<?php class verificationCode{ private $image; private $width; private $height; private $pixersum; //干扰点的数目 private $codenum;//验证字符数目 private $codes;//字符 function __construct($width="100", $height="50", $codenum="4"){ $this->width=$width; $this->height=$height; $this->codenum=$codenum; $this->codes=$this->strings(); $this->image=imagecreatetruecolor($this->width, $this->height); $this->pixersum=floor($width*$height/50); } function showCode(){ //画布颜色 $this->bulidcolor(); //画干扰素 $this->bulidgrs(); //画字符 $this->bulidzifu(); //输出并销毁 $this->show(); } function tocode(){ return $this->codes; } private function bulidcolor(){ //背景颜色 $red=rand(220, 255); $green=rand(220, 255); $bule=rand(220, 255); $color=imagecolorallocate($this->image, $red, $green, $bule); imagefill($this->image, 0, 0, $color); //黑色边框 imagerectangle($this->image, 0, 0, $this->width-1, $this->height-1, imagecolorallocate($this->image, 0, 0, 0)); } private function bulidgrs(){ //画点 for($i=0; $i<$this->pixersum; $i++){ $color=imagecolorallocate($this->image, rand(0, 255), rand(0, 255), rand(0, 255)); imagesetpixel($this->image, rand(1, $this->width-2), rand(1, $this->height-2), $color); } //画弧线 for($i=0; $i<15; $i++){ $color=imagecolorallocate($this->image, rand(0, 255), rand(0, 255), rand(0, 255)); imagearc($this->image, rand(-10, $this->width), rand(-10, $this->height), rand(10, $this->width), rand(10, $this->height), rand(-30, 30), rand(-30, 30), $color); } } private function strings(){ $str="1234567890abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"; $strs=""; for($i=0; $i<$this->codenum; $i++){ $cha=$str{rand(0, strlen($str))}; $strs.=$cha; } return $strs; } private function bulidzifu(){ for($i=0; $i<$this->codenum; $i++){ $fontcolor=imagecolorallocate($this->image, rand(0, 128), rand(0, 128), rand(0, 128)); $fontsize=rand(4, 5); $x=floor($this->width/$this->codenum)*$i+3; $y=rand(0, $this->height-15); imagechar($this->image, $fontsize, $x, $y, $this->codes{$i},$fontcolor); } } private function show(){ header("Content-Type:image/gif"); imagegif($this->image); imagedestroy($this->image); } } ?>
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