php switching for taskfile

taskfile.sh

unlink_php() {
    PHP_CURRENT=$(php -v | head -n 1 | cut -d " " -f 2 | cut -f1-2 -d".");
    PHP_LATEST=$(ls /usr/local/Cellar/php | cut -f1-2 -d".");

    echo "Your current PHP version is ${PHP_CURRENT}";
    echo "The latest version of PHP installed is ${PHP_LATEST}";
    echo "Unlinking PHP ${PHP_CURRENT}...";

    if [ ${PHP_CURRENT} = ${PHP_LATEST} ]; then
        brew unlink php
    else
        brew unlink php@${PHP_CURRENT}
    fi
}

php7() {
    unlink_php
    echo "Linking php 7.4..."
    brew link php@7.4
}

php8() {
    unlink_php
    echo "Linking php 8"
    brew link php@8.0
}

php81() {
    unlink_php
    echo "Linking php 8.1"
    brew link php
}