A simple and secure PHP code class with Call method, PHP verification code attached to call _php tutorial

A simple and secure PHP code class 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 Code * * Security Code to: Verify code Text Twist, rotate, use different fonts, add interference 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 = ' 346789ABCDEFGHJKLMNPQRTUVWXY ';  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 format: $_session[self:: $seKey] = array (' Code ' = ' captcha value ', ' time ' = ' Verification Code creation time '); */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 ();} Plot 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);//This is a lot better than Imagettftext and imagestring. $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 (ω x+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 is more than Imagettftext and IMA Gestring with a font size (without this while loop) the performance is much better $i-; }}}}/** * Draw the dots * to write letters or numbers of different colors on the picture * * protected static function _writenoise () {for ($i = 0; $i < $i + +) {//Matte 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_rand ( -10, Self:: $imageL), Mt_rand ( -10, Self:: $imageH), self :: $codeSet [Mt_rand (0, 27)],//Miscellaneous text for random letters or numbers $noiseColor); }}}/** * Verify that the verification code is correct * * @param string $code User Verification code * @param BOOL User Verification code is correct */public static function check ($code) {Isse T ($_session) | | Session_Start (); The verification code cannot be empty if (empty ($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:: $seKey]);//echo $ _session[self:: $seKey [' Code ']. ' 2 '; return false; return 0; }//if ($code = = $_session[self:: $seKey [' Code ']) {if (Strtoupper ($code) = = $_session[self:: $seKey] [' Code ']) {// Case insensitive comparison//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 Trueyl_security_secoder:: $useCurve = tRue Yl_security_secoder::entry (); *//*//Verification code if (! Yl_security_secoder::check (@$_post[' Secode ')) {print ' Error secode ';} */
  
 

Third, call method

1. Display Verification code page code.php

<?php  session_start (); require ' secoder.class.php ';//first include the class, the actual path is modified according to the actual situation.  $vcode = new Yl_security_secoder ();  Instantiate an Object  

2. Check that the verification code is correct

<?php  session_start (); require ' secoder.class.php ';//first include the class, 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);   

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 everyone's learning to help, but also hope that we support a lot of help the home.

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