PHP 5 with GD，筆記一下，最近很容易不小心砍掉一些東西，還是記錄一下比較保險。這是在 PHP 5 才能運作的東西，因為我改寫成靜態的類，所以，就這樣吧（無責）。
update, 為了怕扭曲圖形識別上的困難，所以加了是不是要扭曲圖形的設定。
參考來源：http://blog.wu-boy.com/2009/01/05/701/
呼叫方式：
<?php
session_start();
VerifyCodeImage::SetImage(3,6,120,40);
靜態類別 VerifyCodeImage，至於怎麼改寫 session 就留給大家啦。
<?php
define ('ROOT', '../');
class VerifyCodeImage {
static $vc;
public static function SetImage($mode, $v_num, $img_w, $img_h, $distortion = true, $int_pixel_num = 70, $int_line_num = 1, $border=true, $borderColor='0,0,0', $font_dir='library/fonts') {
if(!isset($_SESSION['authCode'])){
$_SESSION['authCode'] = '';
}
self::$vc->mode = $mode; // 1.文字模式, 2.字母模式, 3.文字字母混合模式
self::$vc->v_num = $v_num; // 驗證碼個數
self::$vc->img_w = $img_w; // 圖像寬度
self::$vc->img_h = $img_h; // 圖像高度
self::$vc->distortion = $distortion; // 扭曲圖形
self::$vc->int_pixel_num = $int_pixel_num; // 干擾像數個數
self::$vc->int_line_num = $int_line_num; // 干擾線條數量
self::$vc->border = $border; // 圖像邊框
self::$vc->borderColor = $borderColor; // 圖像邊框顏色
self::$vc->font_dir = ROOT . $font_dir; // 字型文件路徑
self::GenerateImage();
}
private static function GetChar($mode)
{
switch($mode) {
case 1:
$ychar = '0,1,2,3,4,5,6,7,8,9';
break;
case 2:
$ychar = 'a,b,c,d,e,f,g,h,i,j,k,l,m,n,o,p,q,r,s,t,u,v,w,x,y,z';
break;
case 3:
default:
$ychar = "0,1,2,3,4,5,6,7,8,9,a,b,c,d,e,f,g,h,i,j,k,l,m,n,o,p,q,r,s,t,u,v,w,x,y,z";
}
return $ychar;
}
private static function RandColor($rs, $re, $gs, $ge, $bs, $be)
{
$r = mt_rand($rs, $re);
$g = mt_rand($gs, $ge);
$b = mt_rand($bs, $be);
return array($r, $g, $b);
}
private static function GenerateImage()
{
$ychar = self::GetChar(self::$vc->mode);
$list = explode(",", $ychar);
$cmax = count($list) - 1;
$fonts = scandir(self::$vc->font_dir);
$fmax = count($fonts) - 2;
$fontrand = mt_rand(2, $fmax);
$font = self::$vc->font_dir.'/'.$fonts[$fontrand];
// 驗證碼
$v_code = "";
for($i = 0; $i < self::$vc->v_num; $i++){
$randnum = mt_rand(0, $cmax);
$this_char = $list[$randnum];
$v_code .= $this_char;
}
// 填入驗證碼
$textX = self::$vc->img_w * 0.02;
$textY = self::$vc->img_h * 0.75;
$im = imagecreatetruecolor (self::$vc->img_w + 50, self::$vc->img_h);
$color = imagecolorallocate($im, 32, 81, 183);
$ranum = mt_rand(0, 2);
if($ranum == 0){
$color = imagecolorallocate($im, 32, 81, 183);
}else if($ranum == 1){
$color = imagecolorallocate($im, 17, 158, 20);
}else{
$color = imagecolorallocate($im, 196, 31, 11);
}
imagefill($im, 0, 0, imagecolorallocate($im, 255, 255, 255) );
imagettftext ($im, 22, mt_rand(-6, 6), $textX, $textY, $color, $font, $v_code);
// 干擾線條
for($i = 0; $i < self::$vc->int_line_num; $i++){
$rand_color_line = $color;
imageline($im, mt_rand(2,intval(self::$vc->img_w/3)), mt_rand(10,self::$vc->img_h - 10), mt_rand(intval(self::$vc->img_w - (self::$vc->img_w/3) + $textX),self::$vc->img_w - 10), mt_rand(0,self::$vc->img_h), $rand_color_line);
}
// 扭曲圖形
if(self::$vc->distortion==true) {
$ranum = mt_rand(0, 1);
$dis_range = mt_rand(8, 12);
$distortion_im = imagecreatetruecolor (self::$vc->img_w * 1.5 ,self::$vc->img_h);
imagefill($distortion_im, 0, 0, imagecolorallocate($distortion_im, 255, 255, 255));
for ($i = 0; $i < self::$vc->img_w + 50; $i++) {
for ($j = 0; $j < self::$vc->img_h; $j++) {
$rgb = imagecolorat($im, $i, $j);
if($ranum == 0){
if( (int)($i+40+cos($j/self::$vc->img_h * 2 * M_PI) * 10) <= imagesx($distortion_im) && (int)($i+20+cos($j/self::$vc->img_h * 2 * M_PI) * 10) >=0 ) {
imagesetpixel ($distortion_im, (int)($i+10+cos($j/self::$vc->img_h * 2 * M_PI - M_PI * 0.4) * $dis_range), $j, $rgb);
}
}else{
if( (int)($i+40+sin($j/self::$vc->img_h * 2 * M_PI) * 10) <= imagesx($distortion_im) && (int)($i+20+sin($j/self::$vc->img_h * 2 * M_PI) * 10) >=0 ) {
imagesetpixel ($distortion_im, (int)($i+10+sin($j/self::$vc->img_h * 2 * M_PI - M_PI * 0.4) * $dis_range), $j, $rgb);
}
}
}
}
}
// 干擾像素
for($i = 0; $i < self::$vc->int_pixel_num; $i++){
$rand_color_pixel = $color;
if(self::$vc->distortion) {
imagesetpixel($distortion_im, mt_rand() % self::$vc->img_w + $textX, mt_rand() % self::$vc->img_h, $rand_color_pixel);
} else {
imagesetpixel($im, mt_rand() % self::$vc->img_w + $textX, mt_rand() % self::$vc->img_h, $rand_color_pixel);
}
}
// 繪製邊框
if(self::$vc->border){
$border_color_line = self::$vc->borderColor;
if(self::$vc->distortion) {
imageline($distortion_im, 0, 0, self::$vc->img_w + $textX, 0, $border_color_line); // 上橫
imageline($distortion_im, 0, self::$vc->img_h-1, self::$vc->img_w + $textX, self::$vc->img_h-1, $border_color_line); // 下橫
imageline($distortion_im, 0, 0, 0, self::$vc->img_h, $border_color_line); // 左豎
imageline($distortion_im, self::$vc->img_w + $textX, 0, self::$vc->img_w + $textX, self::$vc->img_h, $border_color_line); // 右豎
} else {
imageline($im, 0, 0, self::$vc->img_w + $textX, 0, $border_color_line); // 上橫
imageline($im, 0, self::$vc->img_h-1, self::$vc->img_w + $textX, self::$vc->img_h-1, $border_color_line); // 下橫
imageline($im, 0, 0, 0, self::$vc->img_h, $border_color_line); // 左豎
imageline($im, self::$vc->img_w + $textX, 0, self::$vc->img_w + $textX, self::$vc->img_h, $border_color_line); // 右豎
}
}
if(self::$vc->distortion) {
imageantialias($distortion_im, true); // 消除鋸齒
} else {
imageantialias($im, true); // 消除鋸齒
}
$_SESSION['authCode'] = $v_code;
// 生成圖像給瀏覽器
header('Content-Transfer-Encoding: binary');
header('Last-Modified: ' . gmdate('D, d M Y H:i:s \G\M\T', $_SERVER['REQUEST_TIME']));
header('Cache-Control: private');
header('Pragma: no-cache');
if (function_exists("imagegif")) {
header ("Content-type: image/gif");
if(self::$vc->distortion) { imagegif($distortion_im); } else { imagegif($im); }
}else if (function_exists("imagepng")) {
header ("Content-type: image/png");
if(self::$vc->distortion) { imagepng($distortion_im); } else { imagepng($im); }
}else if (function_exists("imagejpeg")) {
header ("Content-type: image/jpeg");
if(self::$vc->distortion) { imagejpeg($distortion_im, '', 80); } else { imagejpeg($im, '', 80); }
}else if (function_exists("imagewbmp")) {
header ("Content-type: image/vnd.wap.wbmp");
if(self::$vc->distortion) { imagewbmp($distortion_im); } else { imagewbmp($im); }
}else{
die("No Image Support On This Server !");
}
imagedestroy($im);
if(self::$vc->distortion) imagedestroy($distortion_im);
}
}
