文件名：原来为validationcode.php
修改为validate.php后可以正常显示验证码，
浏览器中请求code.php文件中进行显示验证码
width = $width; $this->height = $height; $this->num_chars = $num_chars; } function showimage(){ $this->createimage(); $this->drawborder(); $this->drawchars(); $this->outpic(); } //create canvas function createimage(){ $this->image = imagecreate($this->width,$this->height); //$rand_color = imagecolorallocate($this->image,rand(0,255),rand(0,255),rand(0,255)); $back = imagecolorallocate($this->image,0,0,0); $border = imagecolorallocate($this->image,255,255,255); imagefill($this->image,0,0,$back); //imagefilledrectangle($thid->image,self::border,self::border,$this->width-self::border,$this->height-self::border,$border); //imageline($this->image,1,1,100,100,$rand_color); //$this->outpic(); } //draw border private function drawborder(){ $outer_bg_color = imagecolorallocate($this->image,0,0,0); $inner_bg_color = imagecolorallocate($this->image,255,255,255); imagefill($this->image,0,0,$outer_bg_color); imagefilledrectangle($this->image,self::border,self::border,$this->width-self::border-1,$this->height-self::border-1,$inner_bg_color); } //create char content function createchar(){ $rand_ascii=; $rand_type = rand(0,2); switch($rand_type){ case 0: $rand_ascii = rand(48,57); break; case 1: $rand_ascii = rand(65,90); break; case 2: $rand_ascii = rand(97,122); break; } $rand_str = sprintf(%c,$rand_ascii); return $rand_str; } //draw char private function drawchars(){ $x = $this->width/$this->num_chars+1; $y = $this->height/2; for($index = 0; $indexnum_chars; $index++){ $rand_color = imagecolorallocate($this->image,rand(0,255),rand(0,255),rand(0,255)); imagechar($this->image,3,$x*$index+2,$y-$y/2,$this->createchar(),$rand_color); } } //out pic private function outpic(){ header(content-type:image/png); imagepng($this->image); } function __destruct(){ imagedestroy($this->image); } } /*$code = new validationcode(); //echo $code->createchar(); $code->showimage();*/?>

code.php
createchar(); $code->showimage(); ?>

这个问题已被关闭，原因：已经自己找到问题原因
回复内容： 文件名：原来为validationcode.php
修改为validate.php后可以正常显示验证码，
浏览器中请求code.php文件中进行显示验证码
width = $width; $this->height = $height; $this->num_chars = $num_chars; } function showimage(){ $this->createimage(); $this->drawborder(); $this->drawchars(); $this->outpic(); } //create canvas function createimage(){ $this->image = imagecreate($this->width,$this->height); //$rand_color = imagecolorallocate($this->image,rand(0,255),rand(0,255),rand(0,255)); $back = imagecolorallocate($this->image,0,0,0); $border = imagecolorallocate($this->image,255,255,255); imagefill($this->image,0,0,$back); //imagefilledrectangle($thid->image,self::border,self::border,$this->width-self::border,$this->height-self::border,$border); //imageline($this->image,1,1,100,100,$rand_color); //$this->outpic(); } //draw border private function drawborder(){ $outer_bg_color = imagecolorallocate($this->image,0,0,0); $inner_bg_color = imagecolorallocate($this->image,255,255,255); imagefill($this->image,0,0,$outer_bg_color); imagefilledrectangle($this->image,self::border,self::border,$this->width-self::border-1,$this->height-self::border-1,$inner_bg_color); } //create char content function createchar(){ $rand_ascii=; $rand_type = rand(0,2); switch($rand_type){ case 0: $rand_ascii = rand(48,57); break; case 1: $rand_ascii = rand(65,90); break; case 2: $rand_ascii = rand(97,122); break; } $rand_str = sprintf(%c,$rand_ascii); return $rand_str; } //draw char private function drawchars(){ $x = $this->width/$this->num_chars+1; $y = $this->height/2; for($index = 0; $indexnum_chars; $index++){ $rand_color = imagecolorallocate($this->image,rand(0,255),rand(0,255),rand(0,255)); imagechar($this->image,3,$x*$index+2,$y-$y/2,$this->createchar(),$rand_color); } } //out pic private function outpic(){ header(content-type:image/png); imagepng($this->image); } function __destruct(){ imagedestroy($this->image); } } /*$code = new validationcode(); //echo $code->createchar(); $code->showimage();*/?>

code.php
createchar(); $code->showimage(); ?>

测试：入口代码
createchar();$code->showimage();
文件名：
测试结果：
结论：include的时候文件名跟类名没有关系。结果是可以的。我不知道你的为什么不可以。但是我测了是可以的。
真的假的啊！文件名和类名一样引用不起作用，这么神奇！有没有出什么错误提示