How to get time in php and convert it into parameters

In PHP programming, getting time is a very common function. We can use the system's built-in date() function to get the current time, or specify a format to get a specified time to meet different needs.

Let’s take a closer look at how to get time in PHP and how to convert the obtained time into parameters.

1. Get the current time

Getting the current time is one of the most common needs in our programming, used for recording logs, generating order numbers, etc.

Use the date() function to get the current time. The syntax is as follows:

date(format, [timestamp]);

Among them, format is the time format we want, and timestamp is an optional parameter used to specify a time. stamp. (By default, the timestamp parameter is empty, that is, the current time is obtained)

Let’s take a look at a simple example:

echo date('Y-m-d H:i:s'); // 输出结果为2019-08-10 12:00:00

The above code will be obtained in the format of Y-m-d H:i:s Current time and output.

In the above format parameters, "Y" represents the 4-digit year; "m" represents the 2-digit month; "d" represents the 2-digit date; "H" represents the 24-hour format Hours; "i" represents minutes; "s" represents seconds.

Through the combination of these parameters, we can get different time formats.

2. Conversion timestamp (timestamp)

The timestamp refers to the number of seconds since 0:00:00 on January 1, 1970. In PHP programming, sometimes we need to operate on timestamps, such as calculating time differences, converting to dates, etc.

We can use the time() function to get the current timestamp. Similarly, we can use the date() function to convert the timestamp into a date. For example:

$timestamp = time(); // 获取当前时间戳
$date = date('Y-m-d H:i:s', $timestamp); // 将时间戳转化为日期
echo $date; // 输出时间

$date The output result is the same as the result of our previous code to obtain the current time.

3. Modify time

Sometimes, we need to operate on time, such as increasing a certain time, decreasing a certain time, etc. In PHP programming, we can use the date() function to operate on time.

For example, the following code can add 1 day to the current date and output:

$date = date('Y-m-d', strtotime('+1 day'));
echo $date; // 输出结果为明天的日期

In the above code, the strtotime() function is used to convert a string into a timestamp. ‘1 day’ means adding one day. If we want to reduce one day, we can change it to ‘-1 day’.

4. Get a specific date

Sometimes, we need to get the time of a specific date. In PHP programming, we can use the strtotime() function to specify a date and convert it into a timestamp, and then use the date() function to convert it into a date.

Let's take the date of September 1, 2019 as an example to see how to implement it:

$timestamp = strtotime('2019-09-01'); //将日期转化为时间戳
$date = date('Y-m-d H:i:s', $timestamp); // 将时间戳转化为日期
echo $date; // 输出结果为2019-09-01 00:00:00

In the above code, we use the strtotime() function to change '2019-09- 01'Convert the date of this string type into a timestamp, and then use the date() function to convert it into a date.

5. Modify time format

Sometimes, we need to modify one time format to another. In PHP programming, we can also use the date() function to achieve this.

For example, we need to change the date format of '2019-09-01 12:00:00' to '2019-09-01 12:00:00', we can achieve it like this:

$orig_date = '2019-09-01 12:00:00'; // 原始日期
$orig_timestamp = strtotime($orig_date); // 将日期转化为时间戳
$new_date = date('Y年m月d日 H时i分s秒', $orig_timestamp); // 将时间戳转化为新的日期格式
echo $new_date; // 输出结果为2019年09月01日 12时00分00秒

In the above code, we use the strtotime() function to convert the string type date '2019-09-01 12:00:00' into a timestamp, and then use the date() function to convert it to New date format.

Summary:

Getting time is a very basic function in PHP programming. We can use the system's built-in functions to obtain time and convert time format to meet different needs. Whether it is to obtain the current time or operate on time, as long as we master the usage of the system's built-in functions, we can easily achieve it.

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