What are some recommendations for handling complex search functionality in PHP and SQL databases?

Complex search functionality in PHP and SQL databases can be handled by constructing dynamic SQL queries based on user input. This involves sanitizing and validating user input to prevent SQL injection attacks, building the query string dynamically based on the search criteria, and executing the query to retrieve the desired results. 

<?php
// Sanitize and validate user input
$searchTerm = isset($_GET['search']) ? $_GET['search'] : '';
$searchTerm = trim($searchTerm);
$searchTerm = mysqli_real_escape_string($conn, $searchTerm);

// Build the dynamic SQL query
$sql = "SELECT * FROM table_name WHERE column_name LIKE '%$searchTerm%'";

// Execute the query and retrieve results
$result = mysqli_query($conn, $sql);

// Loop through the results and display them
while ($row = mysqli_fetch_assoc($result)) {
    echo $row['column_name'];
}
?>

Keywords

PHP SQL databases search functionality optimization indexing

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