PHP Verification Code, PHP captcha Code _php Tutorial

PHP Verification Code, PHP captcha code

Design a verification code class that can be called at any time when needed

Verification code class, Save as ValidateCode.class.php

1 
 Php2 //Verification Code Class3 Session_Start();4 classValidatecode {5  Private $charset= ' abcdefghkmnprstuvwxyzABCDEFGHKMNPRSTUVWXYZ23456789 ';//Random Factor6  Private $code;//Verification Code7  Private $codelen= 4;//Verification Code Length8  Private $width= 130;//width9  Private $height= 50;//HeightTen  Private $img;//Graphics Resource Handle One  Private $font;//the specified font A  Private $fontsize= 20;//Specify font size -  Private $fontcolor;//Specify font Color - //Construction method initialization the   Public function__construct () { -   $this->font = './latha.ttf ';//Note that the font path must be written, otherwise it will not show the picture -  } -  //Generate random Code +  Private functionCreatecode () { -   $_len=strlen($this->charset)-1; +    for($i= 0;$i<$this->codelen;$i++) { A    $this->code. =$this->charset[Mt_rand(0,$_len)]; at   } -  } -  //Generate Background -  Private functionCreatebg () { -   $this->img = Imagecreatetruecolor ($this->width,$this-height); -   $color= Imagecolorallocate ($this->img,Mt_rand(157,255),Mt_rand(157,255),Mt_rand(157,255)); inImagefilledrectangle ($this->img,0,$this->height,$this->width,0,$color); -  } to  //Generate text +  Private functionCreateFont () { -   $_x=$this->width/$this-Codelen; the    for($i= 0;$i<$this->codelen;$i++) { *    $this->fontcolor = Imagecolorallocate ($this->img,Mt_rand(0,156),Mt_rand(0,156),Mt_rand(0,156)); $Imagettftext ($this->img,$this->fontsize,Mt_rand( -30,30),$_x*$i+Mt_rand(1,5),$this->height/1.4,$this->fontcolor,$this->font,$this->code[$i]);Panax Notoginseng   } -  } the  //generate lines, snowflakes +  Private functionCreateline () { A   //Lines the    for($i= 0;$i<6;$i++) { +    $color= Imagecolorallocate ($this->img,Mt_rand(0,156),Mt_rand(0,156),Mt_rand(0,156)); -Imageline ($this->img,Mt_rand(0,$this->width),Mt_rand(0,$this->height),Mt_rand(0,$this->width),Mt_rand(0,$this->height),$color); $   } $   //Snowflakes -    for($i= 0;$i<100;$i++) { -    $color= Imagecolorallocate ($this->img,Mt_rand(200,255),Mt_rand(200,255),Mt_rand(200,255)); theImagestring ($this->img,Mt_rand(1,5),Mt_rand(0,$this->width),Mt_rand(0,$this->height), ' * ',$color); -   }Wuyi  } the  //Output -  Private functionOutPut () { Wu  Header(' Content-type:image/png '); -Imagepng ($this-img); AboutImagedestroy ($this-img); $  } -  //External Generation -   Public functiondoimg () { -   $this-CREATEBG (); A   $this-Createcode (); +   $this-createline (); the   $this-CreateFont (); -   $this-OutPut (); $  } the  //Get Verification Code the   Public functionGetCode () { the   return Strtolower($this-code); the  } -}

Note: In line 16th, to modify the path of the font, the font picture cannot be displayed

Implemented, saved as captcha.php

1 Session_Start (); 2 require './validatecode.class.php ';  // first, the class is included and the actual path is modified according to the actual situation.  3$_vcnew validatecode ();  // instantiate an object 4 $_VC, doimg ();   5 $_session $_VC->getcode (); // The verification code is saved to the session

Page usage

< img   title = "Click to refresh" src = "./captcha.php" Align = "Absbottom" onclick = "this.src= ' captcha.php?" +math.random (); " 
  > 
    img > 

Reprinted from: A Beautiful PHP Verification code class (share)

http://www.bkjia.com/PHPjc/973822.html www.bkjia.com true http://www.bkjia.com/PHPjc/973822.html techarticle PHP Verification Code, PHP captcha code design a verification code class, when necessary, you can call the code class at any time, save as ValidateCode.class.php 1? PHP 2//Verification code Class 3 session ...

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