In PHP, the ______ function checks if a constant with a given name exists.
- defined()
- exists()
- declared()
- assigned()
In PHP, the defined() function checks if a constant with a given name exists. It takes a constant name as an argument and returns true if the constant is defined, and false otherwise. This function is useful when you need to determine if a constant has been defined before accessing its value to avoid potential errors. Using the defined() function helps ensure that you are working with valid and defined constants. Learn more: https://www.php.net/manual/en/function.defined.php
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