


PHP solves the problem of high website traffic and high concurrency, and php solves the problem of traffic concurrency
First of all, confirm whether the server hardware is enough to support the current traffic.
Ordinary P4 servers can generally support up to 100,000 independent IPs per day. If the number of visits is greater than this,
then you must first configure a higher-performance dedicated server to solve the problem
, otherwise no amount of optimization can completely solve the performance problem.
Secondly, optimize database access.
It is of course best to implement complete staticization of the front desk, as there is no need to access the database at all. However, for websites that are frequently updated,
staticization often cannot satisfy certain functions.
Caching technology is another solution, which is to store dynamic data in cache files. Dynamic web pages directly call
these files without having to access the database. Both WordPress and Z-Blog use this method extensively. Caching technology. I
also wrote a counter plug-in for Z-Blog, which is also based on this principle.
If it is indeed impossible to avoid access to the database, you can try to optimize the query SQL of the database. Avoid using statements such as
Select * from. Each query only returns the results you need, avoiding the need for a short period of time. A large number of
SQL queries.
Third, external hotlinking is prohibited.
Hotlinking of pictures or files from external websites often brings a lot of load pressure, so external hotlinking of pictures or files to one's own
should be strictly restricted. Fortunately, you can simply refer to it at present. To control hotlinking, Apache itself
can disable hotlinking through configuration. IIS also has some third-party ISAPIs that can achieve the same function.
Of course, forging referrals can also be done through code to achieve hotlinking, but currently there are not many people who deliberately forge referrals to hotlink.
You can ignore it or use non-technical means to solve it, such as on pictures. Add watermark.
Fourth, control the download of large files.
Downloading large files will take up a lot of traffic, and for non-SCSI hard drives, downloading a large number of files will consume
CPU, reducing the website's responsiveness. Therefore, try not to provide downloads of large files exceeding 2M. If
is required, it is recommended to place large files on another server.
Fifth, use different hosts to divert the main traffic
Place files on different hosts and provide different images for users to download. For example, if you feel that RSS files take up
a lot of traffic, then use services such as FeedBurner or FeedSky to place the RSS output on other hosts. In this way, most of the traffic pressure of other people's access will be concentrated on FeedBurner's host, and RSS will not be available. It takes up too many resources.
Sixth, use traffic analysis and statistics software.
Install a traffic analysis and statistics software on the website, you can instantly know which places consume a lot of traffic and which pages
need to be optimized. Therefore, accurate statistical analysis is required to solve the traffic problem. Can.

php把负数转为正整数的方法:1、使用abs()函数将负数转为正数,使用intval()函数对正数取整,转为正整数,语法“intval(abs($number))”;2、利用“~”位运算符将负数取反加一,语法“~$number + 1”。

实现方法:1、使用“sleep(延迟秒数)”语句,可延迟执行函数若干秒;2、使用“time_nanosleep(延迟秒数,延迟纳秒数)”语句,可延迟执行函数若干秒和纳秒;3、使用“time_sleep_until(time()+7)”语句。

php除以100保留两位小数的方法:1、利用“/”运算符进行除法运算,语法“数值 / 100”;2、使用“number_format(除法结果, 2)”或“sprintf("%.2f",除法结果)”语句进行四舍五入的处理值,并保留两位小数。

判断方法:1、使用“strtotime("年-月-日")”语句将给定的年月日转换为时间戳格式;2、用“date("z",时间戳)+1”语句计算指定时间戳是一年的第几天。date()返回的天数是从0开始计算的,因此真实天数需要在此基础上加1。

php判断有没有小数点的方法:1、使用“strpos(数字字符串,'.')”语法,如果返回小数点在字符串中第一次出现的位置,则有小数点;2、使用“strrpos(数字字符串,'.')”语句,如果返回小数点在字符串中最后一次出现的位置,则有。

php字符串有下标。在PHP中,下标不仅可以应用于数组和对象,还可应用于字符串,利用字符串的下标和中括号“[]”可以访问指定索引位置的字符,并对该字符进行读写,语法“字符串名[下标值]”;字符串的下标值(索引值)只能是整数类型,起始值为0。

方法:1、用“str_replace(" ","其他字符",$str)”语句,可将nbsp符替换为其他字符;2、用“preg_replace("/(\s|\ \;||\xc2\xa0)/","其他字符",$str)”语句。

在php中,可以使用substr()函数来读取字符串后几个字符,只需要将该函数的第二个参数设置为负值,第三个参数省略即可;语法为“substr(字符串,-n)”,表示读取从字符串结尾处向前数第n个字符开始,直到字符串结尾的全部字符。


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