What potential issue could arise when defining variables in one PHP file and including them in another?

One potential issue that could arise when defining variables in one PHP file and including them in another is variable scope. If the variables are defined within a function or conditional block in the first file, they may not be accessible in the second file. To solve this issue, you can define the variables as global variables in the first file so that they can be accessed in the second file. 

// File 1: variables.php
$globalVar = "I am a global variable";

// File 2: index.php
include 'variables.php';

echo $globalVar; // Output: I am a global variable

Keywords

variable scope include require global keyword namespace

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