<?php

// 通過GD庫做驗證碼

require_once 'string.func.php';

function verifyImage($type=1,$length=4,$pixel=0,$line=0,$sess_name = "verify")//sess_name:驗證碼的名字

{

? ? session_start();

? ? // 創(chuàng)建畫布

? ? $width = 200;

? ? $height = 100;

? ? $image = imagecreatetruecolor($width, $height);

? ? $white = imagecolorallocate($image, 255, 255, 255);

? ? $black = imagecolorallocate($image, 0, 0, 0);

? ? // 畫一個矩形并填充

? ? imagefilledrectangle($image, 1, 1, $width - 2, $height - 2, $white);

? ? $chars = buildRandomString($type, $length);

? ? $_SESSION[$sess_name] = $chars;

? ? $fontfiles = array(

? ? ? ? "FZTJLSJW.TTF",

? ? ? ? "MSYH.TTF",

? ? ? ? "MSYHBD.TTF",

? ? ? ? "SIMFANG.TTF",

? ? ? ? "SIMSUN.TTC"

? ? ? ??

? ? );

? ? for ($i = 0; $i < $length; $i ++) {

? ? ? ? $size = mt_rand(14, 18);

? ? ? ? $angle = mt_rand(- 15, 15);

? ? ? ? $x = 5 + $i * $size;

? ? ? ? $y = mt_rand(20, 26);

? ? ? ? $color = imagecolorallocate ( $image, mt_rand ( 50, 90 ), mt_rand ( 80, 200 ), mt_rand ( 90, 180 ) );

? ? ? ? $fontfile = "../fonts/" . $fontfiles[mt_rand(0, count($fontfiles) - 1)];

? ? ? ? $text = substr($chars, $i, 1);

? ? ? ? imagettftext($image, $size, $angle, $x, $y, $color, $fontfile, $text);

? ? }

?

? ? if ($pixel) {

? ? ? ? for ($i = 0; $i < 50; $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(50, 90), mt_rand(80, 200), 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 );

? ? ? ? }

? ? }

? ? ob_clean();

? ? header ( "content-type:image/gif" );

? ? imagegif($image);

? ? imagedestroy($image);

}

verifyImage(1,4,5,10,5);

<?php

/**

?* 生成驗證碼

?* @param number $type

?* @param number $length

?* @return string

?*/

function buildRandomString($type=1,$length=4)

{

? ??

? ? if ($type == 1) {

? ? ? ? ? ? ?$chars = join("", range(0, 9));

? ? } elseif ($type == 2) {

? ? ? ? ? ? ?$chars = join("", array_merge(range("a", "z"), range("A", "Z")));

? ? } elseif ($type == 3) {

? ? ? ? $chars = join("", array_merge(range("a", "z"), range("A", "Z"), range(0, 9)));

? ? }

? ? if ($length > strlen($chars)) {

? ? ? ? exit("字符串長度不夠");

? ? }

? ? $chars = str_shuffle($chars);

? ? return substr($chars, 0, $length);

}