初學Php，因為很多地方都涉及到驗證碼的功能，網上雖然有很多驗證碼的例子，但是看了之后都不是很滿意。于是，自己隨便看了一下書，寫了一個簡單地Php驗證碼類，可以提供簡單的生成一個驗證碼類。當然，這個類也是剛剛寫好，還有很多可以改進的地方。

下面是代碼。

<?php/*	2014/3/28	@程序與算法*/html' target='_blank'>class checkCode{	private $m_fontFile = "";  //儲存引入的字體文件路徑	private $m_fontSize = 16;  // 字體大小	private $m_str = "";  //儲存生成驗證碼的字符串	private $m_width = 80; //驗證碼圖片的寬度	private $m_heigh =  30; //驗證碼圖片的高度	private $m_bg = array("0xff", "0xff", "0xff");  //默認的背景顏色	private $m_tg = array("0x00", "0x00", "0x00");   //默認的字體顏色	private $m_ig;  //圖片變量	private $m_isbg = "";	private $m_istg = "";	private $m_codearray = array();  //動態生成驗證碼的字符數組，這里是0-9,a-z,A-Z	private $m_codeNum = 4; //驗證碼的長度		//構造函數，可以傳入寬度和高度，也可以使用默認的值	public function __construct($m_w = "", $m_h = "") 	{		$this->createCodeArray();  //用于生成隨機字符串		if ($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)  //設置驗證碼的背景顏色	{		$this->m_ig = imagecreate($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)  //設置字體顏色	{		$this->m_istg = imagecolorallocate($this->m_ig, $m_r, $m_g, $m_b);		return $this->m_istg;	}	public function setCodeCount($m_num) //設置驗證碼的長度	{		$this->m_codeNum = $m_num;	}	// 設置驗證碼的字符串，這個字符串可以是用戶自己設置的，也可以是由系統自動生成隨機的字符串	public function setCodeStr($str)  	{		$this->m_str = $str;	}	public function setCodeFontSize($size) //設置驗證碼字體的大小	{		$this->m_fontSize = $size;	}	public function setCodeFontFile($file) //設置字體類型，如果不調用這個函數，就使用默認的字體	{		if (file_exists($file))		{			$this->m_fontFile = $file;		}	}	public function createCodeArray()  //生成隨機字符串的數組	{		$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()  //生成雜點	{		$m_line = imagecolorallocate($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, $m_point);		}	}	private function deutCode()  //默認字體生成的驗證碼圖片	{		@$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()  //新字體生成的驗證碼圖片	{		@$m_arrstr = str_split($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()  //獲取驗證碼的函數，這個函數就是相當于生成驗證碼	{		if ($this->m_istg == "")		{			$this->setTxColor($this->m_tg[0], $this->m_tg[1], $this->m_tg[2]);		}		$this->createMass();   //這個函數下面會有說明是一個生成隨機雜點的函數		if ($this->m_fontFile == "")		{			$this->deutCode();		}		else		{			$this->chgeCode();		}		imagepng($this->m_ig);	}}?>

該類的使用方法一，這是最簡單的形式。

1. 首先引入該類

2. 初始化，不想類傳遞任何參數，全部使用默認、

3. 生成驗證碼

具體的代碼如下

<?php include "checkCode.php";?><?php	header("Content-Type:image/png");	$m_code = new checkCode();	$m_code->getCode();?>

<?php include "checkCode.php";?><?php	header("Content-Type:image/png");	$m_code = new checkCode(100, 50); // 或者 $m_code = new checkCode(200, 50);傳遞寬度和高度	$m_code->setCodeFontFile("Arial.ttf"); //引入新的字體	$m_code->setCodeFontSize(22);  //設置字體大小	$m_code->setCodeCount(5);  //設置驗證碼的長度	//背景顏色參數為RGB的分量值， 0-255 使用十六進制 0x00-0xff	$m_code->setBgColor(0xdd, 0xcc, 0xcc);  	$m_code->setTxColor(0x00, 0x11, 0x22);  //，字體顏色同上	$m_code->getCode();?>

在上述的介紹中，還可以使用一個函數

public function setCodeStr($str)
{
$this->m_str = $str;
}

這個函數用于接收用戶傳進來的字符串，比如說，$m_code->setCodeStr("12345678");

那么生成的圖片里面的字符就是 12345678

其實，在那個生成雜點的函數做的不是很好，可以再次接受用戶的輸入，來生成雜點?？梢宰層脩魜磉x擇設置雜點的顏色，雜店的數量等等。。這些還是需要解決的。由于時間緊促，只能先把這個類實現到這個樣子了。

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