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

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.

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