How can one check if a number is already stored in a database using PHP?

To check if a number is already stored in a database using PHP, you can execute a SELECT query to search for the number in the database table. If the query returns a result, it means the number is already stored in the database. You can then use the returned result to determine if the number exists in the database. 

<?php
$number = 12345; // Number to check

// Connect to the database
$connection = mysqli_connect("localhost", "username", "password", "database");

// Check if the number exists in the database
$query = "SELECT * FROM numbers_table WHERE number = $number";
$result = mysqli_query($connection, $query);

if(mysqli_num_rows($result) > 0) {
    echo "Number $number is already stored in the database";
} else {
    echo "Number $number is not stored in the database";
}

// Close the database connection
mysqli_close($connection);
?>

Keywords

PHP database SQL query validation

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