diff --git a/mod/contacts.php b/mod/contacts.php
index 54e9b5b644..c26a1b57b6 100644
--- a/mod/contacts.php
+++ b/mod/contacts.php
@@ -1,7 +1,9 @@
 <?php
+
 /**
  * @file mod/contacts.php
  */
+
 use Friendica\App;
 use Friendica\Content\ContactSelector;
 use Friendica\Core\System;
@@ -30,6 +32,7 @@ function contacts_init(App $a)
 		$a->page['aside'] = '';
 	}
 
+	$contact_id = null;
 	$contact = null;
 	if ((($a->argc == 2) && intval($a->argv[1])) || (($a->argc == 3) && intval($a->argv[1]) && ($a->argv[2] == "posts"))) {
 		$contact_id = intval($a->argv[1]);
@@ -164,11 +167,7 @@ function contacts_post(App $a)
 		return;
 	}
 
-	$orig_record = q("SELECT * FROM `contact` WHERE `id` = %d AND `uid` = %d LIMIT 1",
-		intval($contact_id),
-		intval(local_user())
-	);
-	if (!DBM::is_result($orig_record)) {
+	if (!DBM::exists('contact', ['id' => $contact_id, 'uid' => local_user()])) {
 		notice(t('Could not access contact record.') . EOL);
 		goaway('contacts');
 		return; // NOTREACHED
@@ -178,11 +177,7 @@ function contacts_post(App $a)
 
 	$profile_id = intval($_POST['profile-assign']);
 	if ($profile_id) {
-		$r = q("SELECT `id` FROM `profile` WHERE `id` = %d AND `uid` = %d LIMIT 1",
-			intval($profile_id),
-			intval(local_user())
-		);
-		if (!DBM::is_result($r)) {
+		if (!DBM::exists('profile', ['id' => $profile_id, 'uid' => local_user()])) {
 			notice(t('Could not locate selected profile.') . EOL);
 			return;
 		}
@@ -229,6 +224,7 @@ function contacts_post(App $a)
 
 	return;
 }
+
 /* contact actions */
 
 function _contact_update($contact_id)
@@ -764,7 +760,6 @@ function contacts_content(App $a)
 	$total = 0;
 	$searching = false;
 	$search_hdr = null;
-	$search_txt = '';
 	if ($search) {
 		$searching = true;
 		$search_hdr = $search;
diff --git a/mod/credits.php b/mod/credits.php
index e0e834388f..a501dee1f0 100644
--- a/mod/credits.php
+++ b/mod/credits.php
@@ -5,19 +5,17 @@
  * (only contributors to the git repositories for friendica core and the
  * addons repository will be listed though ATM)
  */
-
 use Friendica\App;
 
-function credits_content(App $a) {
+function credits_content()
+{
 	/* fill the page with credits */
-	$f = fopen('util/credits.txt', 'r');
-	$names = fread($f, filesize('util/credits.txt'));
-	$arr = explode("\n", htmlspecialchars($names));
-	fclose($f);
+	$credits_string = file_get_contents('util/credits.txt');
+	$names = explode("\n", htmlspecialchars($credits_string));
 	$tpl = get_markup_template('credits.tpl');
-	return replace_macros($tpl, array(
+	return replace_macros($tpl, [
 		'$title'  => t('Credits'),
 		'$thanks' => t('Friendica is a community project, that would not be possible without the help of many people. Here is a list of those who have contributed to the code or the translation of Friendica. Thank you all!'),
-		'$names'  => $arr,
-	));
+		'$names'  => $names,
+	]);
 }
diff --git a/mod/crepair.php b/mod/crepair.php
index 12bfc302f7..94d161dc54 100644
--- a/mod/crepair.php
+++ b/mod/crepair.php
@@ -16,26 +16,17 @@ function crepair_init(App $a)
 		return;
 	}
 
-	$contact_id = 0;
-
+	$contact = null;
 	if (($a->argc == 2) && intval($a->argv[1])) {
-		$contact_id = intval($a->argv[1]);
-		$r = q("SELECT * FROM `contact` WHERE `uid` = %d and `id` = %d LIMIT 1",
-			intval(local_user()),
-			intval($contact_id)
-		);
-		if (!DBM::is_result($r)) {
-			$contact_id = 0;
-		}
+		$contact = dba::selectFirst('contact', [], ['uid' => local_user(), 'id' => $a->argv[1]]);
 	}
 
 	if (!x($a->page, 'aside')) {
 		$a->page['aside'] = '';
 	}
 
-	if ($contact_id) {
-		$a->data['contact'] = $r[0];
-		$contact = $r[0];
+	if (DBM::is_result($contact)) {
+		$a->data['contact'] = $contact;
 		profile_load($a, "", 0, Contact::getDetailsByURL($contact["url"]));
 	}
 }
@@ -48,19 +39,15 @@ function crepair_post(App $a)
 
 	$cid = (($a->argc > 1) ? intval($a->argv[1]) : 0);
 
+	$contact = null;
 	if ($cid) {
-		$r = q("SELECT * FROM `contact` WHERE `id` = %d AND `uid` = %d LIMIT 1",
-			intval($cid),
-			intval(local_user())
-		);
+		$contact = dba::selectFirst('contact', [], ['id' => $cid, 'uid' => local_user()]);
 	}
 
-	if (!DBM::is_result($r)) {
+	if (!DBM::is_result($contact)) {
 		return;
 	}
 
-	$contact = $r[0];
-
 	$name        = defaults($_POST, 'name'       , $contact['name']);
 	$nick        = defaults($_POST, 'nick'       , '');
 	$url         = defaults($_POST, 'url'        , '');
@@ -113,20 +100,16 @@ function crepair_content(App $a)
 
 	$cid = (($a->argc > 1) ? intval($a->argv[1]) : 0);
 
+		$contact = null;
 	if ($cid) {
-		$r = q("SELECT * FROM `contact` WHERE `id` = %d AND `uid` = %d LIMIT 1",
-			intval($cid),
-			intval(local_user())
-		);
+		$contact = dba::selectFirst('contact', [], ['id' => $cid, 'uid' => local_user()]);
 	}
 
-	if (!DBM::is_result($r)) {
+	if (!DBM::is_result($contact)) {
 		notice(t('Contact not found.') . EOL);
 		return;
 	}
 
-	$contact = $r[0];
-
 	$warning = t('<strong>WARNING: This is highly advanced</strong> and if you enter incorrect information your communications with this contact may stop working.');
 	$info = t('Please use your browser \'Back\' button <strong>now</strong> if you are uncertain what to do on this page.');