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How can PHP scripts be optimized to handle large amounts of data processing efficiently?

To optimize PHP scripts for handling large amounts of data processing efficiently, consider using techniques such as caching, indexing databases, optimizing loops, and minimizing database queries. Additionally, utilize functions like "unset()" to free up memory when variables are no longer needed.

php 
// Example of optimizing PHP script for large data processing
// Using caching to reduce database queries

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

// Check if data is already cached
if (!($data = apc_fetch('cached_data'))) {
    // If data is not cached, fetch from database
    $query = "SELECT * FROM large_table";
    $result = mysqli_query($connection, $query);

    // Process data
    $data = array();
    while ($row = mysqli_fetch_assoc($result)) {
        $data[] = $row;
    }

    // Cache data for future use
    apc_store('cached_data', $data);
}

// Use $data for further processing
foreach ($data as $row) {
    // Process each row
}

// Close database connection
mysqli_close($connection);

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