Keyboard shortcuts to raise specific windows

#!/usr/bin/env php
<?php
array_shift($argv); //script name
$search = array_shift($argv);

function has_arg(string $arg): bool {
        return (in_array("--$arg", $GLOBALS['argv']) || preg_match("/(?<!-)-[a-z]*$arg[0]/", join(' ', $GLOBALS['argv'])));
}
function debug(string $msg): void {
    if (DEBUG) {
        echo "[DEBUG] $msg\n";
    }
}
define('DEBUG', has_arg('debug'));

if (!$search || $search[0] == '-' || has_arg('help')) {
    echo <<<HELP
    Usage: siwm <search> [executable] [-hdc]
    Args:
        search    : what you're searching for (window title, or class together with --class)
        executable: what to run if nothing is found - if this is not given, it tries to execute the search string
    Options:
        -h/--help : show this and quit 🙃
        -d/--debug: show extra debug info
        -c/--class: search by window classes instead of titles

    HELP;
    echo "\n";
    exit;
}

if (has_arg('class')) {
    $wmctrlSearch = 'wmctrl -x';
    debug("Searching by class: $search");
} else {
    $wmctrlSearch = 'wmctrl';
    debug("Searching through window titles: $search");
}

$search = preg_replace('/([\[\]])/', '\\\$1', $search);
$searchCmd = "$wmctrlSearch -l | grep -iw -m1 \"$search\"";
debug("$> $searchCmd");
$isOpen = shell_exec($searchCmd);

if ($isOpen) {
    $wmctrl = 'wmctrl -i'; //selects the window by its ID, which is more reliable
    debug('Window found: "'.trim($isOpen).'"');
    [$id] = explode(' ', $isOpen);
    echo "Raising window $id...\n";
    if (str_contains(shell_exec("xprop -id \$id"), 'STICKY')) {
        echo "[DEBUG] Hmmmm, it's sticky! Let's do it differently.\n";
        shell_exec("$wmctrl -R $id; $wmctrl -r $id -b add,sticky");
    } else {
        shell_exec("$wmctrl -a $id");
    }
} else {
    echo "No window found matching '$search' 🤨 \n";
    $app = join(' ', array_filter($argv, static fn($arg)=> !str_starts_with($arg, '-')));
    if (!$app && !str_contains(' ', $search) && shell_exec("which $search")) {
        $app = $search;
    }

    if (!$app) {
        echo "Also, nothing to execute related to that. Try [...]\n";
        exit;
    }

    //https://stackoverflow.com/a/11921855/102960
    echo "Running `$app`...\n";
    if (pcntl_fork() == 0) {
        shell_exec($app);
    }
}