PHP using the GD library to do verification Code, PHPGD Library Verification Code _php tutorial

Source: Internet
Author: User

PHP using the GD library to do verification Code, PHPGD Library Verification Code


<?php require_once ' string.func.php ';//verify code via GD Library/** * Add validation text * @param int $type * @param int $length */function Buildrand  Omstring ($type =1, $length =4) {$row = ';  if ($type ==1) {$row =join (", Range (0, 9));  }else if ($type ==2) {$row =join (",", Array_merge (Range (' A ', ' Z '), Range (' A ', ' Z ')));  }else if ($type ==3) {$row =join (",", Array_merge (Range (' A ', ' Z '), Range (' A ', ' Z '), range (0, 9));  };    $row =str_shuffle ($row);  $row =substr ($row, 0, $length); return $row;} /** * generates thumbnails * @param int $type//contains numbers or English * @param int $length How many characters * @param int $pixel The density of the interfering dots * @param int $DST The _h of the interference line Degree * @param string//verification code name in $_session */function verifyimage ($type =1, $length =4, $pixel =0, $line =0, $sess _name = "Verify")  {//session_start ();  Create canvas $width = 100;  $height = 40;  $image = Imagecreatetruecolor ($width, $height);  $white = Imagecolorallocate ($image, 255, 255, 255);  $black = imagecolorallocate ($image, 0, 0, 0); Fills the canvas with a filled rectangle imagefilledrectangle ($image, 1, 1, $width-2, $height-2, $white);  $chars = buildrandomstring ($type, $length);  $_session [$sess _name] = $chars; $fontfiles = Array ("Msyh. TTF "," MSYHBD. TTF "," Simli. TTF "," SimSun. TTC "," simyou. TTF "," stzhongs.  TTF "); $fontfiles = Array ("Simkai.  TTF "); Because the font file is larger, just keep a font, if the students need to add their own fonts, fonts in your computer's Fonts folder, directly run input fonts can see the corresponding font for ($i = 0; $i < $length; $i + +) {$s    ize = Mt_rand (14, 18);    $angle = Mt_rand (-15, 15);    $x = 5 + $i * $size;    $y = Mt_rand (20, 26); $fontfile = ". /fonts/".    $fontfiles [Mt_rand (0, Count ($fontfiles)-1)];    $color = Imagecolorallocate ($image, Mt_rand (), Mt_rand (90, 180), mt_rand (+);    $text = substr ($chars, $i, 1);  Imagettftext ($image, $size, $angle, $x, $y, $color, $fontfile, $text); if ($pixel) {for ($i = 0; $i <; $i + +) {Imagesetpixel ($image, Mt_rand (0, $width-1), Mt_rand (0,    $height-1), $black); }} if ($line) {for ($i = 1; $i < $line; $i + +) {$color = ImagecolOrallocate ($image, Mt_rand, Mt_rand, Mt_rand (90, 180));  Imageline ($image, Mt_rand (0, $width-1), Mt_rand (0, $height-1), Mt_rand (0, $width-1), Mt_rand (0, $height    -1), $color);  }} header ("Content-type:image/gif");  Imagegif ($image); Imagedestroy ($image);}

Main points:

1. If Session_Start () is not stated earlier, it is necessary to declare;
2, the font can be downloaded in the CMF input fonts to their own definition of the Fonts folder;
3. $_session [$sess _name] can be compared by $_post to obtain the verification code entered by the user.

Articles you may be interested in:

    • PHP Generate image Verification code, click to switch instances
    • Perfect solution for thinkphp Verification code error cannot be displayed method
    • thinkphp Open Verification Code page display garbled solution
    • PHP program always prompts for incorrect verification code input solution
    • PHP implementation of IMEI limit SMS verification code send class
    • How to use PHP to hack a website verification code
    • PHP Generate Captcha function
    • PHP to send SMS verification code to complete the registration function
    • PHP-Made Simple CAPTCHA identification code

http://www.bkjia.com/PHPjc/1117053.html www.bkjia.com true http://www.bkjia.com/PHPjc/1117053.html techarticle PHP using the GD library to do verification Code, PHPGD Library Verification code php require_once ' string.func.php ';//through the GD Library to do verification code/** * Add verification text * @param int $type * @param int $len Gth*/funct ...

  • Contact Us

    The content source of this page is from Internet, which doesn't represent Alibaba Cloud's opinion; products and services mentioned on that page don't have any relationship with Alibaba Cloud. If the content of the page makes you feel confusing, please write us an email, we will handle the problem within 5 days after receiving your email.

    If you find any instances of plagiarism from the community, please send an email to: info-contact@alibabacloud.com and provide relevant evidence. A staff member will contact you within 5 working days.

    A Free Trial That Lets You Build Big!

    Start building with 50+ products and up to 12 months usage for Elastic Compute Service

    • Sales Support

      1 on 1 presale consultation

    • After-Sales Support

      24/7 Technical Support 6 Free Tickets per Quarter Faster Response

    • Alibaba Cloud offers highly flexible support services tailored to meet your exact needs.