How can PHP developers ensure that variables declared in included files from a remote URL are accessible in the main script?

When including files from a remote URL in PHP, variables declared in those files may not be accessible in the main script due to scope issues. To ensure that these variables are accessible, developers can use the `extract()` function in PHP to extract the variables from the included file into the global scope of the main script.

// Include the remote file
include 'http://example.com/remote-file.php';

// Use extract() to import variables into the global scope
extract(get_defined_vars());

// Now the variables declared in remote-file.php are accessible in the main script
echo $variableName;