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php 验证码实例代码 - 站长搜索
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php 验证码实例代码

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2014-12-07 16:18:05 转载来源: 网络整理/侵权必删

本文是一个php 验证码实例代码,感兴趣的同学参考下。 首先验证码的原理就是,画一张图片,然后在这张图片上写一些字,然后加一些干扰的线条,像素点之类的东西就ok了,这里要使用php那就要知道php中画图的函数是那些,然后拿来用便是了

本文是一个php 验证实例代码,感兴趣的同学参考下。

首先验证码的原理就是,画一张图片,然后在这张图片上写一些字,然后加一些干扰的线条,像素点之类的东西就ok了,这里要使用php那就要知道php中画图的函数是那些,然后拿来用便是了。
如果要用php的画图函数,首先要启用这个模块的功能。就是把php.ini中php_gd2.dll前面的注释去掉就好了。

下面开始画图:


<?php
session_start();
//生成验证码图片
Header("Content-type: image/PNG");
$im = imagecreate(44,18); // 画一张指定宽高的图片
$back = ImageColorAllocate($im, 245,245,245); // 定义背景颜色
imagefill($im,0,0,$back); //把背景颜色填充到刚刚画出来的图片中
$vcodes = "";
srand((double)microtime()*1000000);
//生成4位数字
for($i=0;$i<4;$i++){
$font = ImageColorAllocate($im, rand(100,255),rand(0,100),rand(100,255)); // 生成随机颜色
$authnum=rand(1,9);
$vcodes.=$authnum;
imagestring($im, 5, 2+$i*10, 1, $authnum, $font);
}
$_SESSION['VCODE'] = $vcodes;
for($i=0;$i<100;$i++) //加入干扰象素
{
$randcolor = ImageColorallocate($im,rand(0,255),rand(0,255),rand(0,255));
imagesetpixel($im, rand()%70 , rand()%30 , $randcolor); // 画像素点函数
}
ImagePNG($im);
ImageDestroy($im);
?>


基本就是这样实现了,其实如果给图片打水印也无非就是往图片里面写字,原理都差不多的。


使用方法:
<img src="xxx.php" /> 填写这个php文件的名字,就可以使用了。


标签: php 验证 实例 代码


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