Is this php/mysql expression (which sets the timezone of connection) safe enough?

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How does the Bladesinging wizard's Extra Attack feature interact with the additional Attack action from the Haste spell? , Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers ,Making statements based on opinion; back them up with references or personal experience.

I would check first if date_default_timezone_get() returns a valid value, to avoid a query like: SET time_zone = "".

date_default_timezone_get()
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Reading the timezone set using the date_default_timezone_set() function (if any) , Reading the timezone set using the date_default_timezone_set() function (if any) ,date_default_timezone_set() - Sets the default timezone used by all date/time functions in a script,date_default_timezone_get — Gets the default timezone used by all date/time functions in a script

date_default_timezone_set: Europe / London
date.timezone: Europe / London
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The mysql command shown here assumes that you connect to the server using an account such as root that has privileges for modifying tables in the mysql system schema. Adjust the connection parameters as required. , If set to SYSTEM, every MySQL function call that requires a time zone calculation makes a system library call to determine the current system time zone. This call may be protected by a global mutex, resulting in contention. , MySQL Server maintains several time zone settings: , After running mysql_tzinfo_to_sql, restart the server so that it does not continue to use any previously cached time zone data.

The initial global server time zone value can be specified explicitly at startup with the --default-time-zone option on the command line, or you can use the following line in an option file:

default -time - zone = 'timezone'

If you have the SYSTEM_VARIABLES_ADMIN privilege (or the deprecated SUPER privilege), you can set the global server time zone value at runtime with this statement:

SET GLOBAL time_zone = timezone;
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your mysql connection’s timezone. Because you can dynamically set it per connection. Aren’t timezones neat?,your mysql’s timezone on the server. That may or may not be the same as the system’s. Usually it is.,your ACTUAL time zone. I live in Oxford, so my timezone right now is BST, or UTC+1,your php’s timezone. Again, it is usually your system’s, but it might not be.

Because of the above, it follows your timezone changes. Look at this:

mysql > select * from datetypes;
Empty set(0.00 sec)

mysql > insert into datetypes(ts, dt) values(now(), now());
Query OK, 1 row affected(0.00 sec)

mysql > select * from datetypes; +
-- -- + -- -- -- -- -- -- -- -- -- -- - + -- -- -- -- -- -- -- -- -- -- - +
|
id | ts | dt |
   + -- -- + -- -- -- -- -- -- -- -- -- -- - + -- -- -- -- -- -- -- -- -- -- - +
   |
   1 | 2016 - 06 - 01 23: 55: 29 | 2016 - 06 - 01 23: 55: 29 |
   + -- -- + -- -- -- -- -- -- -- -- -- -- - + -- -- -- -- -- -- -- -- -- -- - +
   1 row in set(0.00 sec)

mysql > set time_zone = '+8:00';
Query OK, 0 rows affected(0.00 sec)

mysql > select * from datetypes; +
-- -- + -- -- -- -- -- -- -- -- -- -- - + -- -- -- -- -- -- -- -- -- -- - +
|
id | ts | dt |
   + -- -- + -- -- -- -- -- -- -- -- -- -- - + -- -- -- -- -- -- -- -- -- -- - +
   |
   1 | 2016 - 06 - 02 06: 55: 29 | 2016 - 06 - 01 23: 55: 29 |
   + -- -- + -- -- -- -- -- -- -- -- -- -- - + -- -- -- -- -- -- -- -- -- -- - +
   1 row in set(0.00 sec)

mysql > insert into datetypes(ts, dt) values(now(), now());
Query OK, 1 row affected(0.00 sec)

mysql > set time_zone = '+1:00';
Query OK, 0 rows affected(0.00 sec)

mysql > select * from datetypes; +
-- -- + -- -- -- -- -- -- -- -- -- -- - + -- -- -- -- -- -- -- -- -- -- - +
|
id | ts | dt |
   + -- -- + -- -- -- -- -- -- -- -- -- -- - + -- -- -- -- -- -- -- -- -- -- - +
   |
   1 | 2016 - 06 - 01 23: 55: 29 | 2016 - 06 - 01 23: 55: 29 |
   |
   2 | 2016 - 06 - 01 23: 59: 22 | 2016 - 06 - 02 06: 59: 22 |
   + -- -- + -- -- -- -- -- -- -- -- -- -- - + -- -- -- -- -- -- -- -- -- -- - +
   2 rows in set(0.00 sec)
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There’s a lot of outdated information on the Web that leads new PHP users astray, propagating bad practices and insecure code. PHP: The Right Way is an easy-to-read, quick reference for PHP popular coding standards, links to authoritative tutorials around the Web and what the contributors consider to be best practices at the present time.,This is bad practice for all sorts of reasons, mainly that it’s hard to debug, hard to test, hard to read and it is going to output a lot of fields if you don’t put a limit on there.,Another option is to use the PHP Coding Standards Fixer. It will show which kind of errors the code structure had before it fixed them.,Right now PHP does not support Unicode at a low level. There are ways to ensure that UTF-8 strings are processed OK, but it’s not easy, and it requires digging in to almost all levels of the web app, from HTML to SQL to PHP. We’ll aim for a brief, practical summary.

> php - S localhost: 8000
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There are several ways to set server system variables:,There are a few ways to see the full list of server system variables:,Description: Time in seconds that the server waits for a connect packet before returning a 'Bad handshake'. Increasing may help if clients regularly encounter 'Lost connection to MySQL server at 'X', system error: error_number' type-errors. ,Description: When the server starts, this variable is set to the server host name.

  • While in the mysql client, run:
SHOW VARIABLES;
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Do not read any option files. This must be the first option on the command line if it is used. , The name of an option file to be read instead of the usual option files. This must be the first option on the command line if it is used. , --no-defaults Do not read any option files. This must be the first option on the command line if it is used. , This program loads the time zone tables in the mysql database using the contents of the host system zoneinfo database (the set of files describing time zones). SQL. See Section 5.5.7, “mysql_tzinfo_to_sql — Load the Time Zone Tables”.

To see the values that a server will use based on its compiled-in defaults and any option files that it reads, use this command:

mysqld--verbose--help
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