How can you call a function from an external PHP file in another PHP file?

To call a function from an external PHP file in another PHP file, you can use the `include` or `require` statement to include the external file containing the function definition. Once the file is included, you can directly call the function in the current PHP file as if it were defined within the file itself. 

// Include the external PHP file containing the function definition
include 'external_file.php';

// Call the function from the external file
function_name();

Keywords

PHP function call external file include require

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