Delete local branches not on remote

delete-old-branches.php

#!/usr/bin/php
<?php

define('REMOTE_NAME', 'jeff');

$branchesToKeep = array(
    'cas', 'integration-sdk', 'saml-testing', 'new-authentication'
);

$branchCommands = array(
    'local'  => 'git branch',
    'remote' => "git ls-remote --heads " . REMOTE_NAME . " | sed 's?.*refs/heads/??'"
);

$localBranches  = array();
$remoteBranches = array();
foreach ($branchCommands as $location => $command) {
    $branches = explode(PHP_EOL, shell_exec($command));
    foreach ($branches as $branch) {
        $branch = trim(str_replace('*', '', $branch));
        if (empty($branch)) {
            continue;
        }

        if ($location === 'local') {
            $localBranches[]  = $branch;
        } else {
            $remoteBranches[] = $branch;
        }
    }
}

foreach ($localBranches as $k => $branch) {
    if (!in_array($branch, $remoteBranches)
        && !in_array($branch, $branchesToKeep)) {

        print shell_exec('git branch -D ' . $branch);
    }
}