Fix deprecation warnings in PHP 8.4 caused by implicitly nullable parameters

Author: xemlock

library/PhpLatex/Node.php

@@ -15,14 +15,14 @@ class PhpLatex_Node
      * @param mixed $type
      * @param array $props
      */
-    public function __construct($type, array $props = null)
+    public function __construct($type, array $props = array())
     {
         $this->_type = $type;
 
         // _props and _children properties are lazily-initialized
         // on first write
 
-        if (null !== $props) {
+        if ($props) {
             $this->setProps($props);
         }
     }
@@ -98,7 +98,7 @@ public function setProps(array $props)
      */
     public function getProps()
     {
-        return (array) $this->_props;
+        return $this->_props;
     }
 
     /**

library/PhpLatex/PdfLatex.php

@@ -126,14 +126,14 @@ public function getBuildDir()
         return $this->_buildDir;
     }
 
-    public function compile($file, array $files = null)
+    public function compile($file, array $files = array())
     {
         $this->_log = null;
 
         $cwd = getcwd();
         $dir = dirname($file);
 
-        foreach ((array) $files as $path) {
+        foreach ($files as $path) {
             // TODO handle Windows
             if (!is_file($dir . '/' . basename($path))) {
                 if (!@symlink($path, $dir . '/' . basename($path))) {
@@ -183,7 +183,7 @@ public function compile($file, array $files = null)
      * @return string Path to compiled PDF document
      * @throws Exception
      */
-    public function compileString($script, array $files = null)
+    public function compileString($script, array $files = array())
     {
         $buildDir = $this->getBuildDir() . 'pdflatex/' . md5($script);
         $output = $buildDir . '/output.pdf';

library/PhpLatex/Renderer/Html.php

@@ -622,7 +622,7 @@ protected function _renderStyled(PhpLatex_Node $node)
         return (string) $render;
     }
 
-    protected function _wrapStyle($render, array $diff = null)
+    protected function _wrapStyle($render, array $diff = array())
     {
         $tags = array();
         $style = array();