diff --git a/manual/spam_challenge.php b/manual/spam_challenge.php
index 8f7710ad3..1dbf94b93 100644
--- a/manual/spam_challenge.php
+++ b/manual/spam_challenge.php
@@ -39,7 +39,7 @@ $challenges = array(
 // generate a challenge
 function gen_challenge() {
 	global $challenges, $nums;
-	$c = $challenges[rand(0, sizeof($challenges)-1)];
+	$c = $challenges[rand(0, count($challenges)-1)];
 
 	$a  = rand(0, 9);
 	$an = $nums[$a];
diff --git a/mirror-info.php b/mirror-info.php
index cee36ffc8..fdec4629f 100644
--- a/mirror-info.php
+++ b/mirror-info.php
@@ -31,7 +31,7 @@ $sqlite = get_available_sqlites();
 
 $exts = implode(',', get_loaded_extensions());
 
-echo join('|', array(
+echo implode('|', array(
     $MYSITE,            	// 0 : CNAME for mirror as accessed (CC, CC1, etc.)
     phpversion(),       	// 1 : PHP version overview
     $LAST_UPDATED,      	// 2 : Update problems
diff --git a/my.php b/my.php
index 67fd2bdeb..fd0ddc0bf 100644
--- a/my.php
+++ b/my.php
@@ -47,7 +47,7 @@ foreach ($langs as $code => $name) {
 
 // Assemble form from collected data
 $langpref = "<select name=\"my_lang\">\n" .
-            join("", $options) . "</select>\n";
+            implode("", $options) . "</select>\n";
 
 // Save URL shortcut fallback setting
 if (isset($_POST['urlsearch'])) {