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Showing results for tags 'prime number'.
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I have written a function to check whether any number is prime or not. Is it okay? or I can better it by any means? function isPrime($num){ $number = array(); for ($i=2; $i <= $num; $i++){ if(($num%2)==0){ continue; } if (($num%$i)==0){ break; } $number[]=$i; } /* * how I back calculate to make it successful foreach ($number as $key => $value) { echo "$key = $value <br>"; } echo count($number); */ if (count($number)== ($num-2)) { echo 'it is prime'; } else { echo 'not prime'; } } isPrime(101112345909);
