Php verification code session

Php verification code session

 Widht = $ widht; $ this-> height = $ height; $ this-> codenum = $ codenum;} function showcode () {$ this-> createcode (); // Create a canvas $ this-> createstring (); // create a string $ this-> createimage (); // generate an image} private function createcode () // Create a canvas {$ this-> image = imagecreate ($ this-> widht, $ this-> height); $ backcolor = imagecolorallocate ($ this-> image, 255,255,255 ); // to change the background color, set RGBimagefill ($ this-> image, $ backcolor) here; if ($ this-> bg = true) {$ bg = Imagecolorallocate ($ this-> image, 221,221,221); for ($ I = 0; $ I <$ this-> widht/2; $ I ++) // draw a vertical line at the bottom of {imageline ($ this-> image, $ I * 2, 0, $ I * 2, $ this-> height, $ bg );} for ($ I = 0; $ I <$ this-> height/3; $ I ++) // draw horizontal shading {imageline ($ this-> image, 0, $ I * 3, $ this-> widht, $ I * 3, $ bg) ;}} private function createstring () // write the string {$ string = $ this-> codestring (); session_start (); $ _ SESSION ["your code"] = $ string; for ($ I = 0; $ I <$ this-> coden Um; $ I ++) {if ($ this-> randttf = true) {$ ttf = 'ttfs/t '. rand (1, 9 ). '. ttf'; // ensure that the ttfs folder is in the same directory as the random font. if you change the path, change the path} else {$ ttf = 'ttfs/t1.ttf '; // for fonts in 9, please use your common sense. you only need to modify the numbers in t4 from 1 to 9 to see the effect of each font. select your favorite note: please turn off the random font test} $ fontsize = rand (); // Generate the random font size $ fontangle = rand ); // the character skew angle $ x = $ I * 12 + 4; $ y = rand ($ fontsize, $ this-> height-8 ); if ($ this-> randcolor = true) {$ textcolor = imagecolorallocate ($ this-> image, rand (0,180 ), Rand (0,180), rand (0,180);} else {$ textcolor = imagecolorallocate ($ this-> image, 0 );} imagettftext ($ this-> image, $ fontsize, $ fontangle, $ x, $ y, $ textcolor, $ ttf, $ string [$ I]);} private function codestring () // Generate a random string {$ string = ''; for ($ I = 0; $ I <$ this-> codenum; $ I ++) {$ num = rand ();/** For a single format, refer to ** as long as a number is required ** to set $ num = rand) change to $ num = rand () ** only lower case letters ** and change $ num = rand () above to $ num = rand (3), 3) ** only use uppercase letters **. Change $ num = rand () to $ num = rand) ** only lower-case letters and numbers are required ** Change $ num = rand () above to $ num = rand () **/switch ($ num) {case 1: $ num2 = rand (); // generates the ASCII value break for lowercase letters a-z at random; case 2: $ num2 = rand ); // Generate the ASCII code value corresponding to number 2 9 at random. if it is rand (48, 57): 0-9, there will be 0, which is not conducive to the user's determination of break; case 3: $ num2 = rand (97,122); // randomly generate break for the ASCII code corresponding to uppercase letters A-Z ;} /** remove 0 o I 1 z Z 2 **/if ($ num2 = 111 | $ num = 105 | $ num = 122 | $ num2 = 79 | $ num2 = 73 | $ num = 90) // if it is an O in an uppercase letter, I will replace {$ num2 = 112;} $ tmp = sprintf ("% c", $ num2) with P ); // use the sprintf function to obtain the character $ string corresponding to the generated ASCII code. = $ tmp;} return $ string;} private function createimage () // generate an image {if (function_exists ("imagegif") {header ("Content-type: image/gif "); imagegif ($ this-> image);} elseif (function_exists (" imagejpeg ") {header (" Content-type: image/jpeg "); imag Ejpeg ($ this-> image, "", 50); // 50 indicates the image quality. 0-100 indicates the worst quality. the smaller the image file, the better the quality, larger image file} elseif (function_exists ("imagepng") {header ("Content-type: image/png"); imagepng ($ this-> image );} elseif (function_exists ("imagewbmp") {header ("Content-type: image/vnd. wap. wbmp "); imagewbmp ($ this-> image);} else {die ('Servers do not support images; check the GD database');} function _ destruct () {imagedestroy ($ this-> image) ;}}?>

The above is the verification code class

Below is the test page

 Showcode (); if (strtoupper ($ _ GET ["code"])! = $ _ SESSION ["verification code"]) {echo 'verification code input error';} else {echo 'verification code right';}?>

I have already mentioned in the class that the verification code string is assigned to $ _ SESSION ['verification Code'], but when I test the page, I cannot obtain the printed session array and no result is returned.

Reply to discussion (solution)

It's too long. I didn't see it.

Is the form page and verification code page under different second-level domain names?

The logic of the test code below is incorrect.

PHP code


/*
* Class name: verification code class
* Function: you can use this type of object to obtain the verification code image and the verification code character set ($ _ SESSION ['verification Code']).
* Author: xiao,
* Time: 2012-7-3
*/
Final class Encoding code
{
Private $ width ;......

There is no second-level domain name. I will probably assign a value to $ _ SESSION directly in the verification code class, but I cannot get the SESSION that I assign a value to in the class on other pages.

It's too long. I didn't see it.

Is the form page and verification code page under different second-level domain names?
There is no second-level domain name. I will probably assign a value to $ _ SESSION directly in the verification code class, but I cannot get the SESSION that I assign a value to in the class on other pages.

Other pages session_start?

It's not because of initialization class.
Function _ construct ($ widht = 60, $ height = 30, $ codenum = 4)

Session_start ();

Php simple verification code (letters + numbers)
Http://3aj.cn/php/27.html