Required: MySQL 4 >= 4.0 is required

hi Team

am having a problem installing my application in php for chatting with my customers but the thing is every time i get in to a step of database in mysql i get an error saying that PERMISSIONS CHECK Required: MySQL 4 >= 4.0 is required. my mysql version is 5.6.x so how can i get read of this error so that i can proceed with my installation with out a problem?

below is my connection code

-----------------------



function siteURL()
{
$protocol = (!empty($_SERVER['HTTPS']) && $_SERVER['HTTPS'] !== 'off' || $_SERVER['SERVER_PORT'] == 443) ? "https://" : "http://";
$domainName = $_SERVER['HTTP_HOST'] . '/';
return $protocol . $domainName;
}

define('SITE_URL', siteURL());

$current_directory = getcwd();
$curArr = explode('/', $current_directory);
unset($curArr[count($curArr) - 1]);
$appPath = implode('/', $curArr);
$appDir = str_replace("/install/install.php", "", $_SERVER['REQUEST_URI']);

$isInstalled = false;
if (file_exists($appPath . '/data/config/config.php')) {
$isInstalled = true;
header('Location: ' . siteURL() . $appDir . '/index.php');
die();
}

if (isset($_POST['install']) && !$isInstalled) {
$error = '';

if (substr(sprintf('%o', fileperms($appPath . '/engine/data/')), -4) != '0777') {
$error .= 'Please set writing permission (0777) on /engine/data<br />';
}

if (substr(sprintf('%o', fileperms($appPath . '/data/config/')), -4) != '0777') {
$error .= 'Please set writing permission (0777) on /data/config<br />';
}

if (!in_array('zlib', get_loaded_extensions())) {
$error .= 'The ZipArchive class uses the functions of » zlib<br />';
}

if (!function_exists('fopen')) {
$error .= 'Function "fopen" should be active<br />';
}

if (!function_exists('curl_init')) {
$error .= 'Function "curl" should be active<br />';
}

if (!function_exists('scandir')) {
$error .= 'Function "scandir" should be active<br />';
}

if (!function_exists('mysql_connect')) {
$error .= 'Function "mysql_connect" should be active<br />';
} else {
if (!version_compare("4.0", phpinfo_array('mysql', 'client_api_version'), "<=")) {
$error .= 'MySQL 4 >= 4.0 is required<br />';
}
}

if (!version_compare("5.2", phpversion(), "<=")) {
$error .= 'PHP 5 >= 5.2 is required<br />';
}


if (phpinfo_array('apache2handler') && phpinfo_array('apache2handler',
'loaded_modules') && strpos(phpinfo_array('apache2handler', 'loaded_modules'), 'mod_rewrite') === false
) {
$error .= 'Apache mod_rewrite is required<br />';
}

if (!version_compare("2.0", preg_replace('/([^0-9.]{1,})/i', '$2', phpinfo_array('gd', 'gd_version')), "<=")) {
$error .= 'PHP GD2 >= 2.0 is required<br />';
}

if ($error == '') {
$complete = 'yes';
}

} else {
$_POST['mysql_host'] = '';
$_POST['mysql_user'] = '';
$_POST['mysql_pass'] = '';
$_POST['mysql_db'] = '';
$_POST['admin_username'] = '';
$_POST['admin_password'] = '';
$_POST['admin_mail'] = '';
}