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【PHP】验证码

作者:培政 / 发布于2015/7/22/ 510

验证码在WEB应用中非常重要,通常用来防止用户恶意提交表单,如恶意注册和登录、论坛恶意灌水等。自己可以导入字体，可以按照自己的额需要随便修改。


	<span style="font-size:14px;"><?php
	 class Imagecode{
	 private $width ;
	 private $height;
	 private $counts;
	 private $distrubcode;
	 private $fonturl;
	 private $session;
	 function __construct($width = 120,$height = 30,$counts = 5,$distrubcode="1235467890qwertyuipkjhgfdaszxcvbnm",$fonturl="C:\Windows\Fonts\TektonPro-BoldCond.otf"){
	 $this->width=$width;
	 $this->height=$height;
	 $this->counts=$counts;
	 $this->distrubcode=$distrubcode;
	 $this->fonturl=$fonturl;
	 $this->session=$this->sessioncode();
	 session_start();
	 $_SESSION['code']=$this->session;
	 }
	
	 function imageout(){
	 $im=$this->createimagesource();
	 $this->setbackgroundcolor($im);
	 $this->set_code($im);
	 $this->setdistrubecode($im);
	 ImageGIF($im);
	 ImageDestroy($im);
	 }
	
	 private function createimagesource(){
	 return imagecreate($this->width,$this->height);
	 }
	 private function setbackgroundcolor($im){
	 $bgcolor = ImageColorAllocate($im, rand(200,255),rand(200,255),rand(200,255));//&plusmn;&sup3;&frac34;&deg;&Ntilde;&Otilde;&Eacute;&laquo;
	 imagefill($im,0,0,$bgcolor);
	 }
	 private function setdistrubecode($im){
	 $count_h=$this->height;
	 $cou=floor($count_h*2);
	 for($i=0;$i<$cou;$i++){
	 $x=rand(0,$this->width);
	 $y=rand(0,$this->height);
	 $jiaodu=rand(0,360);
	 $fontsize=rand(8,15);
	 $fonturl=$this->fonturl;
	 $originalcode = $this->distrubcode;
	 $countdistrub = strlen($originalcode);
	 $dscode = $originalcode[rand(0,$countdistrub-1)];
	 $color = ImageColorAllocate($im, rand(40,140),rand(40,140),rand(40,140));
	 imagettftext($im,$fontsize,$jiaodu,$x,$y,$color,$fonturl,$dscode);
	
	 }
	 }
	 private function set_code($im){
	 $width=$this->width;
	 $counts=$this->counts;
	 $height=$this->height;
	 $scode=$this->session;
	 $y=floor($height/2)+floor($height/4);
	 $fontsize=rand(30,35);
	 $fonturl="C:\Windows\Fonts\AdobeGothicStd-Bold.otf";//$this->fonturl;
	
	 $counts=$this->counts;
	 for($i=0;$i<$counts;$i++){
	 $char=$scode[$i];
	 $x=floor($width/$counts)*$i+8;
	 $jiaodu=rand(-20,30);
	 $color = ImageColorAllocate($im,rand(0,50),rand(50,100),rand(100,140));
	 imagettftext($im,$fontsize,$jiaodu,$x,$y,$color,$fonturl,$char);
	 }
	
	
	
	 }
	 private function sessioncode(){
	 $originalcode = $this->distrubcode;
	 $countdistrub = strlen($originalcode);
	 $_dscode = "";
	 $counts=$this->counts;
	 for($j=0;$j<$counts;$j++){
	 $dscode = $originalcode[rand(0,$countdistrub-1)];
	 $_dscode.=$dscode;
	 }
	 return $_dscode;
	
	 }
	 }
	 Header("Content-type: image/GIF");
	 $imagecode=new Imagecode(160,50);
	 $imagecode->imageout();

	
	</span>

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