php - Do-While Loop with Multiple Conditions -

can do-while loop have multiple conditions? if so, can't figure out why code below failing on first condition.

functions used...

function gcf($a,$b) { $a = abs($a); $b = abs($b); if( $a < $b) list($b,$a) = array($a,$b); if( $b == 0) return $a; $r = $a % $b; while($r > 0) {     $a = $b;     $b = $r;     $r = $a % $b; } return $b; }   function factors($n){ $factors_array = array(); ($x = 1; $x <= sqrt(abs($n)); $x++) {     if ($n % $x == 0)     {         $z = $n/$x;          array_push($factors_array, $x, $z);     } } return $factors_array; } 

code...

$a = $b;  do{     $a = mt_rand(8, 100);     $a_factors_array = factors($a);      $b = mt_rand(8, 100);     $b_factors_array = factors($b);  } while ($a == $b && count($a_factors_array) < 4 && count($b_factors_array) < 4 && gcf($a, $b) == 1);  echo $a . '<br>'; echo $b . '<br>';  echo count($a_factors_array) . '<br>'; echo count($b_factors_array) . '<br>';  echo gcf($a, $b) . '<br>'; 

i keep getting numbers $a , $b have less 4 factors , have gcf of 1. ideas?

you'll need || instead of &&. want repeat loop long any 1 of conditions met. loop repeated if all of conditions met.