Search circular prime in range from 2 to 1000000

circular_prime.php

<?php 
$circular_primes=array();
function is_prime ($num){
	for ($x = 2; $x <= sqrt($num); $x++)
	if (!($num % $x)) return false;
	return true;
}
function is_circular($str){
	$tmp_array=array();
	array_push($tmp_array,$str);
	$str_split=str_split($str);
	for($i=1;$i<count($str_split);$i++){
		$str_split_first=array_shift($str_split);
		array_push($str_split,$str_split_first);
		$d=implode("", $str_split);
		if(is_prime($d)) array_push($tmp_array,$d);
	}
	if(count(str_split($str))==count($tmp_array)){
		return true;
	}else{
		return false;
	}
}
for($i=2;$i<=1000000;$i++){
	if(is_prime($i)){
		if(is_circular($i)){
			if (!in_array($i, $circular_primes)) {
				array_push($circular_primes,$i);
				echo $i.'</br>';
			}
		}
	}
}
echo 'Count of circular prime is '.count($circular_primes);
?>