The **`count()`** method of the `DS\Vector` class in PHP returns the number of values present in a vector.

The process is illustrated below:

The prototype of the `count()` method is shown below:

```php
int public Ds\Vector::count( void )
```
<h2>Parameters</h2>

The `count()` method does not accept any parameters.

<h2>Return value</h2>

The `count()` method returns an integer that represents the number of values present in the vector.

<h2>Example</h2>

The code below shows how the `count()` method works in PHP:

<?php

// initialize vectors
$firstVector = new \Ds\Vector([1, 2, 3, 4, 5]);
$secondVector = new \Ds\Vector(["Alice", "Bob", "Charles"]);

// print vectors and their counts
print("Printing first vector:\n");
print_r($firstVector);

print("The count of the first vector is: ");
print(count($firstVector));

print("\n\nPrinting second vector:\n");
print_r($secondVector);

print("The count of the second vector is: ");
print(count($secondVector));

?>

The above code produces the following output:

```php
Printing first vector:
Ds\Vector Object
(
[0] => 1
[1] => 2
[2] => 3
[3] => 4
[4] => 5
)
The count of the first vector is: 5

Printing second vector:
Ds\Vector Object
(
[0] => Alice
[1] => Bob
[2] => Charles
)
The count of the second vector is: 3
```

> **Note**: To run this program, you need to install [Data Structures](https://www.php.net/manual/en/book.ds.php) for PHP on your local machine.

<h2>Explanation</h2>

First, two vectors are initialized: `firstVector` and `secondVector`. `firstVector` contains $5$ integer values, whereas `secondVector` contains $3$ string values.

The code proceeds to use the `count()` method in lines $12$ and $18$ to obtain the number of values in `firstVector` and `secondVector`, respectively. The counts are printed along with their respective vectors.



What is the DS\Vector count() method in PHP?

The DS\Vector count() method in PHP returns the number of values in a vector, with no parameters needed.