Change php version by directory for mac (HomeBrew).

php_ver_by_dir_for_mac.md

Prerequisites

• HomeBrew
• direnv

Install php

install php versions you want from homebrew

brew install php@7.2 php@7.4 php@8.1

Setup direnv

Setup "use_php" function

script will write to "${XDG_CONFIG_HOME:-$HOME}/.config/direnv/lib/use_php.sh" for instance usually at "~/.config/direnv/lib/use_php.sh" please check it first, this CAN NOT BE UNDONE

following command for checking if the install path is empty

echo "${XDG_CONFIG_HOME:-$HOME}/.config/direnv/lib/use_php.sh"

Setup, just paste it to terminal

LIB_DIR="${XDG_CONFIG_HOME:-$HOME}/.config/direnv/lib"
INSTALL_PATH="${LIB_DIR}/use_php.sh"
mkdir -p "$LIB_DIR"
echo '# load homebrew php' >"${LIB_DIR}/use_php.sh"
echo 'use_php(){' >>"${LIB_DIR}/use_php.sh"
echo '	local php_version="$1"' >>"${LIB_DIR}/use_php.sh"
echo '	local php_prefix="$(brew --prefix php@${php_version})"' >>"${LIB_DIR}/use_php.sh"
echo '	PATH_add "$php_prefix/bin" "$php_prefix/sbin"' >>"${LIB_DIR}/use_php.sh"
echo '}' >>"${LIB_DIR}/use_php.sh"
echo '' >>"${LIB_DIR}/use_php.sh"
echo "use_php function installed to $INSTALL_PATH"

after setup, things will looks like

$ cat "${XDG_CONFIG_HOME:-$HOME}/.config/direnv/lib/use_php.sh"
# load homebrew php
use_php(){
	local php_version="$1"
	local php_prefix="$(brew --prefix php@${php_version})"
	PATH_add "$php_prefix/bin" "$php_prefix/sbin"
}

Usage

# add use_php to .envrc of your project
cd path/to/project/root
echo "use_php 8.1" >> .envrc && direnv allow

# check php version
php --version