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<?php function is_array_with_empty_strings_only($array) { if (!is_array($array)) return false; foreach ($array as $element) { if ($element != "") return false; } return true; } var_dump(is_array_with_empty_strings_only(array("", "", "", ""))); ?>
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
bool(true)