The concrete implementation method of PHP graphics verification Code _php tutorial

We are now in the site registration and other places often see you need to enter a verification code, it is the random numbers or symbols in the form of a picture in front of the user, and provide verification before using the relevant features. Today we will introduceThe specific implementation code is as follows:

 
 

  
  

  
  php   
  
  

  

  
  

  
Class rndnum{
  
  

  

  
  

  
function rnd () {
  
  

  
Srand (Double) microtime () *1000000);
  
  

  
$ Rnd_number = Array ( 
  
  

  
1 = > ' 1 ',
  
  

  
2 = > ' 2 ',
  
  

  
3 = > ' 3 ',
  
  

  
4 = > ' 4 ',
  
  

  
5 = > ' 5 ',
  
  

  
6 = > ' 6 ',
  
  

  
7 = > ' 7 ',
  
  

  
8 = > ' 8 ',
  
  

  
9 = > ' 9 ',
  
  

  
Ten = > ' A ',
  
  

  
 One = > ' B ',
  
  

  
 A = > ' C ',
  
  

  
 - = > ' d ',
  
  

  
 - = > ' E ',
  
  

  
 the = > ' F ',
  
  

  
 - = > ' G ',
  
  

  
 - = > ' h ',
  
  

  
 - = > ' i ',
  
  

  
 + = > ' J ',
  
  

  
 - = > ' K ',
  
  

  
 + = > ' l ',
  
  

  
 A = > ' m ',
  
  

  
 at = > ' n ',
  
  

  
 - = > ' O ',
  
  

  
 - = > ' P ',
  
  

  
 - = > ' Q ',
  
  

  
 - = > ' R ',
  
  

  
 - = > ' s ',
  
  

  
 in = > ' t ',
  
  

  
 - = > ' u ',
  
  

  
 to = > ' V ',
  
  

  
 + = > ' W ',
  
  

  
 - = > ' x ',
  
  

  
 the = > ' y ',
  
  

  
 * = > ' z ',
  
  

  
 $ = > ' 0 '
  
  

  
);
  
  

  
$ result = Array_rand ($rnd _number,6); 
  
  

  
$ J = Count ($result); 
  
  

  
For ($i=0; $i<$j; $i + +) {
  
  

  
$ Re. = $rnd _number[$result [$i]]; 
  
  

  
}
  
  

  
//$ Re = $rnd _number[$result [1]]. $rnd _number[$result [2]]. $rnd _number[$result [3]]. $rnd _number[$result [4]]. $rnd _ number[$result [5]]. $rnd _number[$result [6]]. $rnd _number[$result [7]]; 
  
  

  
Return Array_keys ($result);
  
  

  
return $re;
  
  

  
}
  
  

  
}
  
  

  
/* Usage
  
  

  
$ Rndnum = New Rndnum (); 
  
  

  
$ Num = $rndnum- > Rnd (); 
  
  

  
Echo $num;
  
  

  
*/
  
  

  
?>  
 
 

Generate a picture of PHP graphics verification Code, fill the random number into the inside:

 
 

  
  

  
  php   
  
  

  

  
  

  
Header ("Content-type:image/png");
  
  

  
Require_once ("rndnum.php");
  
  

  
$ Rndnum = New Rndnum (); 
  
  

  
$ Authnum = $rndnum- > Rnd (); 
  
  

  
Session_Start ();
  
  

  
$_session["Extrra_code"]= $authnum;
  
  

  
$ im  =  imagecreate (72,20); 
  
  

  
$ Black  =  imagecolorallocate ($im, 0,0,0); 
  
  

  
$  White  =  imagecolorallocate ($im, 255,255,255); 
  
  

  
$ Gray  =  imagecolorallocate ($im, 200,200,200); 
  
  

  
Imagefill ($im, 0,0, $gray);
  
  

  
Imagestring ($im, 5,10,3, $authnum, $black);
  
  

  
For ($i=0; $i<$i + + )//Add interfering pixels
  
  

  
{
  
  

  
 $ Randcolor  =  imagecolorallocate ($im, Rand (0,255), Rand (0,255), Rand (0,255)); 
  
  

  
Imagesetpixel ($im, Rand ()%70, Rand ()%30, $randcolor);
  
  

  
}
  
  

  
Imagepng ($im);
  
  

  
Imagedestroy ($im);
  
  

  
?>  
 
 

The above is the implementation of all PHP graphics verification Code, I hope to help you.

http://www.bkjia.com/PHPjc/446423.html www.bkjia.com true http://www.bkjia.com/PHPjc/446423.html techarticle we are now in the site registration and other places often meet to require you to enter a verification code, it is to be random numbers or symbols in the form of a picture in front of the user, and provide verification before ...

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