时间:2021-07-01 10:21:17 帮助过:4人阅读
本文实例讲述了php实现的简单中文验证码功能。分享给大家供大家参考,具体如下:
img.php
<?php session_start(); /*for($i=0;$i<4;$i++) { $rand .= dechex(rand(1,15)); } $_SESSION[check_pic] = $rand; */ $image = imagecreatetruecolor(100, 30); $bg = imagecolorallocate($image, 0, 0, 0); $color = imagecolorallocate($image, 255, 255, 255); //imagestring($image, rand(1,6), rand(3,60), rand(3,15), $rand, $color); for($i=0;$i<3;$i++) { $color2 = imagecolorallocate($image, rand(0,255), rand(0,255),rand(0,255)); imageline($image, rand(0,100), 0, 100, 30, $color2); } //rand() ---->0-max 不大于100 for($i=0;$i<200;$i++) { imagesetpixel($image, rand()%100, rand()%30, $color2); } //$str = iconv("gbk", "utf-8", "中"); $str = "中国"; $_SESSION[check_pic] = $str; //解决中文,页面本身为utf-8 $str = mb_convert_encoding($str, "html-entities","utf-8" ); //2:字体大小 3:倾斜角度 x , y 坐标 imagettftext($image, 12, 0, 20, 20, $color, 'MSYH.TTF', $str); //输出图片 header("Content-type: image/jpeg;charset=utf-8"); imagejpeg($image); /*修改eclipse的配置,可以使得eclipse的新建项目的默认编码直接为UTF-8 在菜单栏的 Window->Preferences->General->Workspace->Text file encoding 将其改为UFT-8即可。*/ ?>
sub.php
<?php header("Content-type: text/html;charset=utf-8"); session_start(); 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]; } } ?> <form action="" method="post"> <img alt="" src="img.php"><br/> <input type="text" name="check"><br/> <input type="submit" value="提交"> </form>
运行效果图如下:
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