what is php timestamp

The timestamp refers to the time from 00:00:00 GMT on January 1, 1970 (08:00:00 on January 1, 1970 Beijing time) to The current total number of milliseconds. In layman's terms,

A timestamp is a piece of complete and verifiable data that can represent the existence of a piece of data at a specific point in time. It is mainly proposed to provide users with an electronic evidence to prove the generation time of certain data of

users. In practical applications, it can be used in all aspects including e-commerce and financial activities, and can especially be used to support the "non-repudiation" service of public key infrastructure

.

The first thing you need to know is that the method to get the time in PHP is date(), and the methods to get the timestamp in PHP are time() and strtotime(). They are explained below.

date() format is: date($format, $timestamp), format is the format, timestamp is the timestamp (optional).

time() returns the Unix timestamp of the current time, without arguments.

strtotime($time, $now) Parses any English text datetime description into a Unix timestamp. $time is required and specifies the time string to be parsed; $now is used to calculate the timestamp of the return value. If this parameter is omitted, the current time is used.

date($format) usage example:

echo date('Y-m-d');输出结果：2012-03-22
echo  date('Y-m-d H:i:s');输出结果：2012-03-22 23:00:00
echo  date('Y-m-d', time());输出结果：2012-03-22 23:00:00（结果同上，只是多一个时间戳参数，时间戳转换为日期格式的方法）
echo  date('Y').'年'.date('m').'月'.date('d').'日'，输出结果：2012年3月22日

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