How can the issue of an undefined variable after renaming a file be resolved in PHP?

After renaming a file in PHP, any references to the old file name may cause an "undefined variable" error. To resolve this issue, make sure to update all references to the new file name in your code. 

// Before renaming the file
include 'old_file.php';

// After renaming the file
include 'new_file.php';

Keywords

undefined variable renaming file PHP error resolution

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