diff --git a/func/main.php b/func/main.php
index 1a932fa71..cf13f3f01 100644
--- a/func/main.php
+++ b/func/main.php
@@ -12,7 +12,7 @@ define('MYVESTA_ERROR_GENERAL', 5);
 
 function myvesta_throw_error($code, $message) {
     global $myvesta_exit_on_error;
-    echo "ERROR: ".$message."\n";
+    if ($message!=='') echo "ERROR: ".$message."\n";
     if ($myvesta_exit_on_error) myvesta_exit($code);
     return $code;
 }
diff --git a/func/string.php b/func/string.php
index 3882c069c..2b6a63d95 100644
--- a/func/string.php
+++ b/func/string.php
@@ -2,6 +2,17 @@
 
 // --- file functions ---
 
+function myvesta_find_in_file($file, $find) {
+    if (!file_exists($file)) return myvesta_throw_error (MYVESTA_ERROR_FILE_DOES_NOT_EXISTS, "File '$file' not found");
+
+    $buf=file_get_contents($file);
+
+    $pos=strpos($buf, $find);
+    if ($pos===false) return myvesta_throw_error (MYVESTA_ERROR_STRING_NOT_FOUND, "");
+
+    return $pos;
+}
+
 function myvesta_replace_in_file($file, $find, $replace) {
     if (!file_exists($file)) return myvesta_throw_error (MYVESTA_ERROR_FILE_DOES_NOT_EXISTS, "File '$file' not found");