How to convert string into timestamp in php

In PHP development, time manipulation is often an indispensable step. Among them, converting string time into timestamp is also a common requirement. In this article, we will introduce how to use PHP to convert a string time into a timestamp.

1. What is a timestamp?

First of all, we need to understand the timestamp. A timestamp is the total number of seconds from a fixed date (usually January 1, 1970) to the current time. In UNIX and PHP, timestamps are often used.

2. The role of timestamp

The role of timestamp depends on specific business needs. In development, timestamps are often used to compare time sequences, perform time calculations, etc.

3. How to convert a string time to a timestamp

The following is an example of how to use PHP to convert a string time to a timestamp:

$str_time = '2020-11-11 11:11:11';
$time_stamp = strtotime($str_time);
echo $time_stamp;

Above In the code, a string time $str_time is first defined, then the strtotime function is used to convert it into a timestamp, and finally the result is output.

In actual use, you also need to pay attention to the following points:

1. The format of the string time must be consistent with the system time format, otherwise it cannot be converted correctly.
2. strtotimeThe function will return FALSE when the conversion fails. Therefore, you need to determine whether the conversion is successful before using it.

The following is a complete sample code:

$str_time = '2020-11-11 11:11:11';
$time_stamp = strtotime($str_time);

if ($time_stamp === FALSE) {
  echo '字符串时间转换失败';
} else {
  echo $time_stamp;
}

4. Convert timestamp to string time

Sometimes, we need to convert timestamp to String form. At this time, you can use the date function for conversion.

Here is an example that demonstrates how to convert a timestamp to a string time:

$time_stamp = time();
$str_time = date('Y-m-d H:i:s', $time_stamp);
echo $str_time;

In the above code, use the time function to get the current timestamp. Then use the date function to convert it to string form.

It should be noted that when using the date function, the first parameter is a format string. For specific formatting methods, please refer to the PHP official documentation.

5. Summary

This article introduces how to use PHP to convert a string time into a timestamp. For projects with more complex time processing, the use of timestamps can undoubtedly improve development efficiency and enhance code readability.

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