What potential issue is the user facing with the script?

The potential issue the user is facing with the script is that the variable $mysqli is not defined before using it in the mysqli_query() function. To solve this issue, the user needs to establish a database connection using mysqli_connect() and assign it to the $mysqli variable before executing any queries. 

// Establish a database connection
$mysqli = mysqli_connect("localhost", "username", "password", "database");

// Check connection
if (!$mysqli) {
    die("Connection failed: " . mysqli_connect_error());
}

// Execute query using the $mysqli variable
$result = mysqli_query($mysqli, "SELECT * FROM table_name");

// Rest of the code goes here

// Close the database connection
mysqli_close($mysqli);

Keywords

syntax error undefined variable missing semicolon PHP parser error variable scope

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