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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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