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diff --git a/ext/standard/tests/file/bug42560.phpt b/ext/standard/tests/file/bug42560.phpt
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+--TEST--
+Bug #42560 Empty directory argument to tempnam yields open_basedir problems
+--FILE--
+<?php
+$tmpdir = sys_get_temp_dir();
+ini_set('open_basedir', $tmpdir);
+$tempnam = tempnam('', 'test');
+var_dump($tempnam !== false);
+var_dump(file_exists($tempnam));
+
+if (file_exists($tempnam)) {
+ unlink($tempnam);
+}
+?>
+--EXPECT--
+bool(true)
+bool(true)