PHP面试题基础有关问题
PHP面试题基础问题
1.对于大流量的网站,您采用什么样的方法来解决访问量问题?
首先,确认服务器硬件是否足够支持当前的流量
其次,优化数据库访问。
第三,禁止外部的盗链。
第四,控制大文件的下载。
第五,使用不同主机分流主要流量。
第六,使用流量分析统计软件。
2.用PHP写出显示客户端IP与服务器IP的代码:
//显示客户端IP
function get_client_ip() {#
if(getenv('HTTP_CLIENT_IP')) {
$client_ip = getenv('HTTP_CLIENT_IP');
} elseif(getenv('HTTP_X_FORWARDED_FOR')) {
$client_ip = getenv('HTTP_X_FORWARDED_FOR');
} elseif(getenv('REMOTE_ADDR')) {
$client_ip = getenv('REMOTE_ADDR');
} else {
$client_ip = $HTTP_SERVER_VAR['REMOTE_ADDR'];
}
return $client_ip;
}
//服务器IP
function get_server_ip(){
if (isset($_SERVER))
{
if($_SERVER['SERVER_ADDR']) $huoqu_ip=$_SERVER['SERVER_ADDR'];
else $huoqu_ip=$_SERVER['LOCAL_ADDR'];
}
else
{
$huoqu_ip=getenv('SERVER_ADDR');
}
return $huoqu_ip;
}
3.MYsql编程面试题。
(1) 某内容管理系统中,表message有如下字段:
id 文章id
title 文章标题
content 文章内容
category_id 文章分类id
hits 点击量
创建上表,写出MySQL语句:
CREATE TABLE 'message'(
id int(11) NOT NULL auto_increment,
title varchar(200) default NULL,
content blob,
category_id int(11) default NULL,
hits int(11) default NULL,
PRIMARY KEY('id')
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
(2)同样上述新闻发布系统:表comment记录用户回复内容,字段如下:
comment_id 回复id
id 文章id,关联message表中的id
comment_content 回复内容
现通过查询数据库需要得到以下格式的文章标题列表,并按照回复数量排序,回复最高的排在最前面
文章id 文章标题 点击量 回复数量
用一个SQL语句完成上述查询,如果文章没有回复则回复数量显示为0
SELECT message.id id,message.title title,IF(message.`hits` IS NULL,0,message.`hits`)
hits,IF(comment.`id` is NULL,0,count(*)) number
FROM message LEFT JOIN comment ON message.id=comment.id
GROUP BY message.`id`
(3)上述内容管理系统,表category保存分类信息,字段如下 (3分)
category_id int(4) not null auto_increment;
categroy_name varchar(40) not null;
用户输入文章时,通过选择下拉菜单选定文章分类
写出如何实现这个下拉菜单
function categoryList()
{
$result=mysql_query("select category_id,categroy_name from category")
or die("Invalid query: " . mysql_error());
print("");
}

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