有没有办法从头部检查当前页面是否为主页？

我的style.php 需要滑块中的帖子数量，但仅在主页上。所以我这样计算我的帖子：

<?php 
$meta_key = \'teaser\';
$posts_per_page = 6;

$sql = "SELECT count(DISTINCT pm.post_id)
    FROM $wpdb->postmeta pm
    JOIN $wpdb->posts p ON (p.ID = pm.post_id)
    WHERE pm.meta_key = \'$meta_key\'
    AND pm.meta_value != \' \'
    AND (p.post_type = \'post\' OR p.post_type = \'page\' OR p.post_type = \'ai1ec_event\')
    AND p.post_status = \'publish\'";

$count = $wpdb->get_var($sql);
if($count > $posts_per_page) {
    $count = $posts_per_page;
}
?>

<link rel="stylesheet" type="text/css" media="all" href="/wordpress/wp-content/themes/roots/style.php?tcount=<?php echo $count;?>" />

这就是风格。php（只是一些相关部分，以展示其工作原理）：

header("Content-Type: text/css"); 
$seconds_to_cache = 86400;
$ts = gmdate("D, d M Y H:i:s", time() + $seconds_to_cache) . " GMT";
header("Expires: $ts");
header("Pragma: cache");
header("Cache-Control: max-age=$seconds_to_cache");

$numTeasers = $_GET[\'tcount\'];

/* ==========================================================================
    Slider Controls
========================================================================== */

$max = $numTeasers;
for ($s = 1; $s <= $max; $s++) {

    $next = $s+1;
    if($next == $max+1){$next = 1;}
    echo "#wdgt_slider #slide".$s.":checked ~ #controls label:nth-child(".$next."){background: url(\'/wordpress/wp-content/themes/roots/assets/img/slider/next.png\') no-repeat scroll 0 0 transparent;display:block;position:absolute;right:0;margin:0 20px 0 0;}";

    $prev = $s-1;
    if($prev == 0){$prev = $max;}
    echo "#wdgt_slider #slide".$s.":checked ~ #controls label:nth-child(".$prev."){background: url(\'/wordpress/wp-content/themes/roots/assets/img/slider/prev.png\') no-repeat scroll 0 0 transparent;display:block;position:absolute;float:left;margin: 0 0 0 20px;}";

    echo "#wdgt_slider #slide".$s.":checked ~ #active label:nth-child(".$s."){color:#c2b29e}";

    echo "#wdgt_slider #slide".$s.":checked ~ #slides #slide-teaser-".$s." .info, #wdgt_slider #slide".$s.":checked ~ #slides #slide-teaser-".$s."{visibility:visible;width:100%;height:auto;opacity:1;}";
}

@import url(“../adventon/style.css”);