atención este hook solo funcionaría correctamente bajo ciertas condiciones leerlas en readme

00 readme pre-post

Condiciones que se debe cumplir

1> deben estar declarados mis alias (mirar otros gist) 
2> debe usarse composer 
3> debe estar instalado al menos el composer.json que proporciono 
4> debe estar instalado phpstan . 

Incluso tras cumplir todos estos requisitos podría contener errores en los pasos finales mostrando error:
error: fallo el push de algunas referencias a 'git@gitlab.com:usuario/repo.git'

composer.json

{
    "require-dev": {
        "phpstan/phpstan": "^0.10.6"
    },
	"scripts": {
        "phpstan": "phpstan analyse src/ -c phpstan.neon --level=4 --no-progress -vvv"
    }
}

pre-push

#!/bin/sh
#
# An example hook script to verify what is about to be committed.
# Called by "git commit" with no arguments.  The hook should
# exit with non-zero status after issuing an appropriate message if
# it wants to stop the commit.
#
# To enable this hook, rename this file to "pre-commit".

exec < /dev/tty

read -p 'Run PhpCs? [y/n](n):' proceed

if [ "$proceed" = 'y' ]; then
  phpfiles=$(git lgfile | grep \.php)
  echo "files: $phpfiles"
  if [ "$phpfiles" != "" ]; then
    test=$(phpcs -q --report=diff $phpfiles)

    if [ "$test" = "" ]; then
      echo 'passed'
    else
      echo 'NO passed'
      echo "$test"
      exit 1;
    fi
  fi
fi

read -p 'Run PhpStan? [y/n](n):' proceed

if [ "$proceed" = 'y' ]; then
  phpfiles=$(git lgfile | grep \.php)

  if [ "$phpfiles" != "" ]; then
    test=$(composer phpstan)

    if [ "$test" = "" ]; then
      echo 'passed'
    else
      echo "$test"
      exit 1;
    fi
  fi
fi


# If you want to allow non-ASCII filenames set this variable to true.
allownonascii=$(git config --bool hooks.allownonascii)

# Redirect output to stderr.
exec 1>&2

# Cross platform projects tend to avoid non-ASCII filenames; prevent
# them from being added to the repository. We exploit the fact that the
# printable range starts at the space character and ends with tilde.
if [ "$allownonascii" != "true" ] &&
	# Note that the use of brackets around a tr range is ok here, (it's
	# even required, for portability to Solaris 10's /usr/bin/tr), since
	# the square bracket bytes happen to fall in the designated range.
	test $(git diff --cached --name-only --diff-filter=A -z $against |
	  LC_ALL=C tr -d '[ -~]\0' | wc -c) != 0
then
	cat <<\EOF
Error: Attempt to add a non-ASCII file name.

This can cause problems if you want to work with people on other platforms.

To be portable it is advisable to rename the file.

If you know what you are doing you can disable this check using:

  git config hooks.allownonascii true
EOF
	exit 1
fi

# If there are whitespace errors, print the offending file names and fail.
#exec git diff-index --check --cached $against --