<?php

/**

* Formats a collection into a string representation.

*

* @param array $collection The collection to format.

* @param array $defaults An associative array of default values.

* @return string The formatted string representation of the collection.

*/

function formatCollection(array $collection, array $defaults = []): string

{

$output = '';

foreach ($collection as $key => $value) {

$formattedKey = htmlspecialchars(strval($key)); // Escape key for safety

$defaultValue = $defaults[$key] ?? ''; // Get default value or empty string

$output .= sprintf(

' %s: %s' . PHP_EOL,

$formattedKey,

htmlspecialchars(strval($value))

);

}

return $output;

}

/**

* Example Usage (for testing)

*/

$myCollection = [

'name' => 'John Doe',

'age' => 30,

'city' => 'New York',

];

$defaultValues = [

'occupation' => 'Unknown',

'country' => 'USA',

'email' => 'noemail@example.com',

];

$formattedOutput = formatCollection($myCollection, $defaultValues);

echo $formattedOutput;

?>