$this->securecode();
}
 
Public static function getinstance()
{
If (self::$instance==null)
              self::$instance=new self();
         
          return self::$instance;
}

/**
* Specify the path to the font file, the default is the arial.ttf file in the current folder
* @param $fontfile file path
* @return void
​​*/
Function loadfont($fontfile)
{
            $this->fontfile = $fontfile;
}

/**
* Image output method, the program should not have any form of output before executing this method
* @return void;
​​*/
Function stroke()
{
$this->savecode();
          self::sendheader();
imagegif( $this->validate );
imagedestroy( $this->validate );
imagedestroy( $this->image );
}

    /**
* How to save pictures
* @param $filename saving path
* @return void
​​*/
    function save($filename)
    {
        $this->savecode();
        imagegif( $this->validate , $filename );
        imagedestroy( $this->validate );
        imagedestroy( $this->image );
    }
   
  /**
* Verification code verification method
* @param $input The string to be verified, that is, the user’s input
* @return boolean verification result
​​*/
    function verify($input)
    {
        $input=strtolower($input);
        $targetcode=$this->authcode($input);
        $code=$this->getcookie();
        if (empty($code)||$code!=$targetcode)
            $result= false;
        else
            $result=true;
        $_cookie[$this->codecookiename]='';
        setcookie ( $this->codecookiename, '', - 1 );
        return $result;
    }

    /**
* How to create images
* @return void;
​​*/
    function createimage()
    {
        $this->randcode();
       
        $size = 30;
        $width = 90;
        $height = 35;
        $degrees = array (
            rand( 0 , 30 ), rand( 0 , 30 ), rand( 0 , 30 ), rand( 0 , 30 )
        );
       

        for ($i = 0; $i < 4; ++$i)
        {
            if (rand() % 2);
            else $degrees[$i] = -$degrees[$i];
        }
       
        $this->image = imagecreatetruecolor( $size , $size );
        $this->validate = imagecreatetruecolor( $width , $height );
        $back = imagecolorallocate( $this->image , 255 , 255 , 255 );
        $border = imagecolorallocate( $this->image , 0 , 0 , 0 );
        imagefilledrectangle( $this->validate , 0 , 0 , $width , $height , $back );
       
        for ($i = 0; $i < 4; ++$i)
        {
            $temp = self::rgbtohsv( rand( 0 , 250 ) , rand( 0 , 150 ) , rand( 0 , 250 ) );
           
            if ($temp[2] > 60) $temp[2] = 60;
           
            $temp = self::hsvtorgb( $temp[0] , $temp[1] , $temp[2] );
            $textcolor[$i] = imagecolorallocate( $this->image , $temp[0] , $temp[1] , $temp[2] );
        }
       
        for ($i = 0; $i < 200; ++$i)
        {
            $randpixelcolor = imagecolorallocate( $this->validate , rand( 0 , 255 ) , rand( 0 , 255 ) , rand( 0 , 255 ) );
            imagesetpixel( $this->validate , rand( 1 , 87 ) , rand( 1 , 35 ) , $randpixelcolor );
        }
       
        $temp = self::rgbtohsv( rand( 220 , 255 ) , rand( 220 , 255 ) , rand( 220 , 255 ) );
       
        if ($temp[2] < 200) $temp[2] = 255;
       
        $temp = self::hsvtorgb( $temp[0] , $temp[1] , $temp[2] );
        $randlinecolor = imagecolorallocate( $this->image , $temp[0] , $temp[1] , $temp[2] );
       
        self::imagelinethick( $this->validate , $textcolor[rand( 0 , 3 )] );
       
        imagefilledrectangle( $this->image , 0 , 0 , $size , $size , $back );
        putenv( 'gdfontpath=' . realpath( '.' ) );
       
        // name the font to be used (note the lack of the .ttf extension
        imagettftext( $this->image , 15 , 0 , 8 , 20 , $textcolor[0] , $this->fontfile , $this->code[0] );
       
        $this->image = imagerotate( $this->image , $degrees[0] , $back );
        imagecolortransparent( $this->image , $back );
        imagecopymerge( $this->validate , $this->image , 1 , 4 , 4 , 5 , imagesx( $this->image ) - 10 , imagesy( $this->image ) - 10 , 100 );
       
        $this->image = imagecreatetruecolor( $size , $size );
        imagefilledrectangle( $this->image , 0 , 0 , $size , $size , $back );
        imagettftext( $this->image , 15 , 0 , 8 , 20 , $textcolor[1] , $this->fontfile , $this->code[1] );
        $this->image = imagerotate( $this->image , $degrees[1] , $back );
        imagecolortransparent( $this->image , $back );
        imagecopymerge( $this->validate , $this->image , 21 , 4 , 4 , 5 , imagesx( $this->image ) - 10 , imagesy( $this->image ) - 10 , 100 );
       
        $this->image = imagecreatetruecolor( $size , $size );
        imagefilledrectangle( $this->image , 0 , 0 , $size - 1 , $size - 1 , $back );
        imagettftext( $this->image , 15 , 0 , 8 , 20 , $textcolor[2] , $this->fontfile , $this->code[2] );
        $this->image = imagerotate( $this->image , $degrees[2] , $back );
        imagecolortransparent( $this->image , $back );
        imagecopymerge( $this->validate , $this->image , 41 , 4 , 4 , 5 , imagesx( $this->image ) - 10 , imagesy( $this->image ) - 10 , 100 );
       
        $this->image = imagecreatetruecolor( $size , $size );
        imagefilledrectangle( $this->image , 0 , 0 , $size - 1 , $size - 1 , $back );
        imagettftext( $this->image , 15 , 0 , 8 , 20 , $textcolor[3] , $this->fontfile , $this->code[3] );
        $this->image = imagerotate( $this->image , $degrees[3] , $back );
        imagecolortransparent( $this->image , $back );
        imagecopymerge( $this->validate , $this->image , 61 , 4 , 4 , 5 , imagesx( $this->image ) - 10 , imagesy( $this->image ) - 10 , 100 );
        imagerectangle( $this->validate , 0 , 0 , $width - 1 , $height - 1 , $border );
    }

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