


Commonly used redirect methods are: 301 redirect, 302 redirect and meta fresh:
301 redirect: 301 stands for Permanently Moved. 301 redirect is the best way to be search engine friendly after the web page changes its address. As long as it is not a temporary move, it is recommended to use 301 for redirection.
302 redirect: 302 stands for Temporarily Moved. In the past few years, many Black Hat SEOs have widely used this technology to cheat. At present, all major search engines have stepped up their crackdowns, such as Google. The penalties imposed on Business.com in recent years and more recently on BMW Germany's website. Even if a website is not spam objectively, it can easily be misjudged as spam by search engines and punished.
meta fresh: This was more popular before 2000, but is now rare. Specifically, it uses the meta instruction in the web page to redirect to a new web page after a specific time. If the delay time is too short (within about 5 seconds), it will be judged as spam.
Here we mainly talk about how to redirect web pages through 301 Redirect.

$request_uri = isset($_SERVER['REQUEST_URI']) ? $_SERVER['REQUEST_URI'] : '';//Determine whether the address is followed by There are parameters
if($the_host == 'seocity.cn')//Replace the domain name here with the one you want
{
Header('HTTP/1.1 301 Moved Permanently');// Issue a 301 header
Header('Location: http://www.seocity.cn.$request_uri);//Jump to the address format you want
}

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。

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。

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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