diff --git a/ext/oci8/tests/lob_027.phpt b/ext/oci8/tests/lob_027.phpt
new file mode 100644
index 00000000000..de4539e4672
--- /dev/null
+++ b/ext/oci8/tests/lob_027.phpt
@@ -0,0 +1,121 @@
+--TEST--
+oci_lob_truncate()
+--SKIPIF--
+<?php if (!extension_loaded('oci8')) die("skip no oci8 extension"); ?>
+--FILE--
+<?php
+	
+require dirname(__FILE__).'/connect.inc';
+require dirname(__FILE__).'/create_table.inc';
+
+$ora_sql = "INSERT INTO
+                       ".$schema.$table_name." (blob)
+                      VALUES (empty_blob())
+                      RETURNING
+                               blob
+                      INTO :v_blob ";
+
+$statement = oci_parse($c,$ora_sql);
+$blob = oci_new_descriptor($c,OCI_D_LOB);
+oci_bind_by_name($statement,":v_blob", $blob,-1,OCI_B_BLOB);
+oci_execute($statement, OCI_DEFAULT);
+
+var_dump($blob);
+
+$str = b"this is a biiiig faaat test string. why are you reading it, I wonder? =)";
+var_dump($blob->write($str));
+
+oci_commit($c);
+
+$select_sql = "SELECT blob FROM ".$schema.$table_name." FOR UPDATE";
+$s = oci_parse($c, $select_sql);
+oci_execute($s, OCI_DEFAULT);
+
+var_dump($row = oci_fetch_array($s));
+oci_commit($c);
+
+for ($i = 5; $i >= 0; $i--) {
+
+	$select_sql = "SELECT blob FROM ".$schema.$table_name." FOR UPDATE";
+	$s = oci_parse($c, $select_sql);
+	oci_execute($s, OCI_DEFAULT);
+
+	$row = oci_fetch_array($s);
+	var_dump($row['BLOB']->load());
+	var_dump($row['BLOB']->truncate(($i-1)*10));
+	
+	oci_commit($c);
+}
+
+
+require dirname(__FILE__).'/drop_table.inc';
+
+echo "Done\n";
+
+?>
+--EXPECTF--
+object(OCI-Lob)#%d (1) {
+  ["descriptor"]=>
+  resource(%d) of type (oci8 descriptor)
+}
+int(72)
+array(2) {
+  [0]=>
+  object(OCI-Lob)#%d (1) {
+    ["descriptor"]=>
+    resource(%d) of type (oci8 descriptor)
+  }
+  ["BLOB"]=>
+  object(OCI-Lob)#%d (1) {
+    ["descriptor"]=>
+    resource(%d) of type (oci8 descriptor)
+  }
+}
+string(72) "this is a biiiig faaat test string. why are you reading it, I wonder? =)"
+bool(true)
+string(40) "this is a biiiig faaat test string. why "
+bool(true)
+string(30) "this is a biiiig faaat test st"
+bool(true)
+string(20) "this is a biiiig faa"
+bool(true)
+string(10) "this is a "
+bool(true)
+string(0) ""
+
+Warning: OCI-Lob::truncate(): Length must be greater than or equal to zero in %s on line %d
+bool(false)
+Done
+--UEXPECTF--
+object(OCI-Lob)#%d (1) {
+  [u"descriptor"]=>
+  resource(%d) of type (oci8 descriptor)
+}
+int(72)
+array(2) {
+  [0]=>
+  object(OCI-Lob)#%d (1) {
+    [u"descriptor"]=>
+    resource(%d) of type (oci8 descriptor)
+  }
+  [u"BLOB"]=>
+  object(OCI-Lob)#%d (1) {
+    [u"descriptor"]=>
+    resource(%d) of type (oci8 descriptor)
+  }
+}
+string(72) "this is a biiiig faaat test string. why are you reading it, I wonder? =)"
+bool(true)
+string(40) "this is a biiiig faaat test string. why "
+bool(true)
+string(30) "this is a biiiig faaat test st"
+bool(true)
+string(20) "this is a biiiig faa"
+bool(true)
+string(10) "this is a "
+bool(true)
+string(0) ""
+
+Warning: OCI-Lob::truncate(): Length must be greater than or equal to zero in %s on line %d
+bool(false)
+Done