You want to check if a certain constant has been defined in your PHP script. How would you do this?

  • Use the defined() function
  • Use the isset() function
  • Use the empty() function
  • Use the constant() function
To check if a certain constant has been defined in your PHP script, you would use the defined() function. The defined() function takes the name of a constant 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. By using defined(), you can ensure that the constant you are working with is defined and accessible. Learn more: https://www.php.net/manual/en/function.defined.php
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