How can PHP arrays be effectively utilized for storing and processing user input data on a website?

When processing user input data on a website, PHP arrays can be effectively utilized to store and manipulate the data in a structured manner. By using arrays, you can easily organize the input data, iterate over it to perform operations, and store it in a way that makes it easy to retrieve and display later on the website. 

// Example of storing user input data in an array
$userInput = $_POST['user_input']; // Assuming 'user_input' is the name of the input field in a form
$dataArray = explode(',', $userInput); // Split the input data by commas and store in an array

// Example of iterating over the array and processing the data
foreach ($dataArray as $data) {
    // Perform operations on each data element
    echo "Data: " . $data . "<br>";
}

// Example of accessing specific data in the array
echo "First element: " . $dataArray[0]; // Access the first element in the array

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