Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN: 9780133594140
Author: James Kurose, Keith Ross
Publisher: PEARSON
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PHP
Write a modeMaker function
Write a function modeMaker() that forms a closure such that the function it returns can be used with your reduce() function above to find the mode of an array. The mode of an array is the value that appears the most frequently (so in the $arr above, the mode is 5). To do this, you will need an array called $seen that keeps the count of times an element has been examined At the end of the reduce function, the $seen array should look like the following for the $arr above:
Array ( [10] => 1 [5] => 3 [3] => 1 [1] => 1 [2] => 1 [7] => 1 )
Note that the closure you generate should always be returning the current mode for what it has seen so far (so it will either be the current mode, or the new element passed in). The following is a start for modeMaker:
function modeMaker() { $seen = array(); return function($current, $new) use (&$seen) { // your code that uses $seen goes here }; } $mode = modeMaker(); $arr = array(10, 5, 3, 5, 1, 2, 5, 7, 4); print("Mode: " . reduce($arr, $mode) . "<br />");
Transcribed Image Text:```php
<?php
function modeMaker() {
$seen = array();
return function($current, $new) use (&$seen) {
// your code that uses $seen goes here
};
}
?>
```
**Explanation:**
This code snippet defines a PHP function named `modeMaker`.
- Within this function, an array named `$seen` is initialized to keep track of values.
- The `modeMaker` function returns an anonymous function (a closure) that takes two parameters, `$current` and `$new`.
- The `use` keyword is employed here to allow the anonymous function to access the `$seen` array by reference, enabling it to modify `$seen` and retain the changes across multiple invocations.
- The comment inside the closure indicates where to write the logic that will utilize the `$seen` array.
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