diff --git a/cal.php b/cal.php
index b8f71fd84f..ea4f798ec4 100644
--- a/cal.php
+++ b/cal.php
@@ -173,18 +173,18 @@
      "\n",'<tr>',"\n";
 
 // Print out headers for weekdays
-for ($i = 0; $i < 7; $i++) {
+for ($i = 0; $i < 7; ++$i) {
     echo '<th width="14%">', date("l",mktime(0,0,1,4,$i+1,2001)), "</th>\n";
 }
 echo "</tr>\n<tr>";
 
 // Generate the requisite number of blank days to get things started
-for ($days = $i = date("w",$bom); $i > 0; $i--) {
+for ($days = $i = date("w",$bom); $i > 0; --$i) {
     echo '<td class="notaday">&nbsp;</td>';
 }
 
 // Print out all the days in this month
-for ($i = 1; $i <= date("t",$bom); $i++) {
+for ($i = 1; $i <= date("t",$bom); ++$i) {
 
     // Print out day number and all events for the day
     echo '<td><a class="day" href="/cal.php', "?cm=$cm&amp;cd=$i&amp;cy=$cy",
@@ -197,7 +197,7 @@
 }
 
 // Generate the requisite number of blank days to wrap things up
-for (; $days % 7; $days++) {
+for (; $days % 7; ++$days) {
     echo '<td class="notaday">&nbsp;</td>';
 }
 
diff --git a/images/elephpants.php b/images/elephpants.php
index 361d6c58b9..86b0a8c94c 100644
--- a/images/elephpants.php
+++ b/images/elephpants.php
@@ -74,7 +74,7 @@
         continue;
     }
 
-    $got++;
+    ++$got;
     // add photo to response array.
     $elephpants[] = array(
         'title' => $photo['title'],
diff --git a/manual/vote-note.php b/manual/vote-note.php
index 4a007d56c9..6bd1cb8eae 100644
--- a/manual/vote-note.php
+++ b/manual/vote-note.php
@@ -61,10 +61,10 @@
       }
       else {
         if ($_REQUEST['vote'] === 'up') {
-          $N[$_REQUEST['id']]['votes']['up']++;
+          ++$N[$_REQUEST['id']]['votes']['up'];
         }
         elseif ($_REQUEST['vote'] === 'down') {
-          $N[$_REQUEST['id']]['votes']['down']++;
+          ++$N[$_REQUEST['id']]['votes']['down'];
         }
         $update = $N[$_REQUEST['id']]['votes']['up'] - $N[$_REQUEST['id']]['votes']['down'];
         $hash = substr(md5($_REQUEST['page']), 0, 16);
diff --git a/releases/index.php b/releases/index.php
index e60e36eabe..dd698b0f4d 100644
--- a/releases/index.php
+++ b/releases/index.php
@@ -36,7 +36,7 @@
 						$release['supported_versions'] = $supportedVersions[$ver] ?? [];
 					}
 					$machineReadable[$version] = $release;
-					$count++;
+					++$count;
 				}
 			}
 
@@ -100,7 +100,7 @@
 
 	$i = 0;
 	foreach($a as $ver => $release) {
-		$i++;
+		++$i;
 		mk_rel(
 			$major,
 			$ver,
@@ -172,7 +172,7 @@ function recentEOLBranchesHTML(): string {
 	foreach (get_eol_branches() as $branches) {
 		foreach ($branches as $branch => $detail) {
 			$detail_date = $detail['date'];
-			while (isset($eol[$detail_date])) $detail_date++;
+			while (isset($eol[$detail_date])) ++$detail_date;
 			$eol[$detail_date] = sprintf('<li>%s: %s</li>', $branch, date('j M Y', $detail_date));
 		}
 	}
diff --git a/security/index.php b/security/index.php
index b6d2bc1737..c3719c4d52 100644
--- a/security/index.php
+++ b/security/index.php
@@ -43,7 +43,7 @@
                 $RECORDS[$record_no]["id"] = $record_no;
             }
             $field = null;
-            $record_no++;
+            ++$record_no;
             continue;
         }
         if(preg_match("/^([-\w]+):\s*(.*)/", $s, $m)) {
diff --git a/submit-event.php b/submit-event.php
index 98892a77b8..ce22722300 100644
--- a/submit-event.php
+++ b/submit-event.php
@@ -151,10 +151,10 @@
 if (count($errors)) { display_errors($errors); }
 
 // Generate days and months arrays for form
-for ($i = 1; $i <= 7; $i++) {
+for ($i = 1; $i <= 7; ++$i) {
     $days[$i] = date('l', mktime(12, 0, 0, 4, $i));
 }
-for ($i = 1; $i <= 12; $i++) {
+for ($i = 1; $i <= 12; ++$i) {
     $months[$i] = date('F', mktime(12, 0, 0, $i, 1));
 }