PHP command to switch PHP versions using Homebrew

phpver

#!/usr/bin/php
<?php

if (!isset($argv[1])) {
    echo_error("Please, tell me what PHP version you want!");
    exit;
}

$to_version = $argv[1];
$to_version = (int)str_replace('.', '', $to_version);

@exec('php -v', $output);

if (!isset($output[0])) {
    echo_error("It seems you don't have PHP installed");
    exit;
}

preg_match('/PHP (\d+\.\d+)/', $output[0], $matches);
$from_version = str_replace('.', '', $matches[1]);

check_php_install($to_version, $from_version);

stop_php_services();
start_php($to_version);

echo_success("Done!");
system("php -v");

function echo_error($string) {
    echo "\033[31m$string\033[0m\n";
}

function echo_info($string) {
    echo "\033[36m$string\033[0m\n";
}

function echo_warning($string) {
    echo "\033[33m$string\033[1m\n";
}

function echo_success($string) {
    echo "\033[32m$string\033[0m\n";
}

function check_php_install($to_version, $from_version) {
    @exec("brew list | grep php$to_version", $output);
    if (count($output) === 0) {
        echo_warning("Package php$to_version not found.");
        stop_php_services();
        echo_info("Installing php$to_version...");
        @exec("brew install php$to_version");
    }
}

function stop_php_services() {
    @exec("brew services list | grep php", $output);
    $pattern = "/^php(\d+)\s+([a-z]+)/";
    foreach ($output as $line) {
        preg_match($pattern, $line, $matches);
        if (isset($matches[2])) {
            if ($matches[2] === 'started') {
                stop_php($matches[1]);
            }
        }
    }
}

function start_php($version) {
    echo_info("Starting php$version...");
    @exec("brew services start php$version"); // TODO check if it's not started yet
    @exec("brew link php$version"); // TODO check if it's not linked yet
}

function stop_php($version) {
    echo_info("Stopping php$version...");
    @exec("brew unlink php$version"); // TODO check if it's linked first
    @exec("brew services stop php$version"); // TODO  check if it's started
}

How to use

1. Copy this file to ~/phpver for example
2. Add an alias to your ~/.bash_profile or something similar:

alias phpver='php ~/phpver'

3. Reload your bash file

source ~/.bash_profile

4. Run the command to switch to PHP 5.6, for example. If it's not installed it'll be:

phpver 5.6