In the context of PHP programming, what steps can be taken to troubleshoot and resolve issues related to variable recognition and usage across different files, as highlighted in the forum thread?

Issue: When using variables across different PHP files, ensure that the variables are properly declared and accessed. To troubleshoot issues related to variable recognition and usage, make sure to include the necessary files using `require` or `include` statements and correctly scope the variables using global keyword or by passing them as arguments to functions. Code snippet: 

// File: file1.php
$variable = "Hello, World!";

// File: file2.php
require 'file1.php';
echo $variable;

Keywords

variable scope include require global keyword namespace

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