08. List Prime Numbers..php

/*  8. Here is the Program to list the first 15 prime numbers.	*/

<?php  
$count = 0;  
$num = 2;  

while ($count < 15 )  

{  

$div_count=0;  

for ( $i=1; $i<=$num; $i++)  

{  

if (($num%$i)==0)  

{  

$div_count++;  

}  

}  

if ($div_count<3)  

{  

echo $num." , ";  

$count=$count+1;  

}  

$num=$num+1; 

}  
?>