What potential issue is highlighted in the PHP script regarding the use of the variable name "alter"?

The potential issue highlighted in the PHP script regarding the variable name "alter" is that "alter" is a reserved keyword in SQL, and using it as a variable name could lead to conflicts or errors when interacting with a database. To solve this issue, it is recommended to choose a different variable name that is not a reserved keyword in SQL.

// Potential issue highlighted in the PHP script
$alter = "ALTER TABLE users ADD COLUMN email VARCHAR(255)";

// Fix: Use a different variable name that is not a reserved keyword in SQL
$alterQuery = "ALTER TABLE users ADD COLUMN email VARCHAR(255)";