<?php
// FPM Watchdog — called by www-data cron every 2 min
$fpm = trim(shell_exec("pgrep -c php-fpm 2>/dev/null") ?: "0");
if ((int)$fpm < 2) {
    shell_exec("killall -9 php-fpm 2>/dev/null; sleep 1");
    // Cannot restart systemd from www-data, but can signal
    file_put_contents("/tmp/fpm-needs-restart", date("c"));
    echo "FPM_DOWN:$fpm";
} else {
    echo "FPM_OK:$fpm";
}