A constant is an identifier for a simple value. The value cannot be modified during the script's execution. A valid constant name starts with a letter or underscore (no dollar($) sign before the name) and by convention constant identifier are always uppercase.
Constants are defined by using the define() function or by using the const keyword outside a class definition as of PHP 5.3.0. The name of the constant and the value must be placed within the parentheses. After defining it can never be changed or undefined. Only scalar data i.e. boolean, integer, float and string can be contained in constants.
PHP valid and invalid constant names
<?php //Valid constants name define("COUNTRY_NAME", "India"); define("CITYNAME", "New Delhi"); define("2NO_OF_STUDENTS", 60); ?>
Example of a PHP constant
<?php define("COUNTRY_NAME", "India"); echo COUNTRY_NAME; ?>
PHP: Tips of the Day
PHP: How to fix error with xml2-config not found when installing PHP from sources?
All you need to do instal install package libxml2-dev for example:
sudo apt-get install libxml2-dev
sudo yum install libxml2-devel
Ref : https://bit.ly/34hOrfG
- New Content published on w3resource:
- Scala Programming Exercises, Practice, Solution
- Python Itertools exercises
- Python Numpy exercises
- Python GeoPy Package exercises
- Python Pandas exercises
- Python nltk exercises
- Python BeautifulSoup exercises
- Form Template
- Composer - PHP Package Manager
- PHPUnit - PHP Testing
- Laravel - PHP Framework