Generating prime numbers

prime_cmd.php

<?php

set_time_limit(-1);

$primes = json_decode(file_get_contents("prime.json"));

while (TRUE)
{
	$i = $primes[count($primes) -1] + 1;
	$ip = $i + 999;
	$num_primes = count($primes);

	if($i % 2 === 0)
	{
		++$i;
		++$ip;
	}

	for($i;$i < $ip;$i+=2)
	{
		$prime = TRUE;

		foreach($primes as $p)
		{
			//Divisible by another prime…it's a composite
			if($i % $p === 0)
			{
				$prime = FALSE;
				break;
			}
		}

		if($prime === TRUE)
		{
			$primes[] = $i;
			$num_primes++;
		}
	}

	file_put_contents("prime.json", json_encode($primes));

	echo "Generated {$num_primes} primes \n";
}