PHP time format control character comparison table_PHP tutorial
format character | Description | Return value example |
---|---|---|
日 | --- | --- |
d | The day of the month, a 2-digit number with leading zeros | 01 to 31 |
j | Day of the month, no leading zero | 1 to 31 |
S | The English suffix after the day of the month, 2 characters | st, nd, rd or th. Can be used with j |
z | Day of the year | 0 to 366 |
week | --- | --- |
l (lower case letter of "L") | Day of the week, complete text format | Sunday to Saturday |
D | Day of the week, text representation, 3 letters | Mon to Sun |
N | Day of the week represented by numbers in ISO-8601 format (new in PHP 5.1.0) | 1 (for Monday) to 7 (for Sunday) |
w | The day of the week, represented by numbers | 0 (for Sunday) to 6 (for Saturday) |
W | The week number of the year in ISO-8601 format, each week starts on Monday (new in PHP 4.1.0) | Example: 42 (the 42nd week of the year) |
Month | --- | --- |
F | Month, complete text format, such as January or March | January to December |
m | The month represented by the number, with leading zeros | 01 to 12 |
M | The month represented by the three-letter abbreviation | Jan to Dec |
n | Numeric month, without leading zeros | 1 to 12 |
t | The number of days in a given month | 28 to 31 |
Year | --- | --- |
L | Whether it is a leap year | 1 if it is a leap year, 0 otherwise |
o | ISO-8601 format year number. This is the same value as Y, except that if the ISO week number (W) belongs to the previous or next year, that year is used.(New in PHP 5.1.0) | Examples: 1999 or 2003 |
Y | Full 4-digit year | For example: 1999 or 2003 |
y | 2-digit year | Example: 99 or 03 |
Time | --- | --- |
a | Lowercase AM and PM values | am or pm |
A | Capital AM and PM values | AM or PM |
B | Swatch Internet Standard Time | 000 to 999 |
g | Hour, 12 hour format, no leading zeros | 1 to 12 |
G | Hour, 24 hour format, no leading zeros | 0 to 23 |
h | Hour, 12 hour format, with leading zeros | 01 to 12 |
H | Hour, 24-hour format, with leading zeros | 00 to 23 |
i | Minutes with leading zeros | 00 to 59> |
s | Seconds, with leading zeros | 00 to 59> |
Time Zone | --- | --- |
e | Time zone identifier (new in PHP 5.1.0) | Example: UTC, GMT, Atlantic/Azores |
I | Whether it is daylight saving time | 1 if daylight saving time, 0 otherwise |
O | Hours from Greenwich Mean Time | For example: +0200 |
P | The difference from Greenwich Mean Time (GMT), there is a colon separating hours and minutes (newly added in PHP 5.1.3) | Example: +02:00 |
T | The time zone where this machine is located | For example: EST, MDT ([Translator's Note] In complete text format under Windows, such as "Eastern Standard Time", the Chinese version will display "China Standard Time"). |
Z | Time difference offset in seconds. Time zone offsets west of UTC are always negative, and time zone offsets east of UTC are always positive. | -43200 to 43200 |
Full date/time | --- | --- |
c | Date in ISO 8601 format (new in PHP 5) | 2004-02-12T15:19:21+00:00 |
r | Date in RFC 822 format | For example: Thu, 21 Dec 2000 16:01:07 +0200 |
U | The number of seconds since the Unix epoch (January 1 1970 00:00:00 GMT), that is, the timestamp | See time() |

What’s still popular is the ease of use, flexibility and a strong ecosystem. 1) Ease of use and simple syntax make it the first choice for beginners. 2) Closely integrated with web development, excellent interaction with HTTP requests and database. 3) The huge ecosystem provides a wealth of tools and libraries. 4) Active community and open source nature adapts them to new needs and technology trends.

PHP and Python are both high-level programming languages that are widely used in web development, data processing and automation tasks. 1.PHP is often used to build dynamic websites and content management systems, while Python is often used to build web frameworks and data science. 2.PHP uses echo to output content, Python uses print. 3. Both support object-oriented programming, but the syntax and keywords are different. 4. PHP supports weak type conversion, while Python is more stringent. 5. PHP performance optimization includes using OPcache and asynchronous programming, while Python uses cProfile and asynchronous programming.

PHP is mainly procedural programming, but also supports object-oriented programming (OOP); Python supports a variety of paradigms, including OOP, functional and procedural programming. PHP is suitable for web development, and Python is suitable for a variety of applications such as data analysis and machine learning.

PHP originated in 1994 and was developed by RasmusLerdorf. It was originally used to track website visitors and gradually evolved into a server-side scripting language and was widely used in web development. Python was developed by Guidovan Rossum in the late 1980s and was first released in 1991. It emphasizes code readability and simplicity, and is suitable for scientific computing, data analysis and other fields.

PHP is suitable for web development and rapid prototyping, and Python is suitable for data science and machine learning. 1.PHP is used for dynamic web development, with simple syntax and suitable for rapid development. 2. Python has concise syntax, is suitable for multiple fields, and has a strong library ecosystem.

PHP remains important in the modernization process because it supports a large number of websites and applications and adapts to development needs through frameworks. 1.PHP7 improves performance and introduces new features. 2. Modern frameworks such as Laravel, Symfony and CodeIgniter simplify development and improve code quality. 3. Performance optimization and best practices further improve application efficiency.

PHPhassignificantlyimpactedwebdevelopmentandextendsbeyondit.1)ItpowersmajorplatformslikeWordPressandexcelsindatabaseinteractions.2)PHP'sadaptabilityallowsittoscaleforlargeapplicationsusingframeworkslikeLaravel.3)Beyondweb,PHPisusedincommand-linescrip

PHP type prompts to improve code quality and readability. 1) Scalar type tips: Since PHP7.0, basic data types are allowed to be specified in function parameters, such as int, float, etc. 2) Return type prompt: Ensure the consistency of the function return value type. 3) Union type prompt: Since PHP8.0, multiple types are allowed to be specified in function parameters or return values. 4) Nullable type prompt: Allows to include null values and handle functions that may return null values.


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