Changes:

- added some type-hints
- replaced most double-quotes (only Diaspora.php, later more) with single
- added some documentation
- normalized indenting in Diaspora.php (I hope I got all?)

src/Content/Widget.php

@@ -45,7 +45,7 @@ class Widget
 	 * @return string
 	 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 	 */
-	public static function follow(string $value = ""): string
+	public static function follow(string $value = ''): string
 	{
 		return Renderer::replaceMacros(Renderer::getMarkupTemplate('widget/follow.tpl'), array(
 			'$connect' => DI::l10n()->t('Add New Contact'),

src/Model/Contact.php

@@ -1553,11 +1553,11 @@ class Contact
 	/**
 	 * Blocks a contact
 	 *
-	 * @param int $cid
-	 * @return bool
-	 * @throws \Exception
+	 * @param int $cid Contact id to block
+	 * @param string $reason Block reason
+	 * @return bool Whether it was successful
 	 */
-	public static function block($cid, $reason = null)
+	public static function block(int $cid, string $reason = null): bool
 	{
 		$return = self::update(['blocked' => true, 'block_reason' => $reason], ['id' => $cid]);
 
@@ -1567,11 +1567,10 @@ class Contact
 	/**
 	 * Unblocks a contact
 	 *
-	 * @param int $cid
-	 * @return bool
-	 * @throws \Exception
+	 * @param int $cid Contact id to unblock
+	 * @return bool Whether it was successfull
 	 */
-	public static function unblock($cid)
+	public static function unblock(int $cid): bool
 	{
 		$return = self::update(['blocked' => false, 'block_reason' => null], ['id' => $cid]);
 
@@ -1581,7 +1580,7 @@ class Contact
 	/**
 	 * Ensure that cached avatar exist
 	 *
-	 * @param integer $cid
+	 * @param integer $cid Contact id
 	 */
 	public static function checkAvatarCache(int $cid)
 	{
@@ -1621,7 +1620,7 @@ class Contact
 	 * @param bool  $no_update Don't perfom an update if no cached avatar was found
 	 * @return string photo path
 	 */
-	private static function getAvatarPath(array $contact, string $size, $no_update = false)
+	private static function getAvatarPath(array $contact, string $size, bool $no_update = false): string
 	{
 		$contact = self::checkAvatarCacheByArray($contact, $no_update);
 
@@ -1655,7 +1654,7 @@ class Contact
 	 * @param bool   $no_update Don't perfom an update if no cached avatar was found
 	 * @return string photo path
 	 */
-	public static function getPhoto(array $contact, bool $no_update = false)
+	public static function getPhoto(array $contact, bool $no_update = false): string
 	{
 		return self::getAvatarPath($contact, Proxy::SIZE_SMALL, $no_update);
 	}
@@ -1667,7 +1666,7 @@ class Contact
 	 * @param bool   $no_update Don't perfom an update if no cached avatar was found
 	 * @return string photo path
 	 */
-	public static function getThumb(array $contact, bool $no_update = false)
+	public static function getThumb(array $contact, bool $no_update = false): string
 	{
 		return self::getAvatarPath($contact, Proxy::SIZE_THUMB, $no_update);
 	}
@@ -1679,7 +1678,7 @@ class Contact
 	 * @param bool   $no_update Don't perfom an update if no cached avatar was found
 	 * @return string photo path
 	 */
-	public static function getMicro(array $contact, bool $no_update = false)
+	public static function getMicro(array $contact, bool $no_update = false): string
 	{
 		return self::getAvatarPath($contact, Proxy::SIZE_MICRO, $no_update);
 	}
@@ -1691,7 +1690,7 @@ class Contact
 	 * @param bool  $no_update Don't perfom an update if no cached avatar was found
 	 * @return array contact array with avatar cache fields
 	 */
-	private static function checkAvatarCacheByArray(array $contact, bool $no_update = false)
+	private static function checkAvatarCacheByArray(array $contact, bool $no_update = false): array
 	{
 		$update = false;
 		$contact_fields = [];
@@ -1797,7 +1796,7 @@ class Contact
 	 * @param string $size    Size of the avatar picture
 	 * @return string avatar URL
 	 */
-	public static function getDefaultAvatar(array $contact, string $size)
+	public static function getDefaultAvatar(array $contact, string $size): string
 	{
 		switch ($size) {
 			case Proxy::SIZE_MICRO:

src/Module/Directory.php

@@ -166,7 +166,7 @@ class Directory extends BaseModule
 			'img_hover'    => $contact['name'],
 			'name'         => $contact['name'],
 			'details'      => $details,
-			'account_type' => (!empty($contact['contact-type']) ? Model\Contact::getAccountType($contact['contact-type']) : ''),
+			'account_type' => Model\Contact::getAccountType($contact['contact-type'] ?? ''),
 			'profile'      => $profile,
 			'location'     => $location_e,
 			'tags'         => $contact['pub_keywords'],

src/Protocol/DFRN.php

@@ -348,7 +348,7 @@ class DFRN
 	 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 	 * @todo  Find proper type-hint for returned type
 	 */
-	private static function addHeader(DOMDocument $doc, array $owner, string $authorelement, string $alternatelink = "", bool $public = false)
+	private static function addHeader(DOMDocument $doc, array $owner, string $authorelement, string $alternatelink = '', bool $public = false)
 	{
 
 		if ($alternatelink == "") {
@@ -1063,7 +1063,7 @@ class DFRN
 	 * @throws \ImagickException
 	 * @todo  Find good type-hints for all parameter
 	 */
-	private static function fetchauthor(\DOMXPath $xpath, \DOMNode $context, array $importer, string $element, bool $onlyfetch, string $xml = ""): array
+	private static function fetchauthor(\DOMXPath $xpath, \DOMNode $context, array $importer, string $element, bool $onlyfetch, string $xml = ''): array
 	{
 		$author = [];
 		$author["name"] = XML::getFirstNodeValue($xpath, $element."/atom:name/text()", $context);