Simple and secure PHP verification code with call method, PHP code attached to call _php tutorial

Simple and secure PHP verification code with call method, PHP verification code attached to the call

Example of a verification code

Second, PHP Verification code class, secoder.class.php

<?php/** * Security Verification Code * * Security Code to: Verify code Text Twist, rotate, use different fonts, add noise code * * @author Running water Mengchun
 
  
  * @link Http://labs.yulans.cn/YL_Security_Secoder * @link Http://wiki.yulans.cn/docs/yl/security/secoder */class Yl_    The subscript of the session of the Security_secoder {/** * Verification code * * @var String *///public static $seKey = ' Sid.sek ey.ylans.cn ';   public static $seKey = ' Sid ';   public static $expire = 3000; Verification code Expiration Time (s)/** * The characters used in the verification code, 01IO is easy to confuse, it is recommended not to * * @var String */public static $codeSet = ' 346789ABCDEFGHJKL   Mnpqrtuvwxy ';   public static $fontSize = 25;  Captcha font size (px) public static $useCurve = true;  Whether to draw the confusion curve public static $useNoise = true;    Whether to add a miscellaneous public static $imageH = 0;    Captcha picture wide public static $imageL = 0;    Captcha picture Long public static $length = 4; Verify the number of code bits public static $BG = Array (243, 251, 254);   Background protected static $_image = NULL;   Authenticode picture instance protected static $_color = NULL; CAPTCHA Font Color/** * Output Verification code and save the value of the verification code in the session * verification code saved to session in the format: $_session[self:: $seKey] = array (' Code ' = ' Verification code Value ', ' time ' = ' Verification Code created '); */public static function entry () {//Picture width (px) Self:: $imageL | | self:: $imageL = self:: $length * Self:: $fontSize      * 1.5 + Self:: $fontSize *1.5; Picture height (px) Self:: $imageH | |     Self:: $imageH = self:: $fontSize * 2;      Create a self:: $imageL x Self:: $imageH image self::$_image = Imagecreate (self:: $imageL, Self:: $imageH);      Set Background imagecolorallocate (Self::$_image, Self:: $BG [0], Self:: $BG [1], Self:: $BG [2]);     CAPTCHA font random Color Self::$_color = imagecolorallocate (Self::$_image, Mt_rand (1,120), Mt_rand (1,120), Mt_rand (1,120)); The captcha uses a random font//$ttf = DirName (__file__). '/ttfs/'. Mt_rand (1, 20). '. TTF '; 4 $ttf = dirname (__file__).           '/ttfs/4.ttf ';     if (self:: $useNoise) {//Plot dot self::_writenoise ();     } if (self:: $useCurve) {//Draw interference line self::_writecurve (); }//Draw verification Code $code = Array (); Verification code $codeNX = 0; The left margin of the nth character of the captcha for ($i = 0; $i
  
   
 0) {Imagesetpixel (self::$_image, $px + $i, $py + $i, self::$_color);//Here the image is better than Imagettftext and imagestring performance.         Multi-$i-;         }}} $A = Mt_rand (1, Self:: $imageH/2);  Amplitude $f = Mt_rand (-self:: $imageH/4, Self:: $imageH/4); X-axis direction Offset $T = Mt_rand (self:: $imageH *1.5, Self:: $imageL);        Cycle $w = (M_PI)/$T;     $b = $py-$A * sin ($w * $px + $f)-Self:: $imageH/2;     $PX 1 = $px 2;     $px 2 = self:: $imageL;  for ($px = $px 1; $px <= $px 2, $px = $px + 0.9) {if ($w!=0) {$py = $A * Sin ($w * $px + $f) + $b + self:: $imageH/2;         y = Asin (ωx+φ) + b $i = (int) (self:: $fontSize-8)/4); while ($i > 0) {imagesetpixel (self::$_image, $px + $i, $py + $i, self::$_color);//here (while) the cycle of the image point than the IMA         Gettftext and imagestring use a font size to draw (without this while loop) a much better performance $i-; }}}}/** * Draw the dots * Write a different color letter or number on the picture */protected static function _writenoise () {for($i = 0; $i < $i + +)                 {//DOT color $noiseColor = imagecolorallocate (Self::$_image, Mt_rand (150,225),       Mt_rand (150,225), Mt_rand (150,225)); for ($j = 0; $j < 5; $j + +) {//Plot point imagestring (Self::$_image, 5, Mt_ran            D ( -10, Self:: $imageL), Mt_rand ( -10, Self:: $imageH), Self:: $codeSet [Mt_rand (0, 27)],//Miscellaneous text is a random letter or number       $noiseColor); }}}/** * Verify that the verification code is correct * * @param string $code User Verification code * @param BOOL User Verification code is correct */public static F     Unction Check ($code) {isset ($_session) | | | session_start (); The verification code cannot be empty if (empty ($code) | | empty ($_session[self:: $seKey])) {//echo $_session[self:: $seKey [' Code ']. '       1 ';                return false; }//Session expires if (time ()-$_session[self:: $seKey [' time '] > Self:: $expire) {unset ($_session[self:: $seK       EY]); Echo $_session[self:: $seKey [' Code ']. '       2 ';       return false;     return 0; }//if ($code = = $_session[self:: $seKey [' Code ']) {if (Strtoupper ($code) = = $_session[self:: $seKey] [' Code ']) {//No region Comparison of//echo $_session[self:: $seKey [' Code ']. '       3 ';         return true; }//echo $_session[self:: $seKey [' Code ']. '     4 ';            return false; }}//useage/* Yl_security_secoder:: $useNoise = false; To be more secure, change to True yl_security_secoder:: $useCurve = true; Yl_security_secoder::entry (); */*//Verify the Verification code if (!  Yl_security_secoder::check (@$_post[' Secode ')) {print ' Error secode ';} */
  
 

Third, call method

1. Display Verification code page code.php

<?php    session_start ();   Require ' secoder.class.php '; First, the class is included and the actual path is modified according to the actual situation.    $vcode = new Yl_security_secoder ();   Instantiate an object    $vcode->entry ();  ? >  

2. Check that the verification code is correct

<?php    session_start ();   Require ' secoder.class.php '; First, the class is included and the actual path is modified according to the actual situation.    $vcode = new Yl_security_secoder ();   Instantiate an object    //$vcode->entry ();    $code = $_get[' code ');    echo $vcode->check ($code);       $_session[' Code ' = $VC->getcode ();//verification code saved to SESSION?>  

3. Verification Code Input Box call page

Click the picture to retrieve the verification code again
  

The above is the whole content of this article, I hope that you learn PHP programming help.

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