php verification code class php verification code-PHP Tutorial-php.cn

php verification code class php verification code

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Release： 2016-07-25 09:04:21

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/**
* Universal verification code class img.php
* Version: V0.1
* bbs.it-home.org 2013/3/1
*/
class ValidateCode {
private $charset="abcdefghizklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890"; //Random factor
private $code; //Verification code text
codelen= 4; //Verification code displays several words
private $width=130; //Verification code width
private $height=50; //Verification code height
private $img; //Verification code resource handle
private $font; //Specified font
private $fontsize=20; //Specified font size
private $fontcolor; //Random font color
//Construction class to write font
public function __construct(){
$this->font =ROOT_PATH.'/font/elephant.ttf';
}
//Create 4 random codes
private function createCode(){
$_leng=strlen($this->charset);
for($i=1 ;$icodelen;$i++){
$this->code.=$this->charset[mt_rand(0,$_leng)];
}
return $this-> code;
}
//Create a background
private function createBg(){
//Create a canvas for a resource jubing
$this->img=imagecreatetruecolor($this->width,$this->height) ;
//Background color
$color=imagecolorallocate($this->img,mt_rand(157,255),mt_rand(157,255),mt_rand(157,255));
//Draw a rectangle
imagefilledrectangle($this-> img,0,$this->height,$this->width,0,$color);
}
//Create font
private function createFont(){
$_x=($this->width / $this->codelen); //Font length
for ($i=0;$icodelen;$i++){
//Text color
$color=imagecolorallocate($this-> ;img,mt_rand(0,156),mt_rand(0,156),mt_rand(0,156));
//Resource handle font size tilt font length font height font color font specific text
imagettftext($this->img,$this- >fontsize,mt_rand(-30,30),$_x*$i+mt_rand(1,5),$this->height/1.4,$color,$this->font,$this->code [$i]);
}
}
//Random lines
private function createLine(){
//Random lines
for ($i=0;$i $color = imagecolorallocate( $this->img,mt_rand(0,156),mt_rand(0,156),mt_rand(0,156));
imageline($this->img,mt_rand(0,$this->width),mt_rand(0,$ this->height),mt_rand(0,$this->width),mt_rand(0,$this->height),$color);
}
//Random snowflakes
for ($i=0; $i $color = imagecolorallocate($this->img,mt_rand(220,255),mt_rand(220,255),mt_rand(220,255));
imagestring($this->img,mt_rand( 1,5),mt_rand(0,$this->width),mt_rand(0,$this->height),'*',$color);
}
}
//Output background
private function outPut (){
//Generate header
header('ContentType:img/png');
//Output image
imagepng($this->img);
//Destroy the result set
imagedestroy($this-> ;img);
}
//External output
public function doimg(){
//Load background
$this->createBg();
//Load file
$this->createCode();
/ /Load line
$this->createLine();
//Load font
$this->createFont();
//Load background
$this->outPut();
}
//Get Verification code
public function getCode(){
return strtolower($this->code);
}
}
?>

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