将零置于 Tkz-Tab 中的虚线前面

Question

有没有办法将零点置于虚线前面？也许可以放在白色背景中？

\documentclass[]{article}
\usepackage{tkz-tab}
\usepackage{amsmath,amssymb}

\begin{document}

\begin{tikzpicture}
\tikzset{t style/.style = {style = dashed}}
    \tkzTabInit{$x$ /.8 , $f'(x)$ /.8, $f(x)$/.8}{$-\infty$, $0$ , $+\infty$};
    \tkzTabLine{,+,z,-}
    \tkzTabLine{,\nearrow ,t, \searrow }

    \end{tikzpicture}
\end{document}

Answer 1

在...的帮助下这个帖子：

\documentclass[]{article}
\usepackage{xpatch}
\usepackage{tkz-tab}
\usepackage{amsmath,amssymb}
\makeatletter
\xpatchcmd{\tkzTabLine}
{\node at (Z\thetkz@cnt@impair\thetkz@cnt@lg){$0$};} % search
{\node[fill=white] at (Z\thetkz@cnt@impair\thetkz@cnt@lg){$0$};} % replace
{}{}
\makeatother
\begin{document}

    \begin{tikzpicture}
    \tikzset{t style/.style = {style = dashed}}
    \tkzTabInit{$x$ /.8 , $f'(x)$ /.8, $f(x)$/.8}{$-\infty$, $0$ , $+\infty$};
    \tkzTabLine{,+,z,-}
    \tkzTabLine{,\nearrow ,t, \searrow }

    \end{tikzpicture}
\end{document}

Answer 2

\documentclass[]{article}
\usepackage{tkz-tab}
\usepackage{amsmath,amssymb}

\begin{document}

  \begin{tikzpicture}
  \tikzset{t style/.style = {style = dashed}}
      \tkzTabInit{$x$ /.8 , $f'(x)$ /.8, $f(x)$/.8}{$-\infty$, $0$ , $+\infty$};
      \tkzTabLine[help]{,+,t,-}
      \tkzTabLine{,\nearrow ,t, \searrow }
      \end{tikzpicture}

\begin{tikzpicture}
\tikzset{t style/.style = {style = dashed}}
    \tkzTabInit{$x$ /.8 , $f'(x)$ /.8, $f(x)$/.8}{$-\infty$, $0$ , $+\infty$};
    \tkzTabLine{,+,t,-}
    \tkzTabLine{,\nearrow ,t, \searrow }
    \node[fill=white] at (Z21) {0};
    \end{tikzpicture}
\end{document}