Image verification code generation application example_PHP tutorial

A simple PHP program to generate graphic verification codes. The example tells you how to use this verification program. You can refer to it if you need it.

The code is as follows

代码如下	复制代码
session_start();//开启session if(isset($_POST['check'])) { if($_POST['check']) { if($_POST['check']==$_SESSION['check_pic']) { echo " 验证码正确".$_SESSION['check_pic']; } else { echo " 验证码错误".$_SESSION['check_pic']; } } } ?>

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代码如下	复制代码
session_start(); for($i=0;$i<4;$i++) //四位验证码 {@$rand.=dechex(rand(1,15));//先生成随机数，再将十进制转十六进制，注意"." } $_SESSION['check_pic']=$rand; $im=imagecreatetruecolor(100,30);//创建图片 $bg=imagecolorallocate($im,0,0,0);//设置颜色 $wh=imagecolorallocate($im,255,255,255); imagestring($im,5,15,8,$rand,$wh);//字体，1-6 header("Content-type: image/jpeg");//输出图片 imagejpeg($im); ?>

session_start();//Open session
if(isset($_POST['check']))
{
if($_POST['check'])
{
if($_POST['check']==$_SESSION['check_pic'])
{
echo "Verification code is correct".$_SESSION['check_pic'];
}
else
{
echo "Verification code error".$_SESSION['check_pic'];
}
}
}
?>

index.php verification code generation program

The code is as follows

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session_start(); for($i=0;$i<4;$i++) //Four-digit verification code {@$rand.=dechex(rand(1,15));//Generate random numbers first, then convert decimal to hexadecimal, pay attention to "." } $_SESSION['check_pic']=$rand; $im=imagecreatetruecolor(100,30);//Create image $bg=imagecolorallocate($im,0,0,0);//Set color $wh=imagecolorallocate($im,255,255,255); imagestring($im,5,15,8,$rand,$wh);//Font, 1-6 header("Content-type: image/jpeg");//Output image imagejpeg($im); ?> http://www.bkjia.com/PHPjc/631328.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/631328.htmlTechArticleA simple PHP program to generate graphic verification codes. The example tells you how to use this verification program. There are You can refer to it if needed. The code is as follows Copy code ?php tutorial session_...