How to convert string to timestamp in php

In PHP, we often need to convert strings into timestamps for date and time comparison and calculation. In this article, we will discuss how to convert a string into a timestamp in PHP.

The format of timestamp in PHP is Unix timestamp, which represents the number of seconds from 0:00:00 on January 1, 1970 to the present. So, to convert a string into a timestamp, we need to know the format of the string in order to convert it into a timestamp.

The following are some common time string formats:

• "Y-m-d H:i:s": year-month-day hour:minute:second

• "Y/m/d H:i:s"：Year/Month/Day Hour:Minute:Second

• "Y-m-d"：Year- Month-day

• "Y/m/d"：Year/month/day

• "H:i:s"：Hour: Minutes: Seconds

Use the PHP built-in function strtotime() function to convert the string into a Unix timestamp, as shown below:

$time = strtotime("2021-07-01 10:30:00");
echo $time; // 输出1625134200

The above code converts the string "2021-07-01 10:30:00" is converted into a Unix timestamp.

If you want to convert a time string in another format into a Unix timestamp, you can use the following code:

$time = strtotime("2021/07/01 10:30:00");
echo $time; // 输出1625134200

The above code will convert the string "2021/07/01 10:30: 00" is converted to a Unix timestamp.

If you want to convert a string containing only date into a Unix timestamp, you can use the following code:

$time = strtotime("2021-07-01");
echo $time; // 输出1625107200

The above code converts the string "2021-07-01" into a Unix timestamp .

If you want to convert a string containing only time into a Unix timestamp, you can use the following code:

$time = strtotime("10:30:00");
echo $time; // 输出1625161800

The above code converts the string "10:30:00" into a Unix timestamp .

When converting a string into a Unix timestamp, you need to pay attention to the format of different time strings for smooth conversion. At the same time, we can also convert the Unix timestamp into a date and time string, as shown below:

$time = 1625134200;
$date = date("Y-m-d H:i:s", $time);
echo $date; // 输出2021-07-01 10:30:00

The above code converts the Unix timestamp 1625134200 into a date and time string "2021-07-01 10:30: 00".

Summary: In PHP, we can use the strtotime() function to convert a time string into a Unix timestamp, or use the date() function to convert a Unix timestamp into a time string. When using these functions, you need to pay attention to the format of the time string and the unit of the Unix timestamp.

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