t uses Opera advanced server compression technology to compress web content before it gets to a device.
	 *  The rendering engine is on Opera's server.)
	 *
	 * Opera/9.80 (Windows NT 6.1; Opera Mobi/14316; U; en) Presto/2.7.81 Version/11.00"
	 * Opera/9.50 (Nintendo DSi; Opera/507; U; en-US)
	 */
	public static function is_opera_mobile() {
		if ( empty( $_SERVER['HTTP_USER_AGENT'] ) ) {
			return false;
		}

		$ua = strtolower( wp_unslash( $_SERVER['HTTP_USER_AGENT'] ) ); // phpcs:ignore WordPress.Security.ValidatedSanitizedInput.InputNotSanitized -- This is validating.

		if ( strpos( $ua, 'opera' ) !== false && strpos( $ua, 'mobi' ) !== false ) {
			return true;
		} elseif ( strpos( $ua, 'opera' ) !== false && strpos( $ua, 'nintendo dsi' ) !== false ) {
			return true;
		} else {
			return false;
		}
	}

	/**
	 * Detects if the current browser is Opera Mini
	 *
	 * Opera/8.01 (J2ME/MIDP; Opera Mini/3.0.6306/1528; en; U; ssr)
	 * Opera/9.80 (Android;Opera Mini/6.0.24212/24.746 U;en) Presto/2.5.25 Version/10.5454
	 * Opera/9.80 (iPhone; Opera Mini/5.0.019802/18.738; U; en) Presto/2.4.15
	 * Opera/9.80 (J2ME/iPhone;Opera Mini/5.0.019802/886; U; ja) Presto/2.4.15
	 * Opera/9.80 (J2ME/iPhone;Opera Mini/5.0.019802/886; U; ja) Presto/2.4.15
	 * Opera/9.80 (Series 60; Opera Mini/5.1.22783/23.334; U; en) Presto/2.5.25 Version/10.54
	 * Opera/9.80 (BlackBerry; Opera Mini/5.1.22303/22.387; U; en) Presto/2.5.25 Version/10.54
	 */
	public static function is_opera_mini() {
		if ( empty( $_SERVER['HTTP_USER_AGENT'] ) ) {
			return false;
		}

		$ua = strtolower( wp_unslash( $_SERVER['HTTP_USER_AGENT'] ) ); // phpcs:ignore WordPress.Security.ValidatedSanitizedInput.InputNotSanitized -- This is validating.

		if ( strpos( $ua, 'opera' ) !== false && strpos( $ua, 'mini' ) !== false ) {
			return true;
		} else {
			return false;
		}
	}

	/**
	 * Detects if the current browser is Opera Mini, but not on a smart device OS(Android, iOS, etc)
	 * Used to send users on dumb devices to m.wor
	 */
	public static function is_opera_mini_dumb() {
		if ( empty( $_SERVER['HTTP_USER_AGENT'] ) ) {
			return false;
		}
		$ua = strtolower( wp_unslash( $_SERVER['HTTP_USER_AGENT'] ) ); // phpcs:ignore WordPress.Security.ValidatedSanitizedInput.InputNotSanitized -- This is validating.

		if ( self::is_opera_mini() ) {
			if ( strpos( $ua, 'android' ) !== false || strpos( $ua, 'iphone' ) !== false || strpos( $ua, 'ipod' ) !== false
			|| strpos( $ua, 'ipad' ) !== false || strpos( $ua, 'blackberry' ) !== false ) {
				return false;
			} else {
				return true;
			}
		} else {
			return false;
		}
	}

	/**
	 * Detects if the current browser is a Windows Phone 7 device.
	 * ex: Mozilla/4.0 (compatible; MSIE 7.0; Windows Phone OS 7.0; Trident/3.1; IEMobile/7.0; LG; GW910)
	 */
	public static function is_WindowsPhone7() {
		if ( empty( $_SERVER['HTTP_USER_AGENT'] ) ) {
			return false;
		}

		$ua = strtolower( wp_unslash( $_SERVER['HTTP_USER_AGENT'] ) ); // phpcs:ignore WordPress.Security.ValidatedSanitizedInput.InputNotSanitized -- This is validating.

		if ( false === strpos( $ua, 'windows phone os 7' ) ) {
			return false;
		} elseif ( self::is_opera_mini() || self::is_opera_mobile() || self::is_firefox_mobile() ) {
			return false;
		} else {
			return true;
		}
	}

	/**
	 * Detects if the current browser is a Windows Phone 8 device.
	 * ex: Mozilla/5.0 (compatible; MSIE 10.0; Windows Phone 8.0; Trident/6.0; ARM; Touch; IEMobile/10.0; <Manufacturer>; <Device> [;<Operator>])
	 */
	public static function is_windows_phone_8() {
		if ( empty( $_SERVER['HTTP_USER_AGENT'] ) ) {
			return false;
		}

		$ua = strtolower( wp_unslash( $_SERVER['HTTP_USER_AGENT'] ) ); // phpcs:ignore WordPress.Security.ValidatedSanitizedInput.InputNotSanitized -- This is validating.
		if ( strpos( $ua, 'windows phone 8' ) === false ) {
			return false;
		} else {
			return true;
		}
	}

	/**
	 * Detects if the current browser is on a Palm device running the new WebOS. This EXCLUDES TouchPad.
	 *
	 * Ex1: Mozilla/5.0 (webOS/1.4.0; U; en-US) AppleWebKit/532.2 (KHTML, like Gecko) Version/1.0 Safari/532.2 Pre/1.1
	 * Ex2: Mozilla/5.0 (webOS/1.4.0; U; en-US) AppleWebKit/532.2 (KHTML, like Gecko) Version/1.0 Safari/532.2 Pixi/1.1
	 */
	public static function is_PalmWebOS() {
		if ( empty( $_SERVER['HTTP_USER_AGENT'] ) ) {
			return false;
		}

		$ua = strtolower( wp_unslash( $_SERVER['HTTP_USER_AGENT'] ) ); // phpcs:ignore WordPress.Security.ValidatedSanitizedInput.InputNotSanitized -- This is validating.

		if ( false === strpos( $ua, 'webos' ) ) {
			return false;
		} elseif ( self::is_opera_mini() || self::is_opera_mobile() || self::is_firefox_mobile() ) {
			return false;
		} else {
			return true;
		}
	}

	/**
	 * Detects if the current browser is the HP TouchPad default browser. This excludes phones wt WebOS.
	 *
	 * TouchPad Emulator: Mozilla/5.0 (hp-desktop; Linux; hpwOS/2.0; U; it-IT) AppleWebKit/534.6 (KHTML, like Gecko) wOSBrowser/233.70 Safari/534.6 Desktop/1.0
	 * TouchPad: Mozilla/5.0 (hp-tablet; Linux; hpwOS/3.0.0; U; en-US) AppleWebKit/534.6 (KHTML, like Gecko) wOSBrowser/233.70 Safari/534.6 TouchPad/1.0
	 */
	public static function is_TouchPad() {
		if ( empty( $_SERVER['HTTP_USER_AGENT'] ) ) {
			return false;
		}

		$http_user_agent = strtolower( wp_unslash( $_SERVER['HTTP_USER_AGENT'] ) ); // phpcs:ignore WordPress.Security.ValidatedSanitizedInput.InputNotSanitized -- This is validating.
		if ( false !== strpos( $http_user_agent, 'hp-tablet' ) || false !== strpos( $http_user_agent, 'hpwos' ) || false !== strpos( $http_user_agent, 'touchpad' ) ) {
			if ( self::is_opera_mini() || self::is_opera_mobile() || self::is_firefox_mobile() ) {
				return false;
			} else {
				return true;
			}
		} else {
			return false;
		}
	}

	/**
	 * Detects if the current browser is the Series 60 Open Source Browser.
	 *
	 * OSS Browser 3.2 on E75: Mozilla/5.0 (SymbianOS/9.3; U; Series60/3.2 NokiaE75-1/110.48.125 Profile/MIDP-2.1 Configuration/CLDC-1.1 ) AppleWebKit/413 (KHTML, like Gecko) Safari/413
	 *
	 * 7.0 Browser (Nokia 5800 XpressMusic (v21.0.025)) : Mozilla/5.0 (SymbianOS/9.4; U; Series60/5.0 Nokia5800d-1/21.0.025; Profile/MIDP-2.1 Configuration/CLDC-1.1 ) AppleWebKit/413 (KHTML, like Gecko) Safari/413
	 *
	 * Browser 7.1 (Nokia N97 (v12.0.024)) : Mozilla/5.0 (SymbianOS/9.4; Series60/5.0 NokiaN97-1/12.0.024; Profile/MIDP-2.1 Configuration/CLDC-1.1; en-us) AppleWebKit/525 (KHTML, like Gecko) BrowserNG/7.1.12344
	 */
	public static function is_S60_OSSBrowser() {

		if ( empty( $_SERVER['HTTP_USER_AGENT'] ) ) {
			return false;
		}

		$agent = strtolower( wp_unslash( $_SERVER['HTTP_USER_AGENT'] ) ); // phpcs:ignore WordPress.Security.ValidatedSanitizedInput.InputNotSanitized -- This is validating.
		if ( self::is_opera_mini() || self::is_opera_mobile() || self::is_firefox_mobile() ) {
			return false;
		}

		$pos_webkit = strpos( $agent, 'webkit' );
		if ( false !== $pos_webkit ) {
			// First, test for WebKit, then make sure it's either Symbian or S60.
			if ( strpos( $agent, 'symbian' ) !== false || strpos( $agent, 'series60' ) !== false ) {
					return true;
			} else {
				return false;
			}
		} elseif ( strpos( $agent, 'symbianos' ) !== false && strpos( $agent, 'series60' ) !== false ) {
			return true;
		} elseif ( strpos( $agent, 'nokia' ) !== false && strpos( $agent, 'series60' ) !== false ) {
			return true;
		}

		return false;
	}

	/**
	 * Detects if the device platform is the Symbian Series 60.
	 */
	public static function is_symbian_platform() {

		if ( empty( $_SERVER['HTTP_USER_AGENT'] ) ) {
			return false;
		}

		$agent = strtolower( wp_unslash( $_SERVER['HTTP_USER_AGENT'] ) ); // phpcs:ignore WordPress.Security.ValidatedSanitizedInput.InputNotSanitized -- This is validating.

		$pos_webkit = strpos( $agent, 'webkit' );
		if ( false !== $pos_webkit ) {
			// First, test for WebKit, then make sure it's either Symbian or S60.
			if ( strpos( $agent, 'symbian' ) !== false || strpos( $agent, 'series60' ) !== false ) {
					return true;
			} else {
				return false;
			}
		} elseif ( strpos( $agent, 'symbianos' ) !== false && strpos( $agent, 'series60' ) !== false ) {
			return true;
		} elseif ( strpos( $agent, 'nokia' ) !== false && strpos( $agent, 'series60' ) !== false ) {
			return true;
		} elseif ( strpos( $agent, 'opera mini' ) !== false ) {
			if ( strpos( $agent, 'symbianos' ) !== false || strpos( $agent, 'symbos' ) !== false || strpos( $agent, 'series 60' ) !== false ) {
				return true;
			}
		}

		return false;
	}

	/**
	 * Detects if the device platform is the Symbian Series 40.
	 * Nokia Browser for Series 40 is a proxy based browser, previously known as Ovi Browser.
	 * This browser will report 'NokiaBrowser' in the header, however some older version will also report 'OviBrowser'.
	 */
	public static function is_symbian_s40_platform() {

		if ( empty( $_SERVER['HTTP_USER_AGENT'] ) ) {
			return false;
		}

		$agent = strtolower( wp_unslash( $_SERVER['HTTP_USER_AGENT'] ) ); // phpcs:ignore WordPress.Security.ValidatedSanitizedInput.InputNotSanitized -- This is validating.

		if ( strpos( $agent, 'series40' ) !== false ) {
			if ( strpos( $agent, 'nokia' ) !== false || strpos( $agent, 'ovibrowser' ) !== false || strpos( $agent, 'nokiabrowser' ) !== false ) {
				return true;
			}
		}

		return false;
	}

	/**
	 * Returns if the device belongs to J2ME capable family.
	 *
	 * @return bool
	 */
	public static function is_J2ME_platform() {

		if ( empty( $_SERVER['HTTP_USER_AGENT'] ) ) {
			return false;
		}

		$agent = strtolower( wp_unslash( $_SERVER['HTTP_USER_AGENT'] ) ); // phpcs:ignore WordPress.Security.ValidatedSanitizedInput.InputNotSanitized -- This is validating.

		if ( strpos( $agent, 'j2me/midp' ) !== false ) {
			return true;
		} elseif ( strpos( $agent, 'midp' ) !== false && strpos( $agent, 'cldc' ) ) {
			return true;
		}
		return false;
	}

	/**
	 * Detects if the current UA is on one of the Maemo-based Nokia Internet Tablets.
	 */
	public static function is_MaemoTablet() {

		if ( empty( $_SERVER['HTTP_USER_AGENT'] ) ) {
			return false;
		}

		$agent = strtolower( wp_unslash( $_SERVER['HTTP_USER_AGENT'] ) ); // phpcs:ignore WordPress.Security.ValidatedSanitizedInput.InputNotSanitized -- This is validating.

		$pos_maemo = strpos( $agent, 'maemo' );
		if ( false === $pos_maemo ) {
			return false;
		}

		// Must be Linux + Tablet, or else it could be something else.
		if ( strpos( $agent, 'tablet' ) !== false && strpos( $agent, 'linux' ) !== false ) {
			if ( self::is_opera_mini() || self::is_opera_mobile() || self::is_firefox_mobile() ) {
				return false;
			} else {
				return true;
			}
		} else {
			return false;
		}
	}

	/**
	 * Detects if the current UA is a MeeGo device (Nokia Smartphone).
	 */
	public static function is_MeeGo() {

		if ( empty( $_SERVER['HTTP_USER_AGENT'] ) ) {
			return false;
		}

		$ua = strtolower( wp_unslash( $_SERVER['HTTP_USER_AGENT'] ) ); // phpcs:ignore WordPress.Security.ValidatedSanitizedInput.InputNotSanitized -- This is validating.

		if ( false === strpos( $ua, 'meego' ) ) {
			return false;
		} elseif ( self::is_opera_mini() || self::is_opera_mobile() || self::is_firefox_mobile() ) {
			return false;
		} else {
			return true;
		}
	}

	/**
	 * The is_webkit() method can be used to check the User Agent for an webkit generic browser.
	 */
	public static function is_webkit() {

		if ( empty( $_SERVER['HTTP_USER_AGENT'] ) ) {
			return false;
		}

		$agent = strtolower( wp_unslash( $_SERVER['HTTP_USER_AGENT'] ) ); // phpcs:ignore WordPress.Security.ValidatedSanitizedInput.InputNotSanitized -- This is validating.

		$pos_webkit = strpos( $agent, 'webkit' );

		if ( false !== $pos_webkit ) {
			return true;
		} else {
			return false;
		}
	}

	/**
	 * Detects if the current browser is the Native Android browser.
	 *
	 * @return boolean true if the browser is Android otherwise false
	 */
	public static function is_android() {
		if ( empty( $_SERVER['HTTP_USER_AGENT'] ) ) {
			return false;
		}

		$agent       = strtolower( wp_unslash( $_SERVER['HTTP_USER_AGENT'] ) ); // phpcs:ignore WordPress.Security.ValidatedSanitizedInput.InputNotSanitized -- This is validating.
		$pos_android = strpos( $agent, 'android' );
		if ( false !== $pos_android ) {
			if ( self::is_opera_mini() || self::is_opera_mobile() || self::is_firefox_mobile() ) {
				return false;
			} else {
				return true;
			}
		} else {
			return false;
		}
	}

	/**
	 * Detects if the current browser is the Native Android Tablet browser.
	 * Assumes 'Android' should be in the user agent, but not 'mobile'
	 *
	 * @return boolean true if the browser is Android and not 'mobile' otherwise false
	 */
	public static function is_android_tablet() {
		if ( empty( $_SERVER['HTTP_USER_AGENT'] ) ) {
			return false;
		}

		$agent = strtolower( wp_unslash( $_SERVER['HTTP_USER_AGENT'] ) ); // phpcs:ignore WordPress.Security.ValidatedSanitizedInput.InputNotSanitized -- This is validating.

		$pos_android      = strpos( $agent, 'android' );
		$pos_mobile       = strpos( $agent, 'mobile' );
		$post_android_app = strpos( $agent, 'wp-android' );

		if ( false !== $pos_android && false === $pos_mobile && false === $post_android_app ) {
			if ( self::is_opera_mini() || self::is_opera_mobile() || self::is_firefox_mobile() ) {
				return false;
			} else {
				return true;
			}
		} else {
			return false;
		}
	}

	/**
	 * Detects if the current browser is the Kindle Fire Native browser.
	 *
	 * Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10_6_3; en-us; Silk/1.1.0-84) AppleWebKit/533.16 (KHTML, like Gecko) Version/5.0 Safari/533.16 Silk-Accelerated=true
	 * Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10_6_3; en-us; Silk/1.1.0-84) AppleWebKit/533.16 (KHTML, like Gecko) Version/5.0 Safari/533.16 Silk-Accelerated=false
	 *
	 * @return boolean true if the browser is Kindle Fire Native browser otherwise false
	 */
	public static function is_kindle_fire() {
		if ( empty( $_SERVER['HTTP_USER_AGENT'] ) ) {
			return false;
		}

		$agent        = strtolower( wp_unslash( $_SERVER['HTTP_USER_AGENT'] ) ); // phpcs:ignore WordPress.Security.ValidatedSanitizedInput.InputNotSanitized -- This is validating.
		$pos_silk     = strpos( $agent, 'silk/' );
		$pos_silk_acc = strpos( $agent, 'silk-accelerated=' );
		if ( false !== $pos_silk && false !== $pos_silk_acc ) {
			return true;
		} else {
			return false;
		}
	}

	/**
	 * Detects if the current browser is the Kindle Touch Native browser
	 *
	 * Mozilla/5.0 (X11; U; Linux armv7l like Android; en-us) AppleWebKit/531.2+ (KHTML, like Gecko) Version/5.0 Safari/533.2+ Kindle/3.0+
	 *
	 * @return boolean true if the browser is Kindle monochrome Native browser otherwise false
	 */
	public static function is_kindle_touch() {
		if ( empty( $_SERVER['HTTP_USER_AGENT'] ) ) {
			return false;
		}
		$agent            = strtolower( wp_unslash( $_SERVER['HTTP_USER_AGENT'] ) ); // phpcs:ignore WordPress.Security.ValidatedSanitizedInput.InputNotSanitized -- This is validating.
		$pos_kindle_touch = strpos( $agent, 'kindle/3.0+' );
		if ( false !== $pos_kindle_touch && false === self::is_kindle_fire() ) {
			return true;
		} else {
			return false;
		}
	}

	/**
	 * Detect if user agent is the WordPress.com Windows 8 app (used ONLY on the custom oauth stylesheet)
	 */
	public static function is_windows8_auth() {
		if ( empty( $_SERVER['HTTP_USER_AGENT'] ) ) {
			return false;
		}

		$agent = strtolower( wp_unslash( $_SERVER['HTTP_USER_AGENT'] ) ); // phpcs:ignore WordPress.Security.ValidatedSanitizedInput.InputNotSanitized -- This is validating.
		$pos   = strpos( $agent, 'msauthhost' );
		if ( false !== $pos ) {
			return true;
		} else {
			return false;
		}
	}

	/**
	 * Detect if user agent is the WordPress.com Windows 8 app.
	 */
	public static function is_wordpress_for_win8() {
		if ( empty( $_SERVER['HTTP_USER_AGENT'] ) ) {
			return false;
		}

		$agent = strtolower( wp_unslash( $_SERVER['HTTP_USER_AGENT'] ) ); // phpcs:ignore WordPress.Security.ValidatedSanitizedInput.InputNotSanitized -- This is validating.
		$pos   = strpos( $agent, 'wp-windows8' );
		if ( false !== $pos ) {
			return true;
		} else {
			return false;
		}
	}

	/**
	 * Detect if user agent is the WordPress.com Desktop app.
	 */
	public static function is_wordpress_desktop_app() {
		if ( empty( $_SERVER['HTTP_USER_AGENT'] ) ) {
			return false;
		}

		$agent = strtolower( wp_unslash( $_SERVER['HTTP_USER_AGENT'] ) ); // phpcs:ignore WordPress.Security.ValidatedSanitizedInput.InputNotSanitized -- This is validating.
		$pos   = strpos( $agent, 'WordPressDesktop' );
		if ( false !== $pos ) {
			return true;
		} else {
			return false;
		}
	}

	/**
	 * The is_blackberry_tablet() method can be used to check the User Agent for a RIM blackberry tablet.
	 * The user agent of the BlackBerry® Tablet OS follows a format similar to the following:
	 * Mozilla/5.0 (PlayBook; U; RIM Tablet OS 1.0.0; en-US) AppleWebKit/534.8+ (KHTML, like Gecko) Version/0.0.1 Safari/534.8+
	 */
	public static function is_blackberry_tablet() {

		if ( empty( $_SERVER['HTTP_USER_AGENT'] ) ) {
			return false;
		}

		$agent          = strtolower( wp_unslash( $_SERVER['HTTP_USER_AGENT'] ) ); // phpcs:ignore WordPress.Security.ValidatedSanitizedInput.InputNotSanitized -- This is validating.
		$pos_playbook   = stripos( $agent, 'PlayBook' );
		$pos_rim_tablet = stripos( $agent, 'RIM Tablet' );

		if ( ( false === $pos_playbook ) || ( false === $pos_rim_tablet ) ) {
			return false;
		} else {
			return true;
		}
	}

	/**
	 * The is_blackbeberry() method can be used to check the User Agent for a blackberry device.
	 * Note that opera mini on BB matches this rule.
	 */
	public static function is_blackbeberry() {
		if ( empty( $_SERVER['HTTP_USER_AGENT'] ) ) {
			return false;
		}

		$agent = strtolower( wp_unslash( $_SERVER['HTTP_USER_AGENT'] ) ); // phpcs:ignore WordPress.Security.ValidatedSanitizedInput.InputNotSanitized -- This is validating.

		$pos_blackberry = strpos( $agent, 'blackberry' );
		if ( false !== $pos_blackberry ) {
			if ( self::is_opera_mini() || self::is_opera_mobile() || self::is_firefox_mobile() ) {
				return false;
			} else {
				return true;
			}
		} else {
			return false;
		}
	}

	/**
	 * The is_blackberry_10() method can be used to check the User Agent for a BlackBerry 10 device.
	 */
	public static function is_blackberry_10() {
		if ( empty( $_SERVER['HTTP_USER_AGENT'] ) ) {
			return false;
		}
		$agent = strtolower( wp_unslash( $_SERVER['HTTP_USER_AGENT'] ) ); // phpcs:ignore WordPress.Security.ValidatedSanitizedInput.InputNotSanitized -- This is validating.
		return ( strpos( $agent, 'bb10' ) !== false ) && ( strpos( $agent, 'mobile' ) !== false );
	}

	/**
	 * Retrieve the blackberry OS version.
	 *
	 * Return strings are from the following list:
	 * - blackberry-10
	 * - blackberry-7
	 * - blackberry-6
	 * - blackberry-torch //only the first edition. The 2nd edition has the OS7 onboard and doesn't need any special rule.
	 * - blackberry-5
	 * - blackberry-4.7
	 * - blackberry-4.6
	 * - blackberry-4.5
	 *
	 * @return string Version of the BB OS.
	 * If version is not found, get_blackbeberry_OS_version will return boolean false.
	 */
	public static function get_blackbeberry_OS_version() {

		if ( empty( $_SERVER['HTTP_USER_AGENT'] ) ) {
			return false;
		}

		if ( self::is_blackberry_10() ) {
			return 'blackberry-10';
		}

		$agent = strtolower( wp_unslash( $_SERVER['HTTP_USER_AGENT'] ) ); // phpcs:ignore WordPress.Security.ValidatedSanitizedInput.InputNotSanitized -- This is validating.

		$pos_blackberry = stripos( $agent, 'blackberry' );
		if ( false === $pos_blackberry ) {
			// Not a blackberry device.
			return false;
		}

		// Blackberry devices OS 6.0 or higher.
		// Mozilla/5.0 (BlackBerry; U; BlackBerry 9670; en) AppleWebKit/534.3+ (KHTML, like Gecko) Version/6.0.0.286 Mobile Safari/534.3+.
		// Mozilla/5.0 (BlackBerry; U; BlackBerry 9800; en) AppleWebKit/534.1+ (KHTML, Like Gecko) Version/6.0.0.141 Mobile Safari/534.1+.
		// Mozilla/5.0 (BlackBerry; U; BlackBerry 9900; en-US) AppleWebKit/534.11+ (KHTML, like Gecko) Version/7.0.0 Mobile Safari/534.11+.
		$pos_webkit = stripos( $agent, 'webkit' );
		if ( false !== $pos_webkit ) {
			// Detected blackberry webkit browser.
			$pos_torch = stripos( $agent, 'BlackBerry 9800' );
			if ( false !== $pos_torch ) {
				return 'blackberry-torch'; // Match the torch first edition. the 2nd edition should use the OS7 and doesn't need any special rule.
			} elseif ( preg_match( '#Version\/([\d\.]+)#i', $agent, $matches ) ) { // Detecting the BB OS version for devices running OS 6.0 or higher.
				$version     = $matches[1];
				$version_num = explode( '.', $version );
				if ( false === is_array( $version_num ) || count( $version_num ) <= 1 ) {
					return 'blackberry-6'; // not a BB device that match our rule.
				} else {
					return 'blackberry-' . $version_num[0];
				}
			} else {
				// if doesn't match returns the minimun version with a webkit browser. we should never fall here.
				return 'blackberry-6'; // not a BB device that match our rule.
			}
		}

		// Blackberry devices <= 5.XX.
		// BlackBerry9000/5.0.0.93 Profile/MIDP-2.0 Configuration/CLDC-1.1 VendorID/179.
		if ( preg_match( '#BlackBerry\w+\/([\d\.]+)#i', $agent, $matches ) ) {
			$version = $matches[1];
		} else {
			return false; // not a BB device that match our rule.
		}

		$version_num = explode( '.', $version );

		if ( is_array( $version_num ) === false || count( $version_num ) <= 1 ) {
			return false;
		}

		$version_num_major = (int) $version_num[0];
		$version_num_minor = (int) $version_num[1];

		if ( 5 === $version_num_major ) {
			return 'blackberry-5';
		} elseif ( 4 === $version_num_major && 7 === $version_num_minor ) {
			return 'blackberry-4.7';
		} elseif ( 4 === $version_num_major && 6 === $version_num_minor ) {
			return 'blackberry-4.6';
		} elseif ( 4 === $version_num_major && 5 === $version_num_minor ) {
			return 'blackberry-4.5';
		} else {
			return false;
		}
	}

	/**
	 * Retrieve the blackberry browser version.
	 *
	 * Return string are from the following list:
	 * - blackberry-10
	 * - blackberry-webkit
	 * - blackberry-5
	 * - blackberry-4.7
	 * - blackberry-4.6
	 *
	 * @return string Type of the BB browser.
	 * If browser's version is not found, detect_blackbeberry_browser_version will return boolean false.
	 */
	public static function detect_blackberry_browser_version() {

		if ( empty( $_SERVER['HTTP_USER_AGENT'] ) ) {
			return false;
		}

		$agent = strtolower( wp_unslash( $_SERVER['HTTP_USER_AGENT'] ) ); // phpcs:ignore WordPress.Security.ValidatedSanitizedInput.InputNotSanitized -- This is validating.

		if ( self::is_blackberry_10() ) {
			return 'blackberry-10';
		}

		$pos_blackberry = strpos( $agent, 'blackberry' );
		if ( false === $pos_blackberry ) {
			// Not a blackberry device.
			return false;
		}

		$pos_webkit = strpos( $agent, 'webkit' );

		if ( ! ( false === $pos_webkit ) ) {
			return 'blackberry-webkit';
		} else {
			if ( ! preg_match( '#BlackBerry\w+\/([\d\.]+)#i', $agent, $matches ) ) {
				return false; // not a BB device that match our rule.
			}

			$version_num = explode( '.', $matches[1] );

			if ( false === is_array( $version_num ) || count( $version_num ) <= 1 ) {
				return false;
			}

			$version_num_major = (int) $version_num[0];
			$version_num_minor = (int) $version_num[1];

			if ( 5 === $version_num_major ) {
				return 'blackberry-5';
			} elseif ( 4 === $version_num_major && 7 === $version_num_minor ) {
				return 'blackberry-4.7';
			} elseif ( 4 === $version_num_major && 6 === $version_num_minor ) {
				return 'blackberry-4.6';
			} else {
				// A very old BB device is found or this is a BB device that doesn't match our rules.
				return false;
			}
		}
	}

	/**
	 * Checks if a visitor is coming from one of the WordPress mobile apps.
	 *
	 * @return bool
	 */
	public static function is_mobile_app() {

		if ( empty( $_SERVER['HTTP_USER_AGENT'] ) ) {
			return false;
		}

		$agent = strtolower( wp_unslash( $_SERVER['HTTP_USER_AGENT'] ) ); // phpcs:ignore WordPress.Security.ValidatedSanitizedInput.InputNotSanitized -- This is validating.

		if ( isset( $_SERVER['X_USER_AGENT'] ) && preg_match( '|wp-webos|', $_SERVER['X_USER_AGENT'] ) ) { // phpcs:ignore WordPress.Security.ValidatedSanitizedInput -- This is validating.
			return true; // Wp4webos 1.1 or higher.
		}

		$app_agents = array( 'wp-android', 'wp-blackberry', 'wp-iphone', 'wp-nokia', 'wp-webos', 'wp-windowsphone' );
		// the mobile reader on iOS has an incorrect UA when loading the reader
		// currently it is the default one provided by the iOS framework which
		// causes problems with 2-step-auth
		// User-Agent   WordPress/3.1.4 CFNetwork/609 Darwin/13.0.0.
		$app_agents[] = 'wordpress/3.1';

		foreach ( $app_agents as $app_agent ) {
			if ( false !== strpos( $agent, $app_agent ) ) {
				return true;
			}
		}
		return false;
	}

	/**
	 * Detects if the current browser is Nintendo 3DS handheld.
	 *
	 * Example: Mozilla/5.0 (Nintendo 3DS; U; ; en) Version/1.7498.US
	 * can differ in language, version and region
	 */
	public static function is_Nintendo_3DS() {
		if ( empty( $_SERVER['HTTP_USER_AGENT'] ) ) {
			return false;
		}

		$ua = strtolower( wp_unslash( $_SERVER['HTTP_USER_AGENT'] ) ); // phpcs:ignore WordPress.Security.ValidatedSanitizedInput.InputNotSanitized -- This is validating.
		if ( strpos( $ua, 'nintendo 3ds' ) !== false ) {
			return true;
		}
		return false;
	}

	/**
	 * Was the current request made by a known bot?
	 *
	 * @return boolean
	 */
	public static function is_bot() {
		static $is_bot = null;

		if ( empty( $_SERVER['HTTP_USER_AGENT'] ) ) {
			return false;
		}

		if ( $is_bot === null ) {
			$is_bot = self::is_bot_user_agent( wp_unslash( $_SERVER['HTTP_USER_AGENT'] ) ); // phpcs:ignore WordPress.Security.ValidatedSanitizedInput.InputNotSanitized -- This is validating.
		}

		return $is_bot;
	}

	/**
	 * Is the given user-agent a known bot?
	 * If you want an is_bot check for the current request's UA, use is_bot() instead of passing a user-agent to this method.
	 *
	 * @param string $ua A user-agent string.
	 *
	 * @return boolean
	 */
	public static function is_bot_user_agent( $ua = null ) {

		if ( empty( $ua ) ) {
			return false;
		}

		$bot_agents = array(
			'alexa',
			'altavista',
			'ask jeeves',
			'attentio',
			'baiduspider',
			'bingbot',
			'chtml generic',
			'crawler',
			'fastmobilecrawl',
			'feedfetcher-google',
			'firefly',
			'froogle',
			'gigabot',
			'googlebot',
			'googlebot-mobile',
			'heritrix',
			'httrack',
			'ia_archiver',
			'irlbot',
			'iescholar',
			'infoseek',
			'jumpbot',
			'linkcheck',
			'lycos',
			'mediapartners',
			'mediobot',
			'motionbot',
			'msnbot',
			'mshots',
			'openbot',
			'pss-webkit-request',
			'pythumbnail',
			'scooter',
			'slurp',
			'snapbot',
			'spider',
			'taptubot',
			'technoratisnoop',
			'teoma',
			'twiceler',
			'yahooseeker',
			'yahooysmcm',
			'yammybot',
			'ahrefsbot',
			'pingdom.com_bot',
			'kraken',
			'yandexbot',
			'twitterbot',
			'tweetmemebot',
			'openhosebot',
			'queryseekerspider',
			'linkdexbot',
			'grokkit-crawler',
			'livelapbot',
			'germcrawler',
			'domaintunocrawler',
			'grapeshotcrawler',
			'cloudflare-alwaysonline',
			'cookieinformationscanner', // p1699315886066389-slack-C0438NHCLSY
			'facebookexternalhit', // https://www.facebook.com/externalhit_uatext.php
		);

		foreach ( $bot_agents as $bot_agent ) {
			if ( false !== stripos( $ua, $bot_agent ) ) {
				return true;
			}
		}

		return false;
	}
}