Improve human_filesize function, add anchor ids to FAQ and Archive titles

index.php

@@ -67,13 +67,14 @@ function human_filesize($bytes, $decimals = 2)
         return '';
     }
 
-    $sz     = 'BKMGTP';
-    $factor = floor((strlen($bytes) - 1) / 3);
-    $suff   = @$sz[$factor];
-    if ($suff != 'B') {
-        $suff .= 'iB';
+    $sizes  = 'BKMGTP';
+    $factor = floor((strlen($bytes) - 1) / 3) ?: 0;
+    $suffix = @$sizes[$factor];
+    if ($suffix === 'B') {
+        return "{$bytes}B";
     }
-    return sprintf("%.{$decimals}f", $bytes / pow(1024, $factor)) . $suff;
+
+    return sprintf("%.{$decimals}f", $bytes / (1024 ** $factor)) . "{$suffix}iB";
 }
 
 function get_dl_link($flavor, $version, $file = null)
@@ -162,7 +163,7 @@ save_binaries_json($files, $stable);
         </div>
     </div>
 
-    <h2>Frequently Asked Questions</h2>
+    <h2 id="faq">Frequently Asked Questions</h2>
     <div class="container">
         <h3>Which version should I choose?</h3>
         There is probably only one version that's going to run on your device. Run <code><b class="command">uname</b> -m</code> and choose the version that's named similar to the output.
@@ -192,7 +193,7 @@ save_binaries_json($files, $stable);
         Yes, but please use <a href="/binaries.json">this JSON representation</a> in stead of this website. Also, please note that excessive polling might get you banned.
     </div>
 
-    <h2>Archive</h2>
+    <h2 id="archive">Archive</h2>
     <a href="?show-unstable">(show unstable builds)</a>
     <div id="view" class="view-details view-size-20">
         <ul id="items" class="clearfix">