What potential issues can arise when passing variables from one PHP file to another for function execution?

One potential issue that can arise when passing variables from one PHP file to another for function execution is variable scope. If the variable is not properly passed or declared as global, it may not be accessible within the function in the second PHP file. To solve this, you can use the global keyword to make the variable accessible within the function. 

// File 1: passing the variable to another PHP file
$var = "Hello";

// Include the second PHP file
include 'file2.php';

// File 2: accessing the variable in the second PHP file
function displayVar() {
    global $var;
    echo $var;
}

// Call the function to display the variable
displayVar();

Keywords

variable scope global keyword include function require function undefined variable

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