diff --git a/include/Contact.php b/include/Contact.php
index 1e393895fb..fc9f660f13 100644
--- a/include/Contact.php
+++ b/include/Contact.php
@@ -127,7 +127,7 @@ function mark_for_death($contact) {
 	if($contact['archive'])
 		return;
 
-	if($contact['term-date'] <= NULL_DATE) {
+	if ($contact['term-date'] <= NULL_DATE) {
 		q("UPDATE `contact` SET `term-date` = '%s' WHERE `id` = %d",
 				dbesc(datetime_convert()),
 				intval($contact['id'])
diff --git a/include/datetime.php b/include/datetime.php
index fd60f5fd96..9e1d4b55c9 100644
--- a/include/datetime.php
+++ b/include/datetime.php
@@ -171,7 +171,7 @@ function dob($dob) {
 	$f = get_config('system','birthday_input_format');
 	if(! $f)
 		$f = 'ymd';
-	if($dob == '0000-00-00')
+	if($dob === '0000-00-00')
 		$value = '';
 	else
 		$value = (($year) ? datetime_convert('UTC','UTC',$dob,'Y-m-d') : datetime_convert('UTC','UTC',$dob,'m-d'));
diff --git a/include/dfrn.php b/include/dfrn.php
index de64c37d67..25f8c9358e 100644
--- a/include/dfrn.php
+++ b/include/dfrn.php
@@ -1094,7 +1094,7 @@ class dfrn {
 			return 3;
 		}
 
-		if($contact['term-date'] > NULL_DATE) {
+		if ($contact['term-date'] > NULL_DATE) {
 			logger("dfrn_deliver: $url back from the dead - removing mark for death");
 			require_once('include/Contact.php');
 			unmark_for_death($contact);
diff --git a/include/security.php b/include/security.php
index a9d2f83de8..05371f71ca 100644
--- a/include/security.php
+++ b/include/security.php
@@ -55,7 +55,7 @@ function authenticate_success($user_record, $login_initial = false, $interactive
 	$a->user = $user_record;
 
 	if($interactive) {
-		if($a->user['login_date'] <= NULL_DATE) {
+		if ($a->user['login_date'] <= NULL_DATE) {
 			$_SESSION['return_url'] = 'profile_photo/new';
 			$a->module = 'profile_photo';
 			info( t("Welcome ") . $a->user['username'] . EOL);
diff --git a/mod/contacts.php b/mod/contacts.php
index 5fdcb7036d..0569c8ca4e 100644
--- a/mod/contacts.php
+++ b/mod/contacts.php
@@ -538,7 +538,7 @@ function contacts_content(App $a) {
 				? t('Never')
 				: datetime_convert('UTC',date_default_timezone_get(),$contact['last-update'],'D, j M Y, g:i A'));
 
-		if($contact['last-update'] > NULL_DATE)
+		if ($contact['last-update'] > NULL_DATE)
 			$last_update .= ' ' . (($contact['last-update'] <= $contact['success_update']) ? t("\x28Update was successful\x29") : t("\x28Update was not successful\x29"));
 
 		$lblsuggest = (($contact['network'] === NETWORK_DFRN) ? t('Suggest friends') : '');