$position=11; // Define how many characters you want to display.

$message="Jooria Refresh Your Website";
$post = substr($message,$position,1); // Find what is the last 
character displaying.
We find it by getting only last
 one character from your display message.

if($post !=" "){ // In this step,
 if last character is not " "(space) do this step .

// Find until we found that last character is " "(space)
// by $position+1 (14+1=15, 15+1=16 until
 we found " "(space) that mean character 20)
while($post !=" "){
$i=1;
$position=$position+$i;

$message="Jooria Refresh Your Website";
$post = substr($message,$position,1);
}

}

$post = substr($message,0,$position); // Display your message
echo $post;
echo "...";
?>