What are some best practices for dynamically creating and filling arrays in PHP based on user input?

When dynamically creating and filling arrays in PHP based on user input, it is important to validate and sanitize the user input to prevent security vulnerabilities like SQL injection or cross-site scripting. Additionally, it is recommended to use built-in PHP functions like array_push() or [] syntax for adding elements to the array efficiently. Lastly, consider using loops or conditional statements to iterate over the user input and populate the array accordingly. 

// Example of dynamically creating and filling an array based on user input

$userInput = $_POST['user_input']; // Assuming user input is received via POST method

// Validate and sanitize user input
$cleanInput = filter_var($userInput, FILTER_SANITIZE_STRING);

// Initialize an empty array
$dataArray = [];

// Split user input by comma and add each element to the array
$inputArray = explode(',', $cleanInput);
foreach ($inputArray as $input) {
    $dataArray[] = $input;
}

// Output the populated array
print_r($dataArray);

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