diff --git a/core/imageboard.pack.php b/core/imageboard.pack.php
index ddfdd1d6..58828416 100644
--- a/core/imageboard.pack.php
+++ b/core/imageboard.pack.php
@@ -667,7 +667,7 @@ class Image {
 	/**
 	 * Send list of metatags to be parsed.
 	 *
-	 * @param [] $metatags
+	 * @param string[] $metatags
 	 * @param int $image_id
 	 */
 	public function parse_metatags($metatags, $image_id) {
@@ -876,7 +876,7 @@ class Image {
 		 * Merge all the image metadata searches into one generic querylet
 		 * and append to the base querylet with "AND blah"
 		 */
-		if($img_querylets) {
+		if(!empty($img_querylets)) {
 			$n = 0;
 			$img_sql = "";
 			$img_vars = array();
@@ -950,11 +950,11 @@ class Image {
 
 		assert('$positive_tag_id_array || $negative_tag_id_array');
 		$wheres = array();
-		if ($positive_tag_id_array) {
+		if (!empty($positive_tag_id_array)) {
 			$positive_tag_id_list = join(', ', $positive_tag_id_array);
 			$wheres[] = "tag_id IN ($positive_tag_id_list)";
 		}
-		if ($negative_tag_id_array) {
+		if (!empty($negative_tag_id_array)) {
 			$negative_tag_id_list = join(', ', $negative_tag_id_array);
 			$wheres[] = "tag_id NOT IN ($negative_tag_id_list)";
 		}
diff --git a/core/page.class.php b/core/page.class.php
index 9b60c99c..3d02bbe6 100644
--- a/core/page.class.php
+++ b/core/page.class.php
@@ -290,7 +290,7 @@ class Page {
 				#	header("Cache-control: no-cache");
 				#	header('Expires: ' . gmdate('D, d M Y H:i:s', time() - 600) . ' GMT');
 				#}
-				if($this->get_cookie("flash_message")) {
+				if($this->get_cookie("flash_message") !== null) {
 					$this->add_cookie("flash_message", "", -1, "/");
 				}
 				usort($this->blocks, "blockcmp");
diff --git a/core/util.inc.php b/core/util.inc.php
index 274219e8..94cf1eb0 100644
--- a/core/util.inc.php
+++ b/core/util.inc.php
@@ -79,7 +79,7 @@ function sql_escape($input) {
 /**
  * Turn all manner of HTML / INI / JS / DB booleans into a PHP one
  *
- * @param $input
+ * @param mixed $input
  * @return bool
  */
 function bool_escape($input) {
@@ -679,7 +679,7 @@ function captcha_check() {
 		else {
 			session_start();
 			$securimg = new Securimage();
-			if($securimg->check($_POST['captcha_code']) == FALSE) {
+			if($securimg->check($_POST['captcha_code']) === false) {
 				log_info("core", "Captcha failed (Securimage)");
 				return false;
 			}
@@ -736,7 +736,7 @@ function getMimeType($file, $ext="", $list=false) {
 		'mp4' => 'video/mp4', 'ogv' => 'video/ogg', 'webm' => 'video/webm'
 	);
 
-	if ($list == true){ return $exts; }
+	if ($list === true){ return $exts; }
 
 	if (isset($exts[$ext])) { return $exts[$ext]; }
 
@@ -831,7 +831,7 @@ function get_memory_limit() {
 			// Shimmie wants more memory than what PHP is currently set for.
 
 			// Attempt to set PHP's memory limit.
-			if ( ini_set("memory_limit", $shimmie_limit) === FALSE ) {
+			if ( ini_set("memory_limit", $shimmie_limit) === false ) {
 				/*  We can't change PHP's limit, oh well, return whatever its currently set to */
 				return $memory;
 			}
diff --git a/ext/index/theme.php b/ext/index/theme.php
index a574555b..ecc0b496 100644
--- a/ext/index/theme.php
+++ b/ext/index/theme.php
@@ -1,7 +1,7 @@
 <?php
 
 class IndexTheme extends Themelet {
-	private $page_number, $total_pages, $search_terms;
+	protected $page_number, $total_pages, $search_terms;
 
 	/**
 	 * @param int $page_number