How to break header titles in a table

Question

Please, how to break headers titles in a table ?

\begin{table}[H]
\begin{tabular}[h]{|p{2cm}||p{2cm}} 
\hline
{title one} & {title two}   \\ \hline\hline
\end{tabular}
\caption{title}
\end{table}

Thank you.

Answer 1

You can use \parboxes with line changing commands; inside the boxes you can use \centering to center the contents:

\documentclass{article}

\begin{document}

\begin{table}
\centering
\begin{tabular}{|p{2cm}|p{2cm}|} 
\hline
\parbox[t]{2cm}{\centering title \\ one} & \parbox[t]{2cm}{\centering title \\ two} \\[3ex]
some text & some text \\
some text & some text \\
\hline
\end{tabular}
\caption{title}
\end{table}

\end{document}

I used the vertical rules as visual reference points. On a side note, with such narrow columns, you could consider setting them ragged right.