How can global variables impact the functionality of code that uses create_function in PHP scripts?

Global variables can impact the functionality of code that uses create_function in PHP scripts because the anonymous function created by create_function does not inherit the scope of the calling code. This means that global variables may not be accessible within the anonymous function, leading to unexpected behavior or errors. To solve this issue, you can pass any necessary variables as arguments to the anonymous function.

$globalVariable = 'Hello';

$myFunction = create_function('$arg', 'global $globalVariable; return $globalVariable . $arg;');

echo $myFunction(' World');