Question

How to find the prime numbers between 1 to 100 in PHP

Answer 1

function isPrime($n) {
    if ($n < 2 || ($n % 2 == 0 && $n != 2)) {
        return 0;
    }
  
    $count = floor(sqrt($n));
    for ($i = 3; $i <= $count; $i += 2) {
        if ($n % $i == 0) {
            return 0;
        }
    }
    return 1;
}
 
     
for ($n = 2; $n <= 100; $n++) { 
    if (isPrime($n)) {
        echo $n . " ";
    }
}

 
 




/*
run:

2 3 5 7 11 13 17 19 23 29 31 37 41 43 47 53 59 61 67 71 73 79 83 89 97 

*/

 

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