How can the use of arrays and functions in PHP improve the efficiency and readability of code for generating dynamic organigrams?

Using arrays and functions in PHP can improve the efficiency and readability of code for generating dynamic organigrams by allowing for a more structured and modular approach. By storing hierarchical data in arrays, we can easily traverse and manipulate the data to generate the organigram. Functions can be used to encapsulate repetitive tasks and make the code more reusable and easier to understand. 

<?php
// Define the hierarchical data in an array
$organigram = [
    'CEO' => [
        'Manager A' => [
            'Employee A1',
            'Employee A2'
        ],
        'Manager B' => [
            'Employee B1',
            'Employee B2'
        ]
    ]
];

// Function to recursively generate the organigram
function generateOrganigram($data) {
    echo '<ul>';
    foreach ($data as $key => $value) {
        echo '<li>' . $key;
        if (is_array($value)) {
            generateOrganigram($value);
        }
        echo '</li>';
    }
    echo '</ul>';
}

// Call the function to generate the organigram
generateOrganigram($organigram);
?>

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