php method to implement Linux shutdown and restart function: 1. Create a PHP sample file; 2. Use PHP to execute linux commands, with code statements such as "exec('/sbin/reboot');"; 3. Give Just restart the command to add permissions.
The operating environment of this article: linux5.9.8 system, PHP7.1 version, DELL G3 computer
phpHow to shutdown and restart Linux Function?
php realizes the shutdown and restart function of Linux
Sometimes, we can DIY a control panel to realize the shutdown and restart function of Linux. As we all know, Linux is a file-based operating system, so to implement the system shutdown and restart function, the following two points must be met
1. Know the absolute path of the command
When operating under Linux, we can directly type the command. But you cannot do this when executing Linux commands with PHP. You need to know the absolute path of the command.
Restart command reboot absolute path/sbin/reboot
Shutdown command shutdown absolute path/sbin/shutdown
2. Use PHP to execute linux commands
Yes There are many functions that I have introduced in blog posts before. It is recommended to use the exec function here.
<?php /** * php执行linux命令 */ // 返回命令执行结果,注意命令要写绝对路径 exec('/sbin/reboot');
3. Add permissions to the restart command
The permissions of Linux are very delicate. The default reboot permissions can only be owned by root. If you want PHP to execute shutdown, you can only give the corresponding permissions to the reboot command
Method 1: Add the nginx/apache operation group to a management group, such as web. Then add reboot to the management group and add the x command to g
Method 2: Directly chmod 4777 /sbin/reboot and press Enter to get it done, but it is not recommended because this means that all users have restart permissions.
Recommended learning: "PHP Video Tutorial"
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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。

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。

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。

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。

查找方法:1、用strpos(),语法“strpos("字符串值","查找子串")+1”;2、用stripos(),语法“strpos("字符串值","查找子串")+1”。因为字符串是从0开始计数的,因此两个函数获取的位置需要进行加1处理。


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