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doc/config/boxes.tex

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+\tcbset{
+    warningstyle/.style={
+        colback=yellow!10!white,
+        colframe=red!50!black,
+        fonttitle=\bfseries,
+    }
+}
+
+\newtcolorbox{warnbox}[1][]{
+    warningstyle,
+    title=\faWarning{} Warning,
+    #1
+}

doc/config/commands.tex

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+% Print WordPress name.
+\NewDocumentCommand{\WP}{ s }{%
+    \IfBooleanTF{#1}{\textsc{wp}\xspace}{WordPress\xspace}%
+}
+
+% Print ACF name.
+\NewDocumentCommand{\acf}{ s }{%
+    \IfBooleanTF{#1}{\textsc{acf}\xspace}{Advanced Custom Fields\xspace}%
+}
+
+% Print RHPZ name.
+\NewDocumentCommand{\rhpz}{ s }{%
+    \IfBooleanTF{#1}{\textsc{RHPZ}\xspace}{Romhack Plaza\xspace}%
+}
+
+% Show directory structure.
+\NewDocumentCommand{\dir}{ s m }{%
+    \textcolor{violet}{\textsl{#2\IfBooleanF{#1}{.php}}}\xspace%
+}
+
+\NewDocumentCommand{\sourceargs}{ m }{
+    \textbf{Parameters}: \begin{itemize}%
+         #1%
+    \end{itemize}%
+}
+\NewDocumentCommand{\sourcereturn}{ m }{
+    \textbf{Return}: \begin{itemize}%
+                             #1%
+    \end{itemize}%
+}
+\NewDocumentCommand{\sourceexample}{ m m m }{
+    \textbf{Example}: %
+    \lstinputlisting[firstnumber=1,linerange={#2-#3}]{#1}%
+}

doc/config/listings.tex

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+\lstset{
+    language=PHP,
+    alsoletter={\$},
+    basicstyle=\ttfamily,
+    numbers=left,
+    frame=single,
+    breaklines=true,
+    breakatwhitespace=true,
+    columns=flexible,
+    keywordstyle=\color{blue},
+    keywordstyle=[2]\color{teal}, % Var & Useful functions.
+    keywordstyle=[3]\color{purple},
+    commentstyle=\color{lightgray}\itshape,
+    stringstyle=\color{orange},
+    numberstyle=\color{lightgray},
+    showstringspaces=false,
+    morekeywords={
+        require_once,
+        public,
+        protected,
+        private,
+        final,
+        static,
+        function,
+        return,
+        function,
+        namespace,
+        global,
+        defined,
+        class,
+        abstract,
+        interface,
+        new,
+        string,
+        int,
+    }, % PHP Keywords.
+    morekeywords=[2]{
+        \$_romhackplaza,
+        \$_romhackplaza_theme,
+        \$post_id,
+        \$this,
+        \$post_types,
+        \$context,
+    }, % Plugin useful vars.
+    morekeywords=[3]{
+        do_action,
+        add_action,
+        add_filter,
+        apply_filters,
+        CPT
+    } % Plugin & WP useful functions.
+}