What are the potential pitfalls of using define() in PHP for defining constants?

One potential pitfall of using define() in PHP for defining constants is that it allows for constant redefinition, which can lead to unexpected behavior in your code. To prevent this issue, you can use the defined() function to check if a constant has already been defined before defining it. 

if (!defined('CONSTANT_NAME')) {
    define('CONSTANT_NAME', 'constant_value');
}

Keywords

define constants PHP scope redefinition

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