standard: Validate sort_type argument in array_unique()

Author: arshidkv12

ext/standard/tests/array/array_unique_invalid_sort_type.phpt

@@ -0,0 +1,19 @@
+--TEST--
+array_unique() throws ValueError on invalid sort_type
+--FILE--
+<?php
+try {
+    array_unique([1, 2, 3], 999);
+} catch (ValueError $e) {
+    echo $e->getMessage(), PHP_EOL;
+}
+
+try {
+    array_unique([1, 2, 3], -1);
+} catch (ValueError $e) {
+    echo $e->getMessage(), PHP_EOL;
+}
+?>
+--EXPECT--
+array_unique(): Argument #2 ($flags) must be one of PHP_SORT_REGULAR, PHP_SORT_NUMERIC, PHP_SORT_STRING, or PHP_SORT_LOCALE_STRING
+array_unique(): Argument #2 ($flags) must be one of PHP_SORT_REGULAR, PHP_SORT_NUMERIC, PHP_SORT_STRING, or PHP_SORT_LOCALE_STRING