What is the get_defined_functions method in PHP?

The get_defined_functions method can be used to get a list of user-defined functions and built-in functions.

Syntax

get_defined_functions(bool $exclude_disabled = true): array

We can use the exclude_disabled argument to include disabled functions from the returned functions. By default, the disabled functions are excluded.

This method returns a multidimensional array with a user-defined function with key user and a built-in function with key internal.

Code

<?php 
  function test(){
    echo "hi";
  }
  $arr = get_defined_functions();
  echo "User defined in Functions\n";
  var_export($arr['user']);
  echo "\n\nBuild in Functions\n"; 
  var_export($arr['internal']);
?>

In the code above, we created a function with the name test. Then we called the get_defined_functions method to get the list of user-defined and built-in functions.

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