Add stream_get_filters() basic functionality

ext/standard/tests/streams/stream_get_filters_basic.phpt

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+--TEST--
+stream_get_filters() basic functionality
+--CREDITS--
+Rodrigo Prado de Jesus <royopa [at] gmail [dot] com>
+User Group: PHPSP #phptestfestbrasil
+--FILE--
+<?php
+/* Open a test file for reading and writing */
+$fp = fopen('stream_test.txt', 'w+');
+
+/* Apply the ROT13 filter to the
+ * write filter chain, but not the
+ * read filter chain */
+$filter = 'string.rot13';
+stream_filter_append($fp, $filter, STREAM_FILTER_WRITE);
+
+/* Get a array with all registered filters */
+$streamlist = stream_get_filters();
+
+/* print the type from return of function stream_get_filters() */
+echo gettype($streamlist) . "\n";
+
+/* Check if the filter "string.rot13" appended earlier is included */
+var_dump(in_array($filter, $streamlist));
+?>
+--EXPECT--
+array
+bool(true)

ext/standard/tests/streams/stream_test.txt

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+This is a test file
+This is a test file
+This is a test file
+This is a test file
+This is a test file