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Create a PHP Constant

PHP Constant

PHP Constant

In PHP, you can define a constant using the define() function. A constant is a value that cannot be changed during the execution of the script.

Here is the syntax for defining a constant in PHP:

define(name, value, case-insensitive);
  • name : The name of the constant (e.g. MY_CONSTANT)
  • value : The value of the constant (e.g. 42)
  • case-insensitive : Optional boolean value that determines if the constant name should be case-insensitive. Default isfalse.

Here’s an example of how to define a constant in PHP:

define("MY_CONSTANT", 42);

Now, the constant MY_CONSTANT has been defined with a value of 42. You can use this constant throughout your code and it will always have the same value.

Note that constant names are traditionally written in uppercase letters to differentiate them from variables. It’s also common to use underscores to separate words in the constant name (e.g. MY_CONSTANT_NAME).

Once a constant is defined, you can use it like this:


This will output 42.

It’s important to note that constants cannot be redefined or undefined during the execution of the script. Also, constants are global and can be accessed from any part of the script.

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