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Can you undefine or change a constant in PHP?
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A constant is an identifier (name) for a simple value. The value cannot be changed during the script. A valid constant name starts with a letter or underscore (no $ sign before the constant name).
Changing Value of a const variable through pointerBy assigning the address of the variable to a non-constant pointer, We are casting a constant variable to a non-constant pointer. The compiler will give warning while typecasting and will discard the const qualifier.
Using a constant that's not defined in this version of PHP, or is defined in an extension that's not installed. There are some system-defined constants that only exist in newer versions of PHP, for example the mode option constants for round() such as PHP_ROUND_HALF_DOWN only exist in PHP 5.3 or later. Thanks for share ...
A constant value cannot change during the execution of the script. By default, a constant is case-sensitive. By convention, constant identifiers are always uppercase.
No. Constants are constant.
Reference: php.net/manual/language.constants.php
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