php Mysql time zone setting method: 1. Execute the "show variables like '%time_zone%';" command; 2. Set the time zone by modifying the mysql configuration file my.cnf or my.ini; 3. Through The "set time_zone" command sets the time zone.
The operating environment of this article: Windows7 system, PHP7.1 version, Dell G3 computer
php How to set the time zone of mysql?
MySQL time zone setting method
MySQL time zone defaults to the server's time zone, which is 8 hours different from China's time zone.
View method
SQL code
mysql> show variables like '%time_zone%';
+——————+——–+ | Variable_name | Value | +——————+——–+ | system_time_zone | CST | | time_zone | SYSTEM | +——————+——–+
Modify time zone method
Method 1:
You can modify the time zone by modifying the mysql configuration file my.cnf or my.ini
Add default-time-zone=timezone under [mysqld] .
For example:
default-time-zone = '+8:00'
Restart msyql
Be sure to add it under [mysqld], otherwise unknown variable 'default-time-zone= 8:00' will appear
Method 2:
通过命令 set time_zone = timezone
For example
北京时间(GMT+0800) set time_zone = '+8:00'; 美国pst时间(GMT-08:00) set time_zone = '-8:00';
SQL code
mysql> set time_zone = '+8:00';
Once the database is connected during program development, you can change the MySQL time immediately afterwards code.
mysql_query("SET time_zone = '+8:00'");
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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。

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。

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。

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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