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Editing:functions.php

<?php

// Function to safely redirect
function redirect($path) {
    header("Location: " . BASE_URL . $path);
    exit;
}

// Function to handle image upload
function uploadImage($file, $targetDir = "uploads/logos/") {
    $targetDir = __DIR__ . "/../" . $targetDir;
    if (!is_dir($targetDir)) {
        mkdir($targetDir, 0777, true);
    }

$fileName = time() . '_' . basename($file["name"]);
    $targetFilePath = $targetDir . $fileName;
    $fileType = pathinfo($targetFilePath, PATHINFO_EXTENSION);

// Allow certain file formats
    $allowTypes = array('jpg', 'png', 'jpeg', 'gif');
    if (in_array(strtolower($fileType), $allowTypes)) {
        // Upload file to server
        if (move_uploaded_file($file["tmp_name"], $targetFilePath)) {
            return $fileName;
        }
    }
    return false;
}

// Function to handle document upload (CVs)
function uploadFile($file, $targetDir = "uploads/cvs/") {
    $targetDir = __DIR__ . "/../" . $targetDir;
    if (!is_dir($targetDir)) {
        mkdir($targetDir, 0777, true);
    }

$fileName = time() . '_' . basename($file["name"]);
    $targetFilePath = $targetDir . $fileName;
    $fileType = pathinfo($targetFilePath, PATHINFO_EXTENSION);

// Allow certain file formats
    $allowTypes = array('pdf', 'doc', 'docx');
    if (in_array(strtolower($fileType), $allowTypes)) {
        // Upload file to server
        if (move_uploaded_file($file["tmp_name"], $targetFilePath)) {
            return $fileName;
        }
    }
    return false;
}

// Function to check if user is logged in
function isLoggedIn() {
    return isset($_SESSION['employer_id']) || isset($_SESSION['admin_id']) || isset($_SESSION['candidate_id']);
}

// Function to get time ago
function timeAgo($timestamp) {
    $time_ago = strtotime($timestamp);
    $cur_time = time();
    $time_elapsed = $cur_time - $time_ago;
    $seconds = $time_elapsed;
    $minutes = round($time_elapsed / 60);
    $hours = round($time_elapsed / 3600);
    $days = round($time_elapsed / 86400);
    $weeks = round($time_elapsed / 604800);
    $months = round($time_elapsed / 2600640);
    $years = round($time_elapsed / 31207680);

if ($seconds <= 60) return "just now";
    else if ($minutes <= 60) return ($minutes == 1) ? "1 minute ago" : "$minutes minutes ago";
    else if ($hours <= 24) return ($hours == 1) ? "1 hour ago" : "$hours hours ago";
    else if ($days <= 7) return ($days == 1) ? "yesterday" : "$days days ago";
    else if ($weeks <= 4.3) return ($weeks == 1) ? "1 week ago" : "$weeks weeks ago";
    else if ($months <= 12) return ($months == 1) ? "1 month ago" : "$months months ago";
    else return ($years == 1) ? "1 year ago" : "$years years ago";
}
?>

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Editing:functions.php