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PHP program to list prime numbers

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;

} 
?> 
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