How can you ensure proper variable scope and access when including files in PHP?

When including files in PHP, it's important to ensure proper variable scope and access by using the `include` or `require` functions instead of directly including the file contents. This way, variables defined in the included file will be accessible in the including file, but variables defined in the including file will not be accessible in the included file. To prevent variable conflicts, it's recommended to use functions or classes to encapsulate code and variables. 

// Including file with proper variable scope
include 'included_file.php';

// Code in included_file.php
$includedVariable = "I am from included file";
echo $includedVariable;

Keywords

variable scope include files PHP global keyword namespace

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