[Projeto] button compartilhar do facebook

Simples função para compartilhar post, produtos etc no facebook.

PHP

function Compartilhar($url,$img,$title,$texto){
$href = 'https://www.facebook.com/sharer.php?s=100';
$href .= '&p'.urlencode('[url]').'='.urlencode('http://'.$_SERVER['HTTP_HOST'].'/'.$url.'.html');
$href .= '&p'.urlencode('[images][0]').'='.urlencode('http://'.$_SERVER['HTTP_HOST'].'/'.$img);
$href .= '&p'.urlencode('[title]').'='.urlencode($title);
$href .= '&p'.urlencode('[summary]').'='.urlencode(substr(strip_tags(str_replace('"','',$texto)),0,300).'...');
return $href;
}

<a href="<?php echo Compartilhar($url,$img,$title,$texto); ?>" onClick="fbshow(this.href,'FaceBook','600','400');return false;"><img src="btn_facebook.PNG" alt="Compartilhar produto no Facebook" title="Compartilhe no Facebook"></a>

function fbshow(url, title, w, h){
 var left = (screen.width/2)-(w/2);
 var top = (screen.height/2)-(h/2);
 return window.open(url, title, 'toolbar=no, location=no, directories=no, status=no, menubar=no, scrollbars=no, resizable=yes, copyhistory=no, width='+w+', height='+h+', top='+top+', left='+left);
}

Flw...