[OSX][BREW] Handle multiple PHP versions gracefully while 'brew upgrade'

brew-update.php

#!/usr/bin/php
<?php
$packageArray = [];

// Save actual php version for restore at the end
$prevPHPVersion = exec('php -r' . escapeshellarg('echo PHP_VERSION;'));
list($major, $minor, $patch) = explode('.', $prevPHPVersion);
$prevPHPVersion = "$major$minor";

// Update brew repository
passthru('brew update');

// Get all php packages
exec('brew ls | grep -e ' . escapeshellarg('php\d\d'), $packageArray);

// Get all PHP Versions for unlink
$phpVersions = [];
foreach ($packageArray as $package) {
    if (strpos($package, '-') === false) {
        $phpVersions[] = $package;
    }
}

// Get all PHP packages which need an update
$updatePackages = [];
foreach ($packageArray as $package) {
    $info = current(json_decode(exec('brew info --json=v1 ' . escapeshellarg($package)), true));
    if ($info['outdated']) {
        list($version) = explode('-', $package, 2);
        $updatePackages[$version][] = $package;
    }
}

if ($updatePackages) {
    echo 'Found PHP packages to update ' . implode(
            ', ',
            iterator_to_array(new RecursiveIteratorIterator(new RecursiveArrayIterator($updatePackages)))
        ) . PHP_EOL;
    // Upgrade all Versions seperate
    foreach ($updatePackages as $version => $versionPackages) {
        // Unlink all installed version
        exec('brew unlink ' . implode(' ', $phpVersions));

        // Link the one we want to update
        exec('brew link ' . $version);

        echo 'Updating' . implode(' ', $versionPackages) . PHP_EOL;

        // Upgrade the version and it's packages
        passthru('brew upgrade ' . implode(' ', $versionPackages));
    }

    // Restore PHP Version
    echo 'Restore original php' . $prevPHPVersion . PHP_EOL;
    exec('brew unlink ' . implode(' ', $phpVersions));
    exec('brew link php' . $prevPHPVersion);
}

// Upgrade the rest
passthru('brew upgrade');

// Cleanup
passthru('brew cleanup');