Discuss how many timestamps there are in PHP

PHP timestamp refers to the number of seconds since 0:00:00 on January 1, 1970. It can represent an absolute time and is not affected by factors such as time zone and region. In PHP, we can get the current timestamp through the time() function, or convert a date string into a timestamp through the strtotime() function. However, you may find that the number of digits in the PHP timestamp is not the same, so how many digits does the PHP timestamp have?

Number of digits in PHP timestamp

In PHP, the number of digits occupied by a timestamp depends on the data type used. Common timestamp types include integer and floating point. Among them, the integer timestamp occupies 32 bits and the floating point timestamp occupies 64 bits.

Integer timestamp

In PHP, using an integer timestamp is the most common practice because it can be easily obtained through the time() function. The maximum value that can be stored in an integer timestamp is 2147483647. If this value is exceeded, overflow will occur, resulting in an incorrect timestamp. Therefore, when using integer timestamps, you need to pay attention to the synchronization of the time zone and computer time to avoid affecting the accuracy of the timestamp.

Floating point timestamp

Floating point timestamp is only supported in PHP 5 or above. It can store a larger time range, but it requires space More memory space. Floating point timestamps have higher precision than integer timestamps and can be accurate to microseconds. When precise measurement of time intervals is required, using floating point timestamps is a better choice.

Summary

In PHP, timestamp is a way to represent absolute time, which can avoid the impact of factors such as time zone errors on time. The number of digits in the PHP timestamp depends on the data type used. The integer timestamp occupies 32 bits and the floating point timestamp occupies 64 bits. When using timestamps, you need to pay attention to the synchronization of the time zone and computer time to avoid affecting the accuracy of the timestamps. At the same time, choosing the appropriate timestamp type according to the actual situation can better meet the needs.

The above is the detailed content of Discuss how many timestamps there are in PHP. For more information, please follow other related articles on the PHP Chinese website!