What is the significance of case sensitivity in defining constants in PHP?

Case sensitivity in defining constants in PHP is significant because constants are case-sensitive by default. This means that if a constant is defined with uppercase letters, it must be referenced with uppercase letters throughout the code. To avoid potential issues with case sensitivity, it is recommended to define constants with consistent casing and adhere to that casing when referencing them in the code. 

define("MY_CONSTANT", "This is a constant value");

echo MY_CONSTANT; // Output: This is a constant value

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case sensitivity constants PHP significance defining

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