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<?php
Header("Content-type:image/png");
//定義header，聲明圖片文件，最好是png，無(wú)版權(quán)之?dāng)_;
//生成新的四位整數(shù)驗(yàn)證碼
session_start();//開啟session;
$authnum_session = '';
$str = 'abcdefghijkmnpqrstuvwxyz1234567890';
//定義用來(lái)顯示在圖片上的數(shù)字和字母;
$l = strlen($str); //得到字串的長(zhǎng)度;
//循環(huán)隨機(jī)抽取四位前面定義的字母和數(shù)字;
for($i=1;$i<=4;$i++)
{
$num=rand(0,$l-1);
//每次隨機(jī)抽取一位數(shù)字;從第一個(gè)字到該字串最大長(zhǎng)度,
//減1是因?yàn)榻厝∽址菑?開始起算;這樣34字符任意都有可能排在其中;
$authnum_session.= $str[$num];
//將通過(guò)數(shù)字得來(lái)的字符連起來(lái)一共是四位;
}
session_register("authnum_session");
//用session來(lái)做驗(yàn)證也不錯(cuò);注冊(cè)session,名稱為authnum_session,
//其它頁(yè)面只要包含了該圖片
//即可以通過(guò)$_SESSION["authnum_session"]來(lái)調(diào)用
//生成驗(yàn)證碼圖片，
srand((double)microtime()*1000000);
$im = imagecreate(50,20);//圖片寬與高;
//主要用到黑白灰三種色;
$black = ImageColorAllocate($im, 0,0,0);
$white = ImageColorAllocate($im, 255,255,255);
$gray = ImageColorAllocate($im, 200,200,200);
//將四位整數(shù)驗(yàn)證碼繪入圖片
imagefill($im,68,30,$gray);
//如不用干擾線，注釋就行了;
$li = ImageColorAllocate($im, 220,220,220);
for($i=0;$i<3;$i++)
{//加入3條干擾線;也可以不要;視情況而定，因?yàn)榭赡苡绊懹脩糨斎?
imageline($im,rand(0,30),rand(0,21),rand(20,40),rand(0,21),$li);
}
//字符在圖片的位置;
imagestring($im, 5, 8, 2, $authnum_session, $white);
for($i=0;$i<90;$i++)
{//加入干擾象素
imagesetpixel($im, rand()%70 , rand()%30 , $gray);
}
ImagePNG($im);
ImageDestroy($im);
?>
中文
<?php
/*
* 文件:code.php
* 作用:驗(yàn)證碼生成
*/
session_start();
// 設(shè)置 content-type
header("Content-type: image/png");
// 創(chuàng)建圖片
$im = imagecreatetruecolor(120, 30);
$ChineseChar = array("人","出","來(lái)","友","學(xué)","孝","仁","義","禮","廉","忠","國(guó)","中","易","白","者","火 ","土","金","木","雷","風(fēng)","龍","虎","天","地",
"生","暈","菜","鳥","田","三","百","錢","福 ","愛","情","獸","蟲","魚","九","網(wǎng)","新","度","哎","唉","啊","哦","儀","老","少","日",
"月 ","星");
// 創(chuàng)建顏色
$fontcolor = imagecolorallocate($im, 255, 255, 255);
$bg = imagecolorallocate($im, 0, 0, 0);
// 設(shè)置文字
for($i=0;$i<4;$i++) $text .= $ChineseChar[(array_rand($ChineseChar))];
$_SESSION['code'] = $text;
// 設(shè)置字體 [url]http://www.font.com.cn/downlist/s_12_3.html[/url] 有_GBK系列的字體下載,一般GD庫(kù)都支持的!
$font = 'gbk.ttf';
// 添加文字
imagettftext($im, 18, 0, 11, 21, $fontcolor, $font, iconv("GB2312","UTF-8",$text));
// 輸出圖片
imagepng($im);
imagedestroy($im);
?>
php技術(shù)：php中文字母數(shù)字驗(yàn)證碼實(shí)現(xiàn)代碼，轉(zhuǎn)載需保留來(lái)源！
鄭重聲明：本文版權(quán)歸原作者所有，轉(zhuǎn)載文章僅為傳播更多信息之目的，如作者信息標(biāo)記有誤，請(qǐng)第一時(shí)間聯(lián)系我們修改或刪除，多謝。
