How can PHP be used to retrieve values greater and smaller than a target number from a MySQL database, perform calculations on them, and determine the closest match to the target number?

To retrieve values greater and smaller than a target number from a MySQL database, you can use SQL queries with WHERE clauses to filter the results. Once you have the values, you can perform calculations on them to determine the closest match to the target number. By comparing the absolute differences between each value and the target number, you can find the closest match. 

<?php
$targetNumber = 50;

// Connect to MySQL 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);
}

// Retrieve values greater than target number
$sql = "SELECT * FROM table WHERE value > $targetNumber";
$result_greater = $conn->query($sql);

// Retrieve values smaller than target number
$sql = "SELECT * FROM table WHERE value < $targetNumber";
$result_smaller = $conn->query($sql);

$closestMatch = null;
$closestDifference = PHP_INT_MAX;

// Loop through greater values
while($row = $result_greater->fetch_assoc()) {
    $difference = abs($row['value'] - $targetNumber);
    if($difference < $closestDifference) {
        $closestMatch = $row['value'];
        $closestDifference = $difference;
    }
}

// Loop through smaller values
while($row = $result_smaller->fetch_assoc()) {
    $difference = abs($row['value'] - $targetNumber);
    if($difference < $closestDifference) {
        $closestMatch = $row['value'];
        $closestDifference = $difference;
    }
}

echo "Closest match to target number $targetNumber is: $closestMatch";
$conn->close();
?>

Keywords

PHP MySQL retrieve values calculations closest match

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