初学Php，因为很多地方都涉及到验证码的功能，网上虽然有很多验证码的例子，但是看了之后都不是很满意。于是，自己随便看了一下书，写了一个简单地Php验证码类，可以提供简单的生成一个验证码类。当然，这个类也是刚刚写好，还有很多可以改进的地方。
下面是代码。
<?php
/*
2014/3/28
@程序与算法
*/
class checkCode{
private $m_fontFile = ""; //储存引入的字体文件路径
private $m_fontSize = 16; // 字体大小
private $m_str = ""; //储存生成验证码的字符串
private $m_width = 80; //验证码图片的宽度
private $m_heigh = 30; //验证码图片的高度
private $m_bg = array("0xff", "0xff", "0xff"); //默认的背景颜色
private $m_tg = array("0x00", "0x00", "0x00"); //默认的字体颜色
private $m_ig; //图片变量
private $m_isbg = "";
private $m_istg = "";
private $m_codearray = array(); //动态生成验证码的字符数组，这里是0-9,a-z,A-Z
private $m_codeNum = 4; //验证码的长度
//构造函数，可以传入宽度和高度，也可以使用默认的值
public function __construct($m_w = "", $m_h = "")
{
$this->createCodeArray(); //用于生成随机字符串
if ($m_w == "" || $m_h == "")
{
$this->m_ig = imagecreate($this->m_width, $this->m_heigh);
}
else
{
$this->m_ig = imagecreate($m_w, $m_h);
$this->m_width = $m_w;
$this->m_heigh = $m_h;
}
$this->setBgColor($this->m_bg[0], $this->m_bg[1], $this->m_bg[2]);
}
public function __destruct()
{
imagedestroy($this->m_ig);
}
public function setBgColor($m_r, $m_g, $m_b) //设置验证码的背景颜色
{
$this->m_ig = imagecreate($this->m_width, $this->m_heigh);
$this->m_isbg = imagecolorallocate($this->m_ig, $m_r, $m_g, $m_b);
return $this->m_isbg;
}
public function setTxColor($m_r, $m_g, $m_b) //设置字体颜色
{
$this->m_istg = imagecolorallocate($this->m_ig, $m_r, $m_g, $m_b);
return $this->m_istg;
}
public function setCodeCount($m_num) //设置验证码的长度
{
$this->m_codeNum = $m_num;
}
// 设置验证码的字符串，这个字符串可以是用户自己设置的，也可以是由系统自动生成随机的字符串
public function setCodeStr($str)
{
$this->m_str = $str;
}
public function setCodeFontSize($size) //设置验证码字体的大小
{
$this->m_fontSize = $size;
}
public function setCodeFontFile($file) //设置字体类型，如果不调用这个函数，就使用默认的字体
{
if (file_exists($file))
{
$this->m_fontFile = $file;
}
}
public function createCodeArray() //生成随机字符串的数组
{
$m_aa = ord(‘A‘);
$m_AB = ord(‘a‘);
for ($m_i = 0; $m_i < 36; ++ $m_i)
{
if ($m_i >= 0 && $m_i < 10)
{
array_push($this->m_codearray, $m_i);
}
else
{
$m_temp = chr($m_aa + $m_i - 10);
array_push($this->m_codearray, $m_temp);
$m_temp = chr($m_AB + $m_i - 10);
array_push($this->m_codearray, $m_temp);
}
}
}
public function createMass() //生成杂点
{
$m_line = imagecolorallocate($this->m_ig, 0xdd, 0xdd, 0xdd);
for ($m_i = 0; $m_i < ($this->m_width + $this->m_heigh) / 50; ++ $m_i)
{
$m_fx = rand(0, $this->m_width);
$m_fy = rand(0, $this->m_heigh);
$m_sx = rand(0, $this->m_width);
$m_sy = rand(0, $this->m_heigh);
imageline($this->m_ig, $m_fx, $m_fy, $m_sx, $m_sy, $m_line);
}
$m_point = imagecolorallocate($this->m_ig, 0x00, 0x00, 0x00);
for ($m_i = 0; $m_i < $this->m_width * $this->m_heigh / 50; ++ $m_i)
{
$m_fx = rand(0, $this->m_width);
$m_fy = rand(0, $this->m_heigh);
imagesetpixel($this->m_ig, $m_fx, $m_fy, $m_point);
}
}
private function deutCode() //默认字体生成的验证码图片
{
@$m_arrstr = str_split($this->m_str);
//$this->createMass();
if ($this->m_str == "")
{
for ($m_i = 0; $m_i < $this->m_codeNum; ++ $m_i)
{
$m_index = rand(0, count($this->m_codearray) - 1);
$m_tempx = ($this->m_width / $this->m_codeNum) * ($this->m_codeNum - 1) / $this->m_codeNum;
$m_w = $m_tempx * ($m_i + 1);
$m_dh = $this->m_heigh / 4;
$m_h = rand($m_dh * 0.6, $m_dh * 1.5);
imagestring($this->m_ig, $this->m_fontSize, $m_w, $m_h, $this->m_codearray[$m_index], $this->m_istg);
}
}
else
{
$m_len = count($m_arrstr);
for ($m_i = 0; $m_i < $m_len; ++ $m_i)
{
$m_tempx = ($this->m_width / $m_len) * ($m_len - 1) / $m_len;
$m_w = $m_tempx * ($m_i + 1);
$m_dh = $this->m_heigh / 4;
$m_h = rand($m_dh * 0.6, $m_dh * 1.5);
imagestring($this->m_ig, $this->m_fontSize, $m_w, $m_h, $m_arrstr[$m_i], $this->m_istg);
}
}
imagepng($this->m_ig);
}
private function chgeCode() //新字体生成的验证码图片
{
@$m_arrstr = str_split($this->m_str);
if ($this->m_str == "")
{
for ($m_i = 0; $m_i < $this->m_codeNum; ++ $m_i)
{
$m_index = rand(0, count($this->m_codearray) - 1);
$m_tempx = ($this->m_width / $this->m_codeNum) * ($this->m_codeNum - 1) / $this->m_codeNum;
$m_w = $m_tempx * ($m_i + 1);
$m_h = $this->m_heigh / 1.2;
$m_angel = rand(0, 60);
imagefttext($this->m_ig, $this->m_fontSize, $m_angel, $m_w, $m_h, $this->m_istg, $this->m_fontFile, $this->m_codearray[$m_index]);
}
}
else
{
$m_len = count($m_arrstr);
for ($m_i = 0; $m_i < $m_len; ++ $m_i)
{
$m_tempx = ($this->m_width / $m_len) * ($m_len - 1) / $m_len;
$m_w = $m_tempx * ($m_i + 1);
$m_h = $this->m_heigh / 1.2;
$m_angel = rand(0, 45);
imagefttext($this->m_ig, $this->m_fontSize, $m_angel, $m_w, $m_h, $this->m_istg, $this->m_fontFile, $m_arrstr[$m_i]);
}
}
}
public function getCode() //获取验证码的函数，这个函数就是相当于生成验证码
{
if ($this->m_istg == "")
{
$this->setTxColor($this->m_tg[0], $this->m_tg[1], $this->m_tg[2]);
}
$this->createMass(); //这个函数下面会有说明是一个生成随机杂点的函数
if ($this->m_fontFile == "")
{
$this->deutCode();
}
else
{
$this->chgeCode();
}
imagepng($this->m_ig);
}
}
?>
该类的使用方法一，这是最简单的形式。
1. 首先引入该类
2. 初始化，不想类传递任何参数，全部使用默认、
3. 生成验证码
具体的代码如下
<?php include "checkCode.php";?>
<?php
header("Content-Type:image/png");
$m_code = new checkCode();
$m_code->getCode();
?>
方法二，通过传递参数，生成更加漂亮的验证码。（推荐使用这个方法，因为系统默认的字体不是很清晰而且比较小）
<?php include "checkCode.php";?>
<?php
header("Content-Type:image/png");
$m_code = new checkCode(100, 50); // 或者 $m_code = new checkCode(200, 50);传递宽度和高度
$m_code->setCodeFontFile("Arial.ttf"); //引入新的字体
$m_code->setCodeFontSize(22); //设置字体大小
$m_code->setCodeCount(5); //设置验证码的长度
//背景颜色参数为RGB的分量值， 0-255 使用十六进制 0x00-0xff
$m_code->setBgColor(0xdd, 0xcc, 0xcc);
$m_code->setTxColor(0x00, 0x11, 0x22); //，字体颜色同上
$m_code->getCode();
?>
效果图。
在上述的介绍中，还可以使用一个函数
public function setCodeStr($str)
{
$this->m_str = $str;
}
这个函数用于接收用户传进来的字符串，比如说，$m_code->setCodeStr("12345678");
那么生成的图片里面的字符就是 12345678
其实，在那个生成杂点的函数做的不是很好，可以再次接受用户的输入，来生成杂点。可以让用户来选择设置杂点的颜色，杂店的数量等等。。这些还是需要解决的。由于时间紧促，只能先把这个类实现到这个样子了。