1 files changed, 21 insertions, 0 deletions
diff --git a/ext/standard/tests/bug79821.phpt b/ext/standard/tests/bug79821.phpt
new file mode 100644
index 0000000000..cf1d27e128
--- /dev/null
+++ b/ext/standard/tests/bug79821.phpt
@@ -0,0 +1,21 @@
+--TEST--
+Bug #79821 (array grow during var_dump)
+--FILE--
+<?php
+
+$foo = $bar = [];
+for ($i = 0; $i < 3; $i++) {
+    $foo = [$foo, [&$bar]];
+}
+ob_start(function (string $buffer) use (&$bar) {
+    $bar[][] = null;
+    return '';
+}, 1);
+var_dump($foo[0]);
+ob_end_clean();
+
+echo "OK\n";
+
+?>
+--EXPECT--
+OK