What potential pitfalls should be considered when creating links to display specific user entries based on ID in PHP?

When creating links to display specific user entries based on ID in PHP, potential pitfalls to consider include ensuring that the ID provided is valid and exists in the database to prevent SQL injection attacks, handling cases where the ID is not found to display a proper error message, and properly sanitizing and validating the ID input to prevent unexpected behavior. 

<?php
// Assuming $id contains the ID value from the URL parameter
$id = $_GET['id'];

// Validate the ID input to prevent SQL injection
if (!is_numeric($id) || $id <= 0) {
    die("Invalid ID provided.");
}

// Query the database to check if the user entry with the given ID exists
// Replace 'your_table_name' with the actual table name
$query = "SELECT * FROM your_table_name WHERE id = $id";
$result = mysqli_query($conn, $query);

if (mysqli_num_rows($result) == 0) {
    die("User entry not found.");
}

// Proceed with displaying the user entry based on the ID
// Display code goes here
?>

Keywords

SQL injection XSS attacks data validation error handling database queries

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