In PHP, there are two main methods: one is to use the DateTime class, and the other is to use the strtotime() function. 1. Use the DateTime class to be used for PHP 5.3 and above, especially the DateTime::createFromFormat() method to parse strings in the specified format, such as $date = DateTime::createFromFormat('Ym-d', '2024-04-05'); 2. Use the strtotime() function to be suitable for handling natural language formats, such as strtotime("next Friday"), but it relies on the system to automatically parse, and errors are prone to when the format is not standard. Notes include: the format must be matched, time zone settings must be paid attention to, error checking must be performed to ensure successful parsing. The two methods have applicable scenarios, and the appropriate method should be selected according to the input format.
In PHP, the date is mainly set from a string, which depends on DateTime class or strtotime() function. These two methods are the most used and are more practical.
Set dates using the DateTime class
This is the recommended practice at present, especially in PHP 5.3 and above. DateTime::createFromFormat() method allows you to specify a format to parse strings, with higher accuracy.
For example:
$date = DateTime::createFromFormat('Ym-d', '2024-04-05'); echo $date->format('Ym-d'); // Output: 2024-04-05
Common format description:
-
Y: Four-digit year (such as 2024) -
m: Double-digit month (01~12) -
d: Double digit date (01~31) -
H: hours (24-hour system) -
i: minutes -
s: seconds
If you are not sure about the format of the input, you can also use new DateTime($string) directly, which will try to automatically parse date strings in common formats.
Use the strtotime() function to convert
This function is suitable for handling some relatively free-form strings, such as "now", "1 day", "next Friday", and so on.
For example:
$timestamp = strtotime("2024-04-05");
echo date("Ymd", $timestamp); // Output: 2024-04-05The advantage is flexibility and can handle the time of natural language expression, but the disadvantage is that if the string format is not standard, it is prone to errors or return false.
Pay attention to when using:
- It returns a Unix timestamp, and the output needs to be converted using
date() - The support for some formats is not stable enough, such as dates with horizontal bars may have problems in some older versions
FAQs and Suggestions
- The format must match : When using
createFromFormat(), the format passed in must correspond exactly to the string, otherwise the result may be incorrect. - Time Zone Issues : By default, PHP uses the server's time zone settings. If necessary, you can set the time zone via
date_default_timezone_set(). - Error checking cannot be missed : No matter which method it is, it is best to judge whether the date has been successfully parsed, such as checking whether the return value is false or null.
Simple verification example:
$date = DateTime::createFromFormat('Ym-d', 'not-a-date');
if (!$date) {
echo "date format error";
}Basically these are the operations. There are two methods that have applicable scenarios, just choose the appropriate method according to your input format.
The above is the detailed content of php set date from string. For more information, please follow other related articles on the PHP Chinese website!
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