PHP graphic verification code sharing, php graphic Verification Code

PHP graphic verification code sharing, php graphic Verification Code

Effect:

Myvcode. class. php: class that encapsulates the verification code

<? Php
/*
* File: myvcode. class. php
* Verification Code Class, Class Name Vcode
*/
Class Vcode
{
Private $ width;/* Verification Code width */
Private $ height;/* Verification Code height */
Private $ codeNum;/* number of characters in the Verification Code */
Private $ checkCode;/* Verification Code character */
Private $ image;/* Verification Code resource */
Private $ pixNum;/* Number of interference points to be drawn */
Private $ lineNum;/* number of lines that draw interference lines */

/*
* Constructor instantiate the verification code object and initialize data
* @ Param int $ width: Set the default width.
* @ Param int $ height: sets the default height.
* @ Param int $ codeNum: set the number of characters in the verification code.
* @ Param int $ pixNum: sets the number of interference points.
* @ Param int $ lineNum: sets the number of interference lines.
*/
Function _ construct ($ width = 80, $ height = 40, $ codeNum = 4, $ pixNum = 40, $ lineNum = 5)
{
$ This-> width = $ width;
$ This-> height = $ height;
$ This-> codeNum = $ codeNum;
$ This-> pixNum = $ pixNum;
$ This-> lineNum = $ lineNum;
}
/* Internal private method to create image resources */
Private function getCreateImage ()
{
$ This-> image = imagecreatetruecolor ($ this-> width, $ this-> height );
$ White = imagecolorallocate ($ this-> image, 0xff, 0xff, 0xff );
Imagefill ($ this-> image, 0, 0, $ white );
$ Black = imagecolorallocate ($ this-> image, 0, 0 );
Imagerectangle ($ this-> image, 0, 0, $ this-> width-1, $ this-> height-1, $ black );
}
/* Internal private method, draw characters, remove o0Llz and 012 */
Private function createCheckCode ()
{
$ Code = '3456789abcdefghijkmnpqrstuvwxyabcdefghijkmnpqrstuvwxy ';
$ This-> checkCode = "";
For ($ I = 0; $ I <$ this-> codeNum; $ I ++)
{
$ Char = $ code {rand (0, strlen ($ code)-1 )};
$ This-> checkCode. = $ char;
$ FontColor = imagecolorallocate ($ this-> image, rand (0,128), rand (0,128), rand (0,128 ));
$ FontSize = rand (3, 5 );
$ X = rand (0, $ this-> width-imagefontwidth ($ fontSize ));
$ Y = rand (0, $ this-> height-imagefontheight ($ fontSize ));
Imagechar ($ this-> image, $ fontSize, $ x, $ y, $ char, $ fontColor );
}
}
/* Set interference elements in internal private methods */
Private function setDisturbColor ()
{
/* Draw interference points */
For ($ I = 0; $ I <$ this-> pixNum; $ 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 );
}
/* Draw interference lines */
For ($ I = 0; $ I <$ this-> lineNum; $ I ++)
{
$ Color = imagecolorallocate ($ this-> image, rand (0,255), rand (0,255), rand (0,255 ));
Imageline ($ this-> image, rand (1, $ this-> width/2), rand (1, $ this-> height/2 ),
Rand ($ this-> width/2, $ this-> width-2), rand ($ this-> height/2, $ this-> height-2 ), $ color );

}
}
/* Enable session saving and use echo to output the image */
Function _ toString ()
{
$ _ SESSION ['code'] = strtoupper ($ this-> checkCode );
$ This-> getCreateImage ();
$ This-> createCheckCode ();
$ This-> setDisturbColor ();
$ This-> outputImg ();
}
/* Internal private method output image */
Private function outputImg ()
{
Header ("content-type: image/png ");
Imagepng ($ this-> image );
}
/* Destructor, release object */
Function _ destruct ()
{
Imagedestroy ($ this-> image );
}
}
?>

Imgcode. php output image

<?phpsession_start();require_once('myvcode.class.php');echo new Vcode();?>

Test.html: Same as img Tag reference

You can add a tag and use js to achieve another effect:

/* Partial refresh for verification code */
Function changeCode ()
{
Var imgcode = document. getElementById ('code ');
Var change = document. getElementById ('change ');
Change. onclick = function ()
{
/* You must add the following parameters to refresh */
Imgcode. src = 'Code. php? Tm '+ Math. random ();
}
}

Code and change are the IDs of img and a respectively.

Php image Verification Code

This is a phpcms Verification Code. It is very useful after over 10 thousand website experiences.
<? Php

Session_start ();

$ Enablegd = 1;
// Determine whether the image processing function exists
$ Funcs = array ('imagecreatetruecolor', 'imagecolorallocate', 'imagefill', 'imagestring', 'imageline ', 'imagerotate', 'imagedestroy', 'imagecolorallocatealpha ', 'imageellipse', 'imagepng ');
Foreach ($ funcs as $ func)
{
If (! Function_exists ($ func ))
{
$ Enablegd = 0;
Break;
}
}

Ob_clean (); // clear the buffer

If ($ enablegd)
{
// Create captcha
$ Consts = 'cdfgkmnpqrstwxyz23456 ';
$ Vowels = 'aek23456789 ';
For ($ x = 0; $ x <6; $ x ++)
{
$ Const [$ x] = substr ($ consts, mt_rand (0, strlen ($ consts)-1), 1); // obtain a random number in $ consts
$ Vow [$ x] = substr ($ vowels, mt_rand (0, strlen ($ vowels)-1), 1); // obtain a random number in $ vowels
}
$ Radomstring = $ const [0]. $ vow [0]. $ const [2]. $ const [1]. $ vow [1]. $ const [3]. $ vow [3]. $ const [4];
$ _ SESSION ['checkcode'] = $ string = substr ($ radomstring,); // display 4 characters

$ ImageX = strlen ($ radomstring) * 8; // Image Width
$ ImageY = 20; // Image Height
$ Im = imagecreatetruecolor ($ imageX, $ imageY); // create a true color image

// Creates two variables to store color
$ Background = imagecolorallocate ($ im, rand (180,250), rand (180,250), rand (180,250); // background color
$ ForegroundArr = array (imagecolorallocate ($ im, rand (0, 20), rand (0, 20), rand (0, 20 )),
Imagecolorallocate ($ im, rand (0, 20), rand (0, 10), rand (245,255 )),
Imagecolorallocate ($ im, rand (245,... the remaining full text>

After the php image verification code is inserted, write the judgment code when submitting the code ??

Action. php

<?
Session_start ();
$ Password = md5 (trim ($ _ POST ['Password']);
$ Str_reg = $ _ POST ['number']; // The verification code entered by the user
$ Str_reg = strtoupper ($ str_reg); // converts uppercase letters.

If ($ str_reg! = $ _ SESSION ['yzm'] or empty ($ str_reg ))
{Echo "Incorrect verification code ";
}
Else
{
$ _ SESSION ['yzm'] = ""; // clear the session
......
Perform database query, verify the user name and password
}
?>