PHP implementation of timeline function code_PHP tutorial

This article will introduce how to implement time conversion based on the timeline.
First we need to understand several functions of time:
time(): Returns the current Unix timestamp
date(): Format a local time/date.
Application example:

strtotime(): Parse the date and time description of any English text into a Unix timestamp.
Application example:

date_default_timezone_set(): Set the default time zone to be used.
Generally we set Beijing time: date_default_timezone_set("PRC");
After understanding the above functions, we can write the timeline function:
The principle of this function is to compare the current system time with the target time, and get A difference value, and then compare the difference value with the time range (converted into seconds), and output different results according to the range of the time axis (for example: 5 minutes ago). For ease of calculation, we convert the times into Unix timestamps.

The parameter $time in function tranTime() must be Unix time Stamp, if not, please use strtotime() to convert it to a Unix timestamp first. The above code is easy to understand at a glance, so there is no need to elaborate further.
Call the function and output directly: