# Change bibliography numbering style with BibLaTeX

Is there a way to change the appearance of the reference number using BibLatex with a specific style?

I am using the phys style and would like to have the reference numbers appear in square brackets rather than as superscripts. Here is a MWE of what I have at the moment

\documentclass{article}
\usepackage[giveninits=true,isbn=false,url=false,doi=false,hyperref=true,backend=biber, style=phys]{biblatex}

\begin{document}
Test \cite{PhysRevLett.128.051103}
\printbibliography
\end{document}


with sample.bib containing

@article{PhysRevLett.128.051103,
title = {Bondi-Metzner-Sachs Group in Five Spacetime Dimensions},
author = {Fuentealba, Oscar and Henneaux, Marc and Matulich, Javier and Troessaert, C\'edric},
journal = {Phys. Rev. Lett.},
volume = {128},
issue = {5},
pages = {051103},
numpages = {5},
year = {2022},
month = {Feb},
publisher = {American Physical Society},
doi = {10.1103/PhysRevLett.128.051103},
}


This produces the output:

which, apart from the superscript reference number, is the style I wish to achieve including the hyperlink on the journal, issue, pages and year.

biblatex-phys has an option called biblabel with which you can switch between superscript numbers (the default biblabel=superscript,) or bracketed numbers (biblabel=brackets,) in the bibliography.

\documentclass{article}

\usepackage[
backend=biber,
style=phys,
giveninits=true,
isbn=false,url=false,doi=false,
biblabel=brackets,
]{biblatex}