Merge branch 'PHP-7.4'

Author: Girgias

ext/mbstring/tests/bug79441.phpt

@@ -0,0 +1,17 @@
+--TEST--
+Bug #79441 Segfault in mb_chr() if internal encoding is unsupported
+--SKIPIF--
+<?php extension_loaded('mbstring') or die('skip mbstring not available'); ?>
+--FILE--
+<?php
+
+mb_internal_encoding("utf-7");
+try {
+    mb_chr(0xd800);
+} catch (\ValueError $e) {
+    echo $e->getMessage() . \PHP_EOL;
+}
+
+?>
+--EXPECT--
+mb_chr() does not support the "UTF-7" encoding