wp-healthcheck/includes/steps/20-environment.php

<?php
if (!defined('ABSPATH')) exit;

return new class extends WPH_Step {
    public function id(): string { return 'environment'; }
    public function title(): string { return 'Step 2 — Environment Check'; }
    public function blurb(): string {
        return 'Before touching updates, review the hosting environment.';
    }
    public function sub_items(): array {
        return [
            'PHP version — check against WordPress requirements and plugin compatibility. Flag if below 8.1. Note if EOL.',
            'Disk usage — flag if over 80% used',
            'Error logs — check the server error log and WordPress debug log if enabled. Note any recurring errors, 500s, or deprecated function warnings',
            'wp-config.php — confirm WP_DEBUG is off on production',
            'File permissions — spot check wp-config.php (should be 640 or 600), wp-content (755), uploads (755)',
        ];
    }

    public function autocheck(array $session_state): array {
        $f = [];

        // PHP version + EOL
        // EOL dates from php.net (Y-m-d). Conservative — bump as new versions ship.
        $eol = [
            '7.4' => '2022-11-28',
            '8.0' => '2023-11-26',
            '8.1' => '2025-12-31',
            '8.2' => '2026-12-31',
            '8.3' => '2027-12-31',
            '8.4' => '2028-12-31',
        ];
        $php = PHP_MAJOR_VERSION . '.' . PHP_MINOR_VERSION;
        if (isset($eol[$php])) {
            $is_eol = strtotime($eol[$php]) < time();
            $f[] = $this->finding(
                'php_version',
                $is_eol ? 'bad' : (version_compare($php, '8.1', '<') ? 'warn' : 'ok'),
                'PHP version',
                PHP_VERSION,
                $is_eol ? "EOL since {$eol[$php]} — upgrade urgently." : "Supported until {$eol[$php]}."
            );
        } else {
            $f[] = $this->finding('php_version', 'info', 'PHP version', PHP_VERSION, 'EOL date unknown for this branch.');
        }

        // WP version vs latest
        global $wp_version;
        if (!function_exists('get_core_updates')) require_once ABSPATH . 'wp-admin/includes/update.php';
        $updates = function_exists('get_core_updates') ? get_core_updates(['dismissed' => true]) : [];
        $latest = (!empty($updates) && !empty($updates[0]->current)) ? $updates[0]->current : $wp_version;
        $behind = version_compare($wp_version, $latest, '<');
        $f[] = $this->finding(
            'wp_version',
            $behind ? 'warn' : 'ok',
            'WordPress version',
            $wp_version,
            $behind ? "Latest is {$latest} — update available." : 'Up to date.'
        );

        // Disk usage on ABSPATH
        $free = @disk_free_space(ABSPATH);
        $total = @disk_total_space(ABSPATH);
        if ($free !== false && $total !== false && $total > 0) {
            $used_pct = round(($total - $free) / $total * 100, 1);
            $level = $used_pct > 90 ? 'bad' : ($used_pct > 80 ? 'warn' : 'ok');
            $f[] = $this->finding(
                'disk_usage',
                $level,
                'Disk usage',
                $used_pct . '% used',
                size_format($total - $free) . ' of ' . size_format($total) . ' (free: ' . size_format($free) . ')'
            );
        }

        // wp-config flags
        $flags = [
            'WP_DEBUG'           => false,
            'WP_DEBUG_DISPLAY'   => true,    // default true; we want false on production
            'WP_DEBUG_LOG'       => false,
            'DISALLOW_FILE_EDIT' => false,   // we want this true
            'WP_ENVIRONMENT_TYPE'=> 'production',
        ];
        foreach ($flags as $const => $expected_for_prod) {
            if (!defined($const)) {
                if ($const === 'WP_ENVIRONMENT_TYPE') continue; // optional
                $f[] = $this->finding('flag_' . strtolower($const), 'info', $const, 'not defined', 'Default applies.');
                continue;
            }
            $val = constant($const);
            if ($const === 'WP_ENVIRONMENT_TYPE') {
                $f[] = $this->finding('flag_env_type', 'info', 'WP_ENVIRONMENT_TYPE', (string) $val, '');
                continue;
            }
            $bool = (bool) $val;
            $ok = ($const === 'DISALLOW_FILE_EDIT') ? ($bool === true) : ($bool === false);
            $level = $ok ? 'ok' : ($const === 'WP_DEBUG_DISPLAY' ? 'bad' : 'warn');
            $f[] = $this->finding(
                'flag_' . strtolower($const),
                $level,
                $const,
                $bool ? 'true' : 'false',
                $ok ? '' : ($const === 'WP_DEBUG_DISPLAY' ? 'Errors are being shown to visitors — turn this off on production.' : 'Recommended: ' . ($expected_for_prod ? 'true' : 'false') . ' on production.')
            );
        }

        // Permissions on key paths
        foreach ([
            'wp-config.php' => ABSPATH . 'wp-config.php',
            'wp-content/'   => WP_CONTENT_DIR,
            'uploads/'      => wp_get_upload_dir()['basedir'] ?? WP_CONTENT_DIR . '/uploads',
        ] as $label => $path) {
            if (!file_exists($path)) continue;
            $perms = substr(sprintf('%o', fileperms($path)), -4);
            // wp-config: 600 or 640; dirs: 755 (loose check)
            $is_cfg = $label === 'wp-config.php';
            $ok = $is_cfg ? in_array($perms, ['0600', '0640'], true)
                          : in_array($perms, ['0755', '0750'], true);
            $f[] = $this->finding(
                'perm_' . sanitize_key($label),
                $ok ? 'ok' : 'warn',
                'Permissions: ' . $label,
                $perms,
                $ok ? '' : ($is_cfg ? 'Recommend 600 or 640.' : 'Recommend 755 or 750.')
            );
        }

        // Error log size (PHP error_log + WP debug.log)
        foreach ([
            'PHP error_log' => ini_get('error_log'),
            'WP debug.log'  => WP_CONTENT_DIR . '/debug.log',
        ] as $label => $path) {
            if (!$path || !file_exists($path) || !is_readable($path)) continue;
            $size = filesize($path);
            $level = $size > 10 * MB_IN_BYTES ? 'warn' : 'info';
            $f[] = $this->finding(
                'log_' . sanitize_key($label),
                $level,
                $label,
                size_format($size),
                $path . ($level === 'warn' ? ' — large file, consider rotating + reviewing tail.' : '')
            );
        }

        return $f;
    }
};