How can file-wide variables be implemented in PHP for cross-file communication?

File-wide variables can be implemented in PHP for cross-file communication by using the global keyword to declare a variable in one file and access it in another file. This allows the variable to be shared across multiple files without the need for passing it as a parameter to functions or including it in each file separately. 

// file1.php
global $fileWideVariable;
$fileWideVariable = "Hello from file1.php!";

// file2.php
global $fileWideVariable;
echo $fileWideVariable; // Output: Hello from file1.php!

Keywords

global keyword include statement variable scope cross-file communication PHP programming

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