本文分享一个不错的php 验证码类,后面附有完整的调用示例,有需要的朋友,参考下吧。
1,php验证码类
检查验证码:
检查输入的验证码与 $_SESSION['login'] 中保存的值是否相等。
*/
error_reporting(E_ALL);
session_start();
(!isset($_GET['cap']))?die('Error !'):1;
$captcha_array=array('login.png','contact.png','comment.png');
(!in_array($_GET['cap'],$captcha_array))?die('Error !'):1;
$captcha_cod=new captcha(basename($_GET['cap'],'.png')) ;
//验证码类
class captcha
{
private $session_name;
private $image_width;
private $image_height;
private $cod_length;
private $cod_mode;
private $font_path;
private $avtage_font_size;
private $sec_cod;
private $res_image;
function __construct($name,$width=200,$height=50,$length=5,$mod=2,$font='arial.ttf',$av_font_size=25)
{
$this-> session_name = $name ;
$this-> image_width = $width ;
$this-> image_height = $height ;
$this-> cod_length = $length ;
$this-> mode = $mod ;
$this-> font_path = $font ;
$this-> avrage_font_size = $av_font_size ;
$this->Gen_Cod();
}
function Write_Text($text)
{
$x_pos=10;
for($pos=0;$posres_image,rand($this->avrage_font_size -2,$this->avrage_font_size +2),
rand(-40,+40),$x_pos,rand(35,$this->image_height - $this->avrage_font_size),
imagecolorallocate($this->res_image,rand(0,150),rand(0,150),rand(0,150)),
$this->font_path,$text[$pos]);
$x_pos+=($this->image_width/$this->cod_length);
}
}
function Draw_Line()
{
//
for($pos=0;$posimage_height;$pos+=8)
imageline($this->res_image,0,$pos,$this->image_width,$pos,imagecolorallocate($this->res_image,rand(200,230),rand(200,230),rand(200,230)));
//
for($pos=0;$posimage_width;$pos+=8)
imageline($this->res_image,$pos,0,$pos,$this->image_height,imagecolorallocate($this->res_image,rand(200,230),rand(200,230),rand(200,230)));
}
function Gen_Cod()
{
//generate rand cod :
//mode:1 => 0-9 , mode:2 => 0-9 , a-z
($this->mode==1) ? $this->sec_cod=substr((string)rand(1000000000,9999999999),0,$this->cod_length) :
$this->sec_cod=substr(md5(rand(1000000000,9999999999)),0,$this->cod_length);
//set session :
$_SESSION[$this->session_name] = $this->sec_cod ;
//creat image :
$this->res_image=imagecreatetruecolor( $this->image_width , $this->image_height );
//fill color:
imagefilledrectangle($this->res_image,0,0,$this->image_width,$this->image_height,imagecolorallocate($this->res_image,255,255,255));
//write text :
$this->Write_Text($this->sec_cod);
//draw line :
$this->Draw_Line();
//output :
imagejpeg($this->res_image);
header('content-type:image/jpeg');
//destroy:
imagedestroy($this->res_image);
}
}
2,php验证码类的调用示例:
';
else echo'Your Entered Cod Was Incorrect ';
}
?>
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