8/4/2019 05 - Constants

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PHP Constants

A constant is a placeholder for the value that can be referenced in the code later.

A constant can be created by using PHPs in-built function define() as:

define(CONSTANT_NAME,value,boolean_value);

The third Boolean argument can be used to determine whether constant name is

case-sensitive or not. If boolean value is set to true, the constant name is case-

insensitive. By default it is case-sensitive.

Let us see a script below to demonstrate usage of constant:

Above code snippet will output: Welcome sourabh. The period (.) is a used to

concatenate text in php.

Rules for naming constants:

1. Constant names are typically named in capital letters (lowercase are also

allowed).

2. Constant name must begin with letter or underscore (_).

3. It must not begin with number.

Once a constant is defined, its value cannot be changed or altered.

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