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Editing:functions.php

<?php
/**
 * ARCHI-TECH Global Helper Functions
 */

require_once __DIR__ . '/db.php';

/**
 * Fetch a setting from the settings table with static caching
 */
function get_setting($key, $default = '') {
    global $pdo;
    static $settings_cache = null;
    
    if ($settings_cache === null) {
        $settings_cache = [];
        try {
            $stmt = $pdo->query("SELECT setting_key, setting_value FROM settings");
            while ($row = $stmt->fetch()) {
                $settings_cache[$row['setting_key']] = $row['setting_value'];
            }
        } catch (Exception $e) {
            // Silent fallback in case DB schema is not loaded yet
            return $default;
        }
    }
    
    return isset($settings_cache[$key]) ? $settings_cache[$key] : $default;
}

/**
 * Sanitize user input to protect against XSS
 */
function sanitize_input($data) {
    if (is_array($data)) {
        return array_map('sanitize_input', $data);
    }
    return htmlspecialchars(trim($data), ENT_QUOTES, 'UTF-8');
}

/**
 * Check if the active script matches the link to apply high-luxury navigation highlights
 */
function is_active_nav($page_name) {
    $current_script = basename($_SERVER['SCRIPT_NAME']);
    return ($current_script === $page_name) ? 'active' : '';
}

/**
 * Format date for high-end portfolio grids
 */
function format_project_date($date_str) {
    if (empty($date_str)) return 'In Progress';
    $date = date_create($date_str);
    return date_format($date, 'F Y');
}

/**
 * Authenticate Admin Session
 */
function is_admin_logged_in() {
    return isset($_SESSION['admin_logged_in']) && $_SESSION['admin_logged_in'] === true;
}

/**
 * Restrict page access for logged-in administrators
 */
function check_admin_auth() {
    if (!is_admin_logged_in()) {
        header("Location: " . BASE_URL . "admin/login.php");
        exit();
    }
}

/**
 * Clean URL slug generation helper
 */
function slugify($text) {
    $text = preg_replace('~[^\pL\d]+~u', '-', $text);
    $text = iconv('utf-8', 'us-ascii//TRANSLIT', $text);
    $text = preg_replace('~[^-\w]+~', '', $text);
    $text = trim($text, '-');
    $text = preg_replace('~-+~', '-', $text);
    $text = strtolower($text);
    if (empty($text)) {
        return 'n-a';
    }
    return $text;
}

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Editing:functions.php