验证码的一个类，怎么就是不出来图片呢
自己闲着没事，自定义了一个验证码生成的类，但是不知道为什么，图片就是现实不出来。还请高手指点一下。
<br><?php <br />class imageCode{<br> public $img_width; //验证码宽度<br> public $img_height; //高度<br> public $arr_char = array(); //验证码上显示的字符<br> public $font_size; //字体大小<br> public $img; //验证码图片<br> public $code_result; //要保存在session中的数或者字符串<br> public $line_count = 7; //噪音线数量<br> private $str_chars = "0123456789abcdefghjkmnpqrstuvwxyzABCEDFGHJKLMNPQRSTUVWXYZ";//验证码字符串<br> <br> //构造函数<br> function __construct($img_width,$img_height,$font_size,$line_count){ <br> $this->img_width = $img_width;<br> $this->img_height = $img_height;<br> $this->font_size = $font_size;<br> $this->line_count = $line_count;<br> }<br> <br> //验证码生成主方法<br> function createCodeImg(){<br> $this->createGraphics(); <br> $this->getChars();<br> $this->setNoiceLine();<br> <br> $x = rand(2,5);<br> $arr_X_Y = array(array($x,rand(1,3)),array($x+$this->font_size,rand(1,4)),array($x+2*$this->font_size,rand(1,3)),array($x+3*$this->font_size,rand(1,4)));<br> print_r($arr_X_Y);<br> for($i = 0;$i $text_color = imagecolorallocate($this->img, rand(180,250), rand(180,250), rand(180,250));<br> imagechar($this->img,$this->font_size,$arr_X_Y[$i][0],$arr_X_Y[$i][1],$this->arr_char[$i],$text_color); <br> }<br> }<br><br> //创建画图板 <br> function createGraphics(){<br> header("Content-type: image/png"); <br> $this->img = @imagecreatetruecolor($this->img_width, $this->img_height) or die("建立图像失败"); //创建图片<br> $background_color = imagecolorallocate($this->img, 250, 250, 250);<br> imagefill($this->img,0,0,$background_color);<br> $border_color = imagecolorallocate($this->img,0,0,0); //边框色<br> imagerectangle($this->img,0,0,$this->img_width,$this->img_height,$border_color);<br> }<br> <br> //画噪音线<br> function setNoiceLine(){<br> for($i = 0;$i line_count;$i ++){<br> $x1 = rand(3,20);//开始位置<br> $y1 = rand(2,$this->img_height);<br> $x2 = rand($this->img_width-20,$this->img_width-2);//结束位置<br> $y2 = rand(2,$this->img_height);<br> $line_color = imagecolorallocate($this->img, rand(180,250), rand(180,250), rand(180,250));<br> imageline($this->img,$x1,$y1,$x2,$y2,$line_color); <br> }<br> }<br><br> //产生随机字符串或者加减字符 <br> function getChars(){<br> $strCode = "";<br> if(rand(0,1) == 1){//字符串类型的 验证码<br> for($i = 0;$i $this->arr_char[$i] = $this->str_chars[rand(0,56)];<br> $strCode .= $this->arr_char[$i];<br> }<br> $this->code_result = $strCode;<br> }<br> else{ //加减类型验证码<br> $first_num = rand(1,10);<br> $second_num = 0;<br> $result = 0;<br> $arr_operater = array("+","-");<br> $operater = $arr_operater[rand(0,1)];<br> switch ($operater){<br> case "+":<br> $second_num = rand(0,10);<br> $result = $first_num + $second_num;<br> break;<br> case "-":<br> $second_num = rand(0,$first_num);<br> $result = $first_num - $second_num;<br> break;<br> }<br> $this->arr_char = array($first_num,$operater,$second_num,"=");<div class="clear">
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