diff --git a/install/install_db.php b/install/install_db.php
index cd20e9080..bc0207763 100644
--- a/install/install_db.php
+++ b/install/install_db.php
@@ -292,7 +292,7 @@ for ($i=0; $i<count($tmp_bo_table); $i++)
     // 게시판 테이블 생성
     $file = file("../".G5_ADMIN_DIR."/sql_write.sql");
     $file = get_db_create_replace($file);
-    $sql = implode($file, "\n");
+    $sql = implode('\n', $file);
 
     $create_table = $table_prefix.'write_' . $tmp_bo_table[$i];
 
diff --git a/lib/pbkdf2.compat.php b/lib/pbkdf2.compat.php
index 6bfada1a9..b1e18001b 100644
--- a/lib/pbkdf2.compat.php
+++ b/lib/pbkdf2.compat.php
@@ -46,7 +46,7 @@ function create_hash($password, $force_compat = false)
 {
     // Generate the salt.
     
-    if (function_exists('mcrypt_create_iv')) {
+    if (function_exists('mcrypt_create_iv') && version_compare( PHP_VERSION, '7.2' , '<' ) ) {
         $salt = base64_encode(mcrypt_create_iv(PBKDF2_COMPAT_SALT_BYTES, MCRYPT_DEV_URANDOM));
     } elseif (@file_exists('/dev/urandom') && $fp = @fopen('/dev/urandom', 'r')) {
         $salt = base64_encode(fread($fp, PBKDF2_COMPAT_SALT_BYTES));