diff --git a/phpdotnet/phd/Config.php b/phpdotnet/phd/Config.php
index 62cf5821..b12aabdf 100644
--- a/phpdotnet/phd/Config.php
+++ b/phpdotnet/phd/Config.php
@@ -173,7 +173,7 @@ public static function setColor_output($color_output)
         self::$optionArray['color_output'] = $color_output;
     }
 
-    public static function set_color_output($color_output)
+    public static function set_color_output()
     {
         trigger_error('Use setColor_output()', E_USER_DEPRECATED);
     }
diff --git a/phpdotnet/phd/Format.php b/phpdotnet/phd/Format.php
index f59e6a02..d5a217a1 100644
--- a/phpdotnet/phd/Format.php
+++ b/phpdotnet/phd/Format.php
@@ -312,7 +312,6 @@ public function getFormatName() {
 
     /* Buffer where append data instead of the standard stream (see format's appendData()) */
     final public function parse($xml) {
-        $parsed = "";
         $reader = new Reader();
         $render = new Render();
 
@@ -468,7 +467,7 @@ public function initRow() {
     }
     public function getEntryOffset(array $attrs) {
         $curr = $this->TABLE["next_colnum"];
-        foreach($this->TABLE["colspec"] as $col => $spec) {
+        foreach($this->TABLE["colspec"] as $spec) {
             if ($spec["colname"] == $attrs["colname"]) {
                 $colnum = $spec["colnum"];
                 $this->TABLE["next_colnum"] += $colnum-$curr;
@@ -479,7 +478,7 @@ public function getEntryOffset(array $attrs) {
     }
     public function colspan(array $attrs) {
         if (isset($attrs["namest"])) {
-            foreach($this->TABLE["colspec"] as $colnum => $spec) {
+            foreach($this->TABLE["colspec"] as $spec) {
                 if ($spec["colname"] == $attrs["namest"]) {
                     $from = $spec["colnum"];
                     continue;
diff --git a/phpdotnet/phd/Format/Abstract/PDF.php b/phpdotnet/phd/Format/Abstract/PDF.php
index 40042e15..14f0589c 100644
--- a/phpdotnet/phd/Format/Abstract/PDF.php
+++ b/phpdotnet/phd/Format/Abstract/PDF.php
@@ -79,7 +79,6 @@ class PdfWriter {
     const LINE_SPACING = 2; // nb of points between two lines
     const INDENT_SPACING = 10; // nb of points for indent
     const DEFAULT_SHIFT = 20; // default value (points) for shifted paragraph
-    private $SCALE; // nb of points for 1 centimeter
     private $PAGE_WIDTH; // in points
     private $PAGE_HEIGHT; // in points
 
@@ -94,7 +93,6 @@ class PdfWriter {
     private $currentFontColor;
     private $fonts;
     private $oldFonts = array();
-    private $text;
 
     private $vOffset = 0;
     private $hOffset = 0;
@@ -142,9 +140,9 @@ function __construct($pageWidth = 210, $pageHeight = 297, Config $config) {
         $this->haruDoc->setPagesConfiguration(2);
 
     	// Page format
-    	$this->SCALE = 72/25.4;
-    	$this->PAGE_WIDTH = $pageWidth * $this->SCALE;
-    	$this->PAGE_HEIGHT = $pageHeight * $this->SCALE;
+    	$scale = 72/25.4;
+    	$this->PAGE_WIDTH = $pageWidth * $scale;
+    	$this->PAGE_HEIGHT = $pageHeight * $scale;
 
     	// Set fonts
     	$this->fonts["Helvetica"] = $this->haruDoc->getFont("Helvetica", "WinAnsiEncoding");
diff --git a/phpdotnet/phd/Index.php b/phpdotnet/phd/Index.php
index 3a82ea9b..620da3c4 100644
--- a/phpdotnet/phd/Index.php
+++ b/phpdotnet/phd/Index.php
@@ -343,7 +343,7 @@ public function format_chunk($open, $name, $attrs, $props) {
             return false;
         }
         if (array_pop($this->isChunk)) {
-            $lastchunk = array_pop($this->chunks);
+            array_pop($this->chunks);
             $this->currentchunk = end($this->chunks);
             $this->appendID();
         }
diff --git a/phpdotnet/phd/MediaManager.php b/phpdotnet/phd/MediaManager.php
index 09a73e4c..b22ec2c9 100644
--- a/phpdotnet/phd/MediaManager.php
+++ b/phpdotnet/phd/MediaManager.php
@@ -127,7 +127,7 @@ public function findFile($filename, $allowfallback = true)
         );
 
         $foundfile = false;
-        foreach($sourcefilenames as $pathoffset => $filenameinfo) {
+        foreach($sourcefilenames as $filenameinfo) {
             // Look for current language specific file.
             if (file_exists($testingfile = $this->relative_source_path . $filenameinfo[0] . $filenameinfo[1])) {
                 $foundfile = $testingfile;
diff --git a/phpdotnet/phd/Options/Handler.php b/phpdotnet/phd/Options/Handler.php
index 11388c40..311fc246 100644
--- a/phpdotnet/phd/Options/Handler.php
+++ b/phpdotnet/phd/Options/Handler.php
@@ -74,7 +74,7 @@ public function option_f(string $k, mixed $v): array
     public function option_format(string $k, mixed $v): array
     {
         $formats = [];
-        foreach((array)$v as $i => $val) {
+        foreach((array)$v as $val) {
             if (!in_array($val, $formats)) {
                 $formats[] = $val;
             }
@@ -319,7 +319,7 @@ public function option_s(string $k, mixed $v): array
     public function option_skip(string $k, mixed $v): array
     {
         $skip_ids = $this->config->skip_ids();
-        foreach((array)$v as $i => $val) {
+        foreach((array)$v as $val) {
             $recursive = true;
             if (strpos($val, "=") !== false) {
                 list($val, $recursive) = explode("=", $val);
@@ -370,7 +370,7 @@ public function option_verbose(string $k, mixed $v): array
     {
         static $verbose = 0;
 
-        foreach((array)$v as $i => $val) {
+        foreach((array)$v as $val) {
             foreach(explode("|", $val) as $const) {
                 if (defined($const)) {
                     $verbose |= (int)constant($const);
@@ -452,7 +452,7 @@ public function option_color(string $k, mixed $v): array
     public function option_css(string $k, mixed $v): array
     {
         $styles = [];
-        foreach((array)$v as $key => $val) {
+        foreach((array)$v as $val) {
             if (!in_array($val, $styles)) {
                 $styles[] = $val;
             }
@@ -474,7 +474,7 @@ public function option_k(string $k, mixed $v): array
     public function option_packagedir(string $k, mixed $v): array
     {
         $packages = $this->config->package_dirs();
-        foreach((array)$v as $key => $val) {
+        foreach((array)$v as $val) {
             if ($path = realpath($val)) {
                 if (!in_array($path, $packages)) {
                     $packages[] = $path;
diff --git a/phpdotnet/phd/PI/PHPDOCHandler.php b/phpdotnet/phd/PI/PHPDOCHandler.php
index 99191520..fa6859b4 100644
--- a/phpdotnet/phd/PI/PHPDOCHandler.php
+++ b/phpdotnet/phd/PI/PHPDOCHandler.php
@@ -26,7 +26,6 @@ public function parse($target, $data) {
                     case "function":
                     case "refentry":
                         $tmp = $this->format->getRefs();
-                        $ret   = "";
                         $refs = array();
                         $info = array();
                         foreach($tmp as $id) {
diff --git a/phpdotnet/phd/Package/Generic/PDF.php b/phpdotnet/phd/Package/Generic/PDF.php
index 04af5255..407dfb46 100644
--- a/phpdotnet/phd/Package/Generic/PDF.php
+++ b/phpdotnet/phd/Package/Generic/PDF.php
@@ -771,7 +771,6 @@ public function format_entry($open, $name, $attrs, $props) {
         if ($open) {
             $dbattrs = Format::getColspec($attrs[Reader::XMLNS_DOCBOOK]);
             $align = (isset($dbattrs["align"]) ? $dbattrs["align"] : $align);
-            $retval = "";
             if (isset($dbattrs["colname"])) {
                 for($i=Format::getEntryOffset($dbattrs); $i>0; --$i) {
                     $this->pdfDoc->add(PdfWriter::TABLE_ENTRY, array(1, 1, $align));
@@ -995,7 +994,6 @@ public function format_initializer($open, $name, $attrs) {
     public function format_footnoteref($open, $name, $attrs, $props) {
         if ($open) {
             $linkend = $attrs[Reader::XMLNS_DOCBOOK]["linkend"];
-            $found = false;
             foreach($this->cchunk["footnote"] as $k => $note) {
                 if ($note["id"] === $linkend) {
                     $this->pdfDoc->setFont(PdfWriter::FONT_NORMAL, 12, array(0,0,1));
@@ -1031,7 +1029,7 @@ public function format_footnote($open, $name, $attrs, $props) {
     }
 
     public function format_co($open, $name, $attrs, $props) {
-        if (($open || $props["empty"]) && isset($attrs[Reader::XMLNS_XML]["id"]) && $id = $attrs[Reader::XMLNS_XML]["id"]) {
+        if (($open || $props["empty"]) && isset($attrs[Reader::XMLNS_XML]["id"]) && $attrs[Reader::XMLNS_XML]["id"]) {
             $co = ++$this->cchunk["co"];
             $this->pdfDoc->setFont(PdfWriter::FONT_NORMAL, 12, array(0,0,1));
             if (isset($attrs[Reader::XMLNS_DOCBOOK]["linkends"]) && $linkends = $attrs[Reader::XMLNS_DOCBOOK]["linkends"]) {
diff --git a/phpdotnet/phd/Package/Generic/TocFeed.php b/phpdotnet/phd/Package/Generic/TocFeed.php
index f6a85f48..a7ca9eb2 100644
--- a/phpdotnet/phd/Package/Generic/TocFeed.php
+++ b/phpdotnet/phd/Package/Generic/TocFeed.php
@@ -357,7 +357,7 @@ protected function createAtomToc($id)
 
         $toc  = '';
         $date = $this->date;
-        foreach ($chunks as $junk => $chunkid) {
+        foreach ($chunks as $chunkid) {
             $long  = $this->getLongDescription($chunkid);
             $short = $this->getShortDescription($chunkid);
             $id    = $this->idprefix . $chunkid;
diff --git a/phpdotnet/phd/Package/Generic/XHTML.php b/phpdotnet/phd/Package/Generic/XHTML.php
index 59beca28..067c775e 100644
--- a/phpdotnet/phd/Package/Generic/XHTML.php
+++ b/phpdotnet/phd/Package/Generic/XHTML.php
@@ -676,7 +676,6 @@ public function format_suppressed_text($value, $tag) {
     }
 
     public function format_link($open, $name, $attrs, $props) {
-        $link = null;
         if ($open) {
             $link = $class = $content = "";
 
@@ -855,7 +854,6 @@ public function format_container_chunk_below($open, $name, $attrs, $props) {
         }
 
         $toc = '<ol>';
-        $desc = "";
         if (!in_array($id, $this->TOC_WRITTEN ?? [])) {
             $toc = $this->createTOC($id, $name, $props);
         }
@@ -1419,7 +1417,6 @@ public function format_fieldsynopsis_varname($open, $name, $attrs) {
     public function format_footnoteref($open, $name, $attrs, $props) {
         if ($open) {
             $linkend = $attrs[Reader::XMLNS_DOCBOOK]["linkend"];
-            $found = false;
             foreach($this->cchunk["footnote"] as $k => $note) {
                 if ($note["id"] === $linkend) {
                     return '<a href="#fnid' .$note["id"]. '"><sup>[' .($k + 1). ']</sup></a>';
diff --git a/phpdotnet/phd/Package/PEAR/ChunkedXHTML.php b/phpdotnet/phd/Package/PEAR/ChunkedXHTML.php
index 49393226..c9fd2136 100755
--- a/phpdotnet/phd/Package/PEAR/ChunkedXHTML.php
+++ b/phpdotnet/phd/Package/PEAR/ChunkedXHTML.php
@@ -100,7 +100,6 @@ public function update($event, $val = null) {
     */
     public function header($id) {
         $title = $this->getShortDescription($id);
-        $lang = $this->config->language();
         static $cssLinks = null;
         if ($cssLinks === null) {
             $cssLinks = $this->createCSSLinks();
diff --git a/phpdotnet/phd/Package/PEAR/Web.php b/phpdotnet/phd/Package/PEAR/Web.php
index 7f885f8b..e8508891 100755
--- a/phpdotnet/phd/Package/PEAR/Web.php
+++ b/phpdotnet/phd/Package/PEAR/Web.php
@@ -124,7 +124,6 @@ public function header($id)
     public function footer($id)
     {
         $ext = $this->ext;
-        $parent = Format::getParent($id);
 
         return '<?php manualFooter("'
             . $this->getFilename($id) . $ext . '", '
diff --git a/phpdotnet/phd/Package/PHP/ChunkedXHTML.php b/phpdotnet/phd/Package/PHP/ChunkedXHTML.php
index d331fb01..5fecfea7 100644
--- a/phpdotnet/phd/Package/PHP/ChunkedXHTML.php
+++ b/phpdotnet/phd/Package/PHP/ChunkedXHTML.php
@@ -2,8 +2,6 @@
 namespace phpdotnet\phd;
 
 class Package_PHP_ChunkedXHTML extends Package_PHP_Web {
-    private $nav = "";
-
     public function __construct(Config $config) {
         parent::__construct($config);
         $this->registerFormatName("PHP-Chunked-XHTML");
@@ -30,7 +28,6 @@ public function header($id) {
  </head>
  <body class="docs">
 HEADER;
-        $next = $prev = $up = array("href" => null, "desc" => null);
         $nextLink = $prevLink = $upLink = '';
         if ($prevId = Format::getPrevious($id)) {
             $prev = array(
diff --git a/phpdotnet/phd/Package/PHP/HowTo.php b/phpdotnet/phd/Package/PHP/HowTo.php
index b7f9082d..36051b42 100644
--- a/phpdotnet/phd/Package/PHP/HowTo.php
+++ b/phpdotnet/phd/Package/PHP/HowTo.php
@@ -40,7 +40,6 @@ public function header($id) {
         $parent = Format::getParent($id);
         $next = $prev = $up = array(null, null);
         if ($parent && $parent != "ROOT") {
-            $siblings = Format::getChildren($parent);
             if ($nextId = Format::getNext($id)) {
                 $next = array(
                     Format::getFilename($nextId) . $this->getExt(),
diff --git a/phpdotnet/phd/Package/PHP/KDevelop.php b/phpdotnet/phd/Package/PHP/KDevelop.php
index 8541102b..13e766de 100644
--- a/phpdotnet/phd/Package/PHP/KDevelop.php
+++ b/phpdotnet/phd/Package/PHP/KDevelop.php
@@ -139,7 +139,6 @@ public function format_tocsect1($open, $name, $attrs) {
     public function format_tocsect2($open, $name, $attrs) {
         if (!isset($attrs[Reader::XMLNS_XML]["id"])) return "";
         $id = $attrs[Reader::XMLNS_XML]["id"];
-        $hasChild = (count(Format::getChildren($id)) > 0);
         if ($open) {
             $name = htmlspecialchars(Format::getShortDescription($id), ENT_QUOTES, 'UTF-8');
             $url = (Format::getFilename($id) ? Format::getFilename($id) : $id) . $this->getExt();
diff --git a/phpdotnet/phd/Package/PHP/Manpage.php b/phpdotnet/phd/Package/PHP/Manpage.php
index a69e89b1..929e0ec2 100644
--- a/phpdotnet/phd/Package/PHP/Manpage.php
+++ b/phpdotnet/phd/Package/PHP/Manpage.php
@@ -73,7 +73,7 @@ public function header($index) {
     public function format_chunk($open, $name, $attrs, $props) {
         return parent::format_chunk($open, $name, $attrs, $props);
     }
-    public function format_class_title_text($value, $tag) {
+    public function format_class_title_text($value) {
         $this->cchunk["funcname"][] = $this->toValidName(trim($value));
     }
 
diff --git a/phpdotnet/phd/Package/PHP/PDF.php b/phpdotnet/phd/Package/PHP/PDF.php
index f80ae792..8a528286 100644
--- a/phpdotnet/phd/Package/PHP/PDF.php
+++ b/phpdotnet/phd/Package/PHP/PDF.php
@@ -79,8 +79,6 @@ class Package_PHP_PDF extends Package_Generic_PDF {
 
     );
 
-    private   $acronyms = array();
-
     /* Common properties for all functions pages */
     protected $bookName = "";
 
@@ -253,10 +251,9 @@ protected function resolveLinks($name) {
         }
     }
 
-    public function format_type_text($type, $tagname) {
+    public function format_type_text($type) {
         $type = trim(preg_replace('/[ \n\t]+/', ' ', $type));
         $t = strtolower($type);
-        $href = $fragment = "";
 
         switch($t) {
         case "bool":
@@ -284,7 +281,6 @@ public function format_type_text($type, $tagname) {
             break;
         case "mixed":
             $href = "language.types.declarations";
-            $fragment = "language.types.declarations.$t";
             break;
         default:
             /* Check if its a classname. */
@@ -304,15 +300,15 @@ public function format_type_text($type, $tagname) {
         return '';
     }
 
-    public function format_type_if_object_or_pseudo_text($type, $tagname) {
+    public function format_type_if_object_or_pseudo_text($type) {
         if (in_array(strtolower($type), array("bool", "int", "double", "boolean", "integer", "float", "string", "array", "object", "resource", "null"))) {
             parent::getPdfDoc()->appendText(" " . $type);
             return false;
         }
-        return self::format_type_text($type, $tagname);
+        return self::format_type_text($type);
     }
 
-    public function format_collect_id($open, $name, $attrs, $props, $newpage = false) {
+    public function format_collect_id($open, $name, $attrs) {
         if ($open && isset($attrs[Reader::XMLNS_XML]["id"]) && $id = $attrs[Reader::XMLNS_XML]["id"]) {
                 $this->setIdToPage($id);
         }
diff --git a/phpdotnet/phd/Package/PHP/XHTML.php b/phpdotnet/phd/Package/PHP/XHTML.php
index 16fc41b9..e4ed09ac 100644
--- a/phpdotnet/phd/Package/PHP/XHTML.php
+++ b/phpdotnet/phd/Package/PHP/XHTML.php
@@ -664,7 +664,7 @@ public function format_type_methodparam_text($type, $tagname) {
 
     public function format_type_text($type, $tagname) {
         $t = strtr(strtolower($type), ["_" => "-", "\\" => "-"]);
-        $href = $fragment = "";
+        $fragment = "";
 
         switch($t) {
         case "void":
diff --git a/phpdotnet/phd/Render.php b/phpdotnet/phd/Render.php
index fc0d829b..d58d50e2 100644
--- a/phpdotnet/phd/Render.php
+++ b/phpdotnet/phd/Render.php
@@ -48,7 +48,7 @@ public function execute(Reader $r) { /* {{{ */
         $lastdepth = -1;
         while($r->read()) {
             $type = $r->nodeType;
-            $data = $retval = $name = $open = false;
+            $open = false;
 
             switch($type) {
                 case \XMLReader::ELEMENT: /* {{{ */
diff --git a/phpdotnet/phd/functions.php b/phpdotnet/phd/functions.php
index ba566e8f..963d25e7 100644
--- a/phpdotnet/phd/functions.php
+++ b/phpdotnet/phd/functions.php
@@ -56,7 +56,7 @@ function term_color($text, $color)
 /* }}} */
 
 /* {{{ The PhD errorhandler */
-function errh($errno, $msg, $file, $line, $ctx = null) {
+function errh($errno, $msg, $file, $line) {
     static $err = array(
         // PHP Triggered Errors
         E_DEPRECATED                  => 'E_DEPRECATED          ',