How can PHP scripts be utilized to compare a URL with database records for link validity?

To compare a URL with database records for link validity, you can create a PHP script that queries the database for existing URLs and then compares the input URL with the records. If a match is found, the link is considered valid. 

<?php

// Connect to the database
$servername = "localhost";
$username = "username";
$password = "password";
$dbname = "database";

$conn = new mysqli($servername, $username, $password, $dbname);

// Check connection
if ($conn->connect_error) {
    die("Connection failed: " . $conn->connect_error);
}

// Input URL to check
$input_url = "https://www.example.com";

// Query the database for existing URLs
$sql = "SELECT * FROM links WHERE url = '$input_url'";
$result = $conn->query($sql);

if ($result->num_rows > 0) {
    echo "Link is valid";
} else {
    echo "Link is not valid";
}

// Close the connection
$conn->close();

?>

Keywords

PHP URL comparison database records link validity script utilization

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