A simple class for interacting with numbers.

Numbers.php

<?php

/**
 * Contains methods for interacting with numbers.
 * 
 * @author Daniel Sposito <daniel.g.sposito@gmail.com>
 */
class Number
{
    /**
	 * Builds an array contain $count number of prime numbers.
	 *
	 * @param int $count The total number of prime numbers to return.
	 *
	 * @return array
	 */
	public static function primes($count)
	{
		$number = 1;
		
		$total_primes = 0;
		while ($total_primes < $count) {
			if (self::isPrime($number)) {
				$primes[] = $number;
				$total_primes++;
			}
			
			$number++;
		}
		
		return $primes;
	}
	
	/**
	 * Determines whether or not a number is prime.
	 *
	 * @param int $number The number to check.
	 *
	 * @return boolean
	 */
	public static function isPrime($number)
	{
		if ($number == 1) {
			return false;
		}
		
		for ($i = 2; $i <= $number; $i++) {
			if ($number != $i && $number % $i == 0) {
				return false;
			}
		}
		
		return true;
	}
}

$count = 100;

echo "First $count Prime Numbers: " . implode(', ', Number::primes($count));