php验证码 怎么弄
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[解决办法]
随机选取数字或字母再以图片形式显示出来就行啦
[解决办法]
1、假如你的是login.php页面:在此页面下,
<?php
include ("conn.php"); //这个是连接Mysql的
session_start();
echo $_SESSION[check_pic];
if ($_POST) {
$code=$_POST[code];
if($code!=$_SESSION[check_pic])
echo "<script>alert('验证码有误!');location.href='login.php';</script>";
}
?>
<form id="form1" name="form1" method="post" action="" >
<input name="code" type="text" id="code" size="8" /> <img src="inc/vCode.php" alt="验证码" width="55" height="30" align="absmiddle" style="cursor:pointer" onclick="javascript:this.src='inc/vCode.php?tm='+Math.random()" />
<input type="submit" name="button" id="button" value="提交" />
</form>
2、src='inc/vCode.php?tm='+Math.random()中的inc/vCode.php,是指当前目录下的inc文件夹下,要放个vCode.php,你新建个vCode.php,代码如下,你粘贴即可:
<?php
/*
* 放一个font.ttc字体到目录下
$num 字符个数
$size 字符大小
颜色随机
*/
// vCode ********
function vCode($num = 4, $size = 20, $width = 0, $height = 0) {
session_start();
!$width && $width = $num * $size * 4 / 5 + 5;
!$height && $height = $size +10;
// 去掉了 0 1 O l 等
$str = "23456789abcdefghijkmnpqrstuvwxyzABCDEFGHIJKLMNPQRSTUVW";
$code = '';
for ($i = 0; $i < $num; $i++) {
$code .= $str[mt_rand(0, strlen($str) - 1)];
}
$_SESSION[check_pic]=$code;
// 画图像
$im = imagecreatetruecolor($width, $height);
// 定义要用到的颜色
$back_color = imagecolorallocate($im, 235, 236, 237);
$boer_color = imagecolorallocate($im, 118, 151, 199);
$text_color = imagecolorallocate($im, mt_rand(0, 200), mt_rand(0, 120), mt_rand(0, 120));
// 画背景
imagefilledrectangle($im, 0, 0, $width, $height, $back_color);
// 画边框
imagerectangle($im, 0, 0, $width -1, $height -1, $boer_color);
// 画干扰线
for ($i = 0; $i < 5; $i++) {
$font_color = imagecolorallocate($im, mt_rand(0, 255), mt_rand(0, 255), mt_rand(0, 255));
imagearc($im, mt_rand(- $width, $width), mt_rand(- $height, $height), mt_rand(30, $width * 2), mt_rand(20, $height * 2), mt_rand(0, 360), mt_rand(0, 360), $font_color);
}
// 画干扰点
for ($i = 0; $i < 50; $i++) {
$font_color = imagecolorallocate($im, mt_rand(0, 255), mt_rand(0, 255), mt_rand(0, 255));
imagesetpixel($im, mt_rand(0, $width), mt_rand(0, $height), $font_color);
}
// 画验证码
imagefttext($im, $size, 0, 5, $size +3, $text_color, 'simkai.ttf', $code);
header("Cache-Control: max-age=1, s-maxage=1, no-cache, must-revalidate");
header("Content-type: image/png");
imagepng($im);
imagedestroy($im);
}
vCode(4, 20);
// 4个字符,大小为20
//调用方法:<img src="inc/vcode.php" />
?>