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How to implement login verification code verification function in PHP
How to implement login verification code verification function in PHP
This article mainly introduces the verification code verification function of PHP in detail, which has certain reference value. Interested friends can refer to it
The verification code is verified using PHP. SESSION function to achieve.
Declare the function session_start(); at the top to tell the server that we want to use this function.
session_start();
The next thing we use is the code to implement the verification code. Here we use English numeric codes as an example.
$image = imagecreatetruecolor(100, 30); //创建一个100×30的画布 $white = imagecolorallocate($image,255,255,255);//白色 imagefill($image,0,0,$white);//覆盖黑色画布
Then declare an empty variable before the verification code is implemented to store the verification code.
$session = ""; //空变量 ，存放验证码
for($i=0;$i<4;$i++){
$size = 6;
$x = $i*25+mt_rand(5,10);
$y = mt_rand(5,10);
$sizi_color = imagecolorallocate($image,mt_rand(80,220),mt_rand(80,220),mt_rand(80,220));
$char = join("",array_merge(range('a','z'),range('A','Z'),range(0,9)));
$char = str_shuffle($char);
$char = substr($char,0,1);
imagestring($image,$size,$x,$y,$char,$sizi_color);
$session .= $char ; //把验证码的每一个值赋值给变量
}
$_SESSION['session'] = $session; //这个变量的值与用户输入的值相等
##
for($k=0;$k<200;$k++){
$rand_color = imagecolorallocate($image,mt_rand(50,200),mt_rand(50,200),mt_rand(50,200));
imagesetpixel($image,mt_rand(1,99),mt_rand(1,29),$rand_color);
}
for($n=0;$n<5;$n++){
$line_color = imagecolorallocate($image,mt_rand(80,220),mt_rand(80,220),mt_rand(80,220));
imageline($image,mt_rand(1,99),mt_rand(1,29),mt_rand(1,99),mt_rand(1,29),$line_color);
}
header('content-type:image/png');//设置文件输出格式
imagepng( $image ); //以png格式输出$image图像
imagedestroy( $image ); //销毁图像if(isset($_POST['session'])){
session_start();
if(strtolower($_POST['session'])==strtolower($_SESSION['session'])){
echo'<font color="#0000CC">输入正确</form>';
}else{
echo '<font color="#CC0000"><b>输入错误</b></font>';
}
exit();
}<!DOCTYPE html> <html> <head> <meta charset="utf-8"/> <title>确认验证码</title> </head> <body> <form method="post" action="./tushu.php"> <p>验证码图片:<img id="img" border="1" src="http://localhost//xxx.php" width="100" height="30"></p> <a href="javascript:void(0)" rel="external nofollow" onclick="document.getElementById('img').src='http://localhost//xxx.php'">看不清？换一个</a> <p>请输入图片中的验证码：<input type="text" name="session" value=""/></p> <p><input type="submit" value="提交" style="padding:6px 10px;"></p> </form> </body> </html>
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The above is the detailed content of How to implement login verification code verification function in PHP. For more information, please follow other related articles on the PHP Chinese website!
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