PHP简单生成验证码文件的类,在这个类中可定义生成验证码图片的字符数、干扰像素,设置验证码最终的高度和宽度,还有很多参数设置就不一一说明了,看代码:
<?php class CCheckCodeFile { private $mCheckCodeNum = 4;//验证码位数 private $mCheckCode = '';//产生的验证码 private $mCheckImage = &#39;&#39;;//验证码的图片 private $mDisturbColor = '';//干扰像素 private $mCheckImageWidth = &#39;80&#39;;//验证码的图片宽度 private $mCheckImageHeight = '20';//验证码的图片宽度 /@brief 输出头/ private function OutFileHeader() { header ("Content-type: image/png"); } /产生验证码/ private function CreateCheckCode() { $this-&gt;mCheckCode = strtoupper(substr(md5(rand()),0,$this->mCheckCodeNum)); return $this-&gt;mCheckCode; } //@brief 产生验证码图片 private function CreateImage() { $this->mCheckImage = @imagecreate ($this-&gt;mCheckImageWidth,$this->mCheckImageHeight); imagecolorallocate ($this-&gt;mCheckImage, 200, 200, 200); return $this->mCheckImage; } //@brief 设置图片的干扰像素 private function SetDisturbColor() { for ($i=0;$i<=128;$i++) { $this->mDisturbColor = imagecolorallocate ($this-&gt;mCheckImage, rand(0,255), rand(0,255), rand(0,255)); imagesetpixel($this->mCheckImage,rand(2,128),rand(2,38),$this-&gt;mDisturbColor); } } /** * @brief 设置验证码图片的大小 * @param $width 宽  @param $height 高 */ public function SetCheckImageWH($width,$height) { if($width==''||$height==&#39;&#39;)return false; $this->mCheckImageWidth = $width; $this->mCheckImageHeight = $height; return true; } //@brief 在验证码图片上逐个画上验证码 private function WriteCheckCodeToImage() { for ($i=0;$i&lt;=$this->mCheckCodeNum;$i++) { $bg_color = imagecolorallocate ($this-&gt;mCheckImage, rand(0,255), rand(0,128), rand(0,255)); $x = floor($this-&gt;mCheckImageWidth/$this->mCheckCodeNum)$i; $y = rand(0,$this-&gt;mCheckImageHeight-15); imagechar ($this->mCheckImage, 5, $x, $y, $this-&gt;mCheckCode[$i], $bg_color); } } //@brief 输出验证码图片 public function OutCheckImage() { $this ->OutFileHeader(); $this -&gt;CreateCheckCode(); $this ->CreateImage(); $this -&gt;SetDisturbColor(); $this ->WriteCheckCodeToImage(); imagepng($this-&gt;mCheckImage); imagedestroy($this->mCheckImage); } } ?>
如何使用?
$c_check_code_image = new CCheckCodeFile(); //$c_check_code_image ->SetCheckImageWH(100,50);//设置显示验证码图片的尺寸 $c_check_code_image ->OutCheckImage();
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