Switch PHP version on Mac using Brew

steps.md

1. Check if grep is installed

grep --version

If it returns below

grep (BSD grep, GNU compatible) 2.6.0-FreeBSD

2. Then install it using brew

brew install grep

3. Add below shell script to ~/.zshrc

# determine versions of PHP installed with HomeBrew
installedPhpVersions=($(brew ls --versions | ggrep -E 'php(@.*)?\s' | ggrep -oP '(?<=\s)\d\.\d' | uniq | sort))

# create alias for every version of PHP installed with HomeBrew
for phpVersion in ${installedPhpVersions[*]}; do
    value="{"

    for otherPhpVersion in ${installedPhpVersions[*]}; do
        if [ "${otherPhpVersion}" = "${phpVersion}" ]; then
            continue;
        fi

        value="${value} brew unlink php@${otherPhpVersion};"
    done

    value="${value} brew link php@${phpVersion} --force --overwrite; } &> /dev/null && php -v"

    alias "${phpVersion}"="${value}"
done

4. Re-compile ~/.zshrc file

source ~/.zshrc

5. Run commands like this to switch to specific version

e.g. 8.2

should return as below

PHP 8.2.1 (cli) (built: Jan 12 2023 03:48:24) (NTS)
Copyright (c) The PHP Group
Zend Engine v4.2.1, Copyright (c) Zend Technologies
    with Zend OPcache v8.2.1, Copyright (c), by Zend Technologies