Allow array_diff() and array_intersect() with single array argument

Both of these functions are well-defined when used with a single
array argument -- rejecting this case was an artificial limitation.
This is not useful when called with explicit arguments, but removes
edge-cases when used with argument unpacking:

    // OK even if $excludes is empty.
    array_diff($array, ...$excludes);

    // OK even if $arrays contains a single array only.
    array_intersect(...$arrays);

This matches the behavior of functions like array_merge() and
array_push(), which also allow calls with no array or a single
array respectively.

Closes GH-6097.

1 files changed, 52 insertions, 52 deletions

diff --git a/ext/standard/tests/array/array_intersect_ukey_variation2.phpt b/ext/standard/tests/array/array_intersect_ukey_variation2.phpt
index 7dd5d4c459..bdc0686774 100644
--- a/ext/standard/tests/array/array_intersect_ukey_variation2.phpt
+++ b/ext/standard/tests/array/array_intersect_ukey_variation2.phpt
@@ -113,105 +113,105 @@ fclose($fp);
 *** Testing array_intersect_ukey() : usage variation ***
 
 --int 0--
-array_intersect_ukey(): Argument #2 ($array2) must be of type array, int given
-array_intersect_ukey(): Argument #2 ($array2) must be of type array, int given
+array_intersect_ukey(): Argument #2 must be of type array, int given
+array_intersect_ukey(): Argument #2 must be of type array, int given
 
 --int 1--
-array_intersect_ukey(): Argument #2 ($array2) must be of type array, int given
-array_intersect_ukey(): Argument #2 ($array2) must be of type array, int given
+array_intersect_ukey(): Argument #2 must be of type array, int given
+array_intersect_ukey(): Argument #2 must be of type array, int given
 
 --int 12345--
-array_intersect_ukey(): Argument #2 ($array2) must be of type array, int given
-array_intersect_ukey(): Argument #2 ($array2) must be of type array, int given
+array_intersect_ukey(): Argument #2 must be of type array, int given
+array_intersect_ukey(): Argument #2 must be of type array, int given
 
 --int -12345--
-array_intersect_ukey(): Argument #2 ($array2) must be of type array, int given
-array_intersect_ukey(): Argument #2 ($array2) must be of type array, int given
+array_intersect_ukey(): Argument #2 must be of type array, int given
+array_intersect_ukey(): Argument #2 must be of type array, int given
 
 --float 10.5--
-array_intersect_ukey(): Argument #2 ($array2) must be of type array, float given
-array_intersect_ukey(): Argument #2 ($array2) must be of type array, float given
+array_intersect_ukey(): Argument #2 must be of type array, float given
+array_intersect_ukey(): Argument #2 must be of type array, float given
 
 --float -10.5--
-array_intersect_ukey(): Argument #2 ($array2) must be of type array, float given
-array_intersect_ukey(): Argument #2 ($array2) must be of type array, float given
+array_intersect_ukey(): Argument #2 must be of type array, float given
+array_intersect_ukey(): Argument #2 must be of type array, float given
 
 --float 12.3456789000e10--
-array_intersect_ukey(): Argument #2 ($array2) must be of type array, float given
-array_intersect_ukey(): Argument #2 ($array2) must be of type array, float given
+array_intersect_ukey(): Argument #2 must be of type array, float given
+array_intersect_ukey(): Argument #2 must be of type array, float given
 
 --float -12.3456789000e10--
-array_intersect_ukey(): Argument #2 ($array2) must be of type array, float given
-array_intersect_ukey(): Argument #2 ($array2) must be of type array, float given
+array_intersect_ukey(): Argument #2 must be of type array, float given
+array_intersect_ukey(): Argument #2 must be of type array, float given
 
 --float .5--
-array_intersect_ukey(): Argument #2 ($array2) must be of type array, float given
-array_intersect_ukey(): Argument #2 ($array2) must be of type array, float given
+array_intersect_ukey(): Argument #2 must be of type array, float given
+array_intersect_ukey(): Argument #2 must be of type array, float given
 
 --uppercase NULL--
-array_intersect_ukey(): Argument #2 ($array2) must be of type array, null given
-array_intersect_ukey(): Argument #2 ($array2) must be of type array, null given
+array_intersect_ukey(): Argument #2 must be of type array, null given
+array_intersect_ukey(): Argument #2 must be of type array, null given
 
 --lowercase null--
-array_intersect_ukey(): Argument #2 ($array2) must be of type array, null given
-array_intersect_ukey(): Argument #2 ($array2) must be of type array, null given
+array_intersect_ukey(): Argument #2 must be of type array, null given
+array_intersect_ukey(): Argument #2 must be of type array, null given
 
 --lowercase true--
-array_intersect_ukey(): Argument #2 ($array2) must be of type array, bool given
-array_intersect_ukey(): Argument #2 ($array2) must be of type array, bool given
+array_intersect_ukey(): Argument #2 must be of type array, bool given
+array_intersect_ukey(): Argument #2 must be of type array, bool given
 
 --lowercase false--
-array_intersect_ukey(): Argument #2 ($array2) must be of type array, bool given
-array_intersect_ukey(): Argument #2 ($array2) must be of type array, bool given
+array_intersect_ukey(): Argument #2 must be of type array, bool given
+array_intersect_ukey(): Argument #2 must be of type array, bool given
 
 --uppercase TRUE--
-array_intersect_ukey(): Argument #2 ($array2) must be of type array, bool given
-array_intersect_ukey(): Argument #2 ($array2) must be of type array, bool given
+array_intersect_ukey(): Argument #2 must be of type array, bool given
+array_intersect_ukey(): Argument #2 must be of type array, bool given
 
 --uppercase FALSE--
-array_intersect_ukey(): Argument #2 ($array2) must be of type array, bool given
-array_intersect_ukey(): Argument #2 ($array2) must be of type array, bool given
+array_intersect_ukey(): Argument #2 must be of type array, bool given
+array_intersect_ukey(): Argument #2 must be of type array, bool given
 
 --empty string DQ--
-array_intersect_ukey(): Argument #2 ($array2) must be of type array, string given
-array_intersect_ukey(): Argument #2 ($array2) must be of type array, string given
+array_intersect_ukey(): Argument #2 must be of type array, string given
+array_intersect_ukey(): Argument #2 must be of type array, string given
 
 --empty string SQ--
-array_intersect_ukey(): Argument #2 ($array2) must be of type array, string given
-array_intersect_ukey(): Argument #2 ($array2) must be of type array, string given
+array_intersect_ukey(): Argument #2 must be of type array, string given
+array_intersect_ukey(): Argument #2 must be of type array, string given
 
 --string DQ--
-array_intersect_ukey(): Argument #2 ($array2) must be of type array, string given
-array_intersect_ukey(): Argument #2 ($array2) must be of type array, string given
+array_intersect_ukey(): Argument #2 must be of type array, string given
+array_intersect_ukey(): Argument #2 must be of type array, string given
 
 --string SQ--
-array_intersect_ukey(): Argument #2 ($array2) must be of type array, string given
-array_intersect_ukey(): Argument #2 ($array2) must be of type array, string given
+array_intersect_ukey(): Argument #2 must be of type array, string given
+array_intersect_ukey(): Argument #2 must be of type array, string given
 
 --mixed case string--
-array_intersect_ukey(): Argument #2 ($array2) must be of type array, string given
-array_intersect_ukey(): Argument #2 ($array2) must be of type array, string given
+array_intersect_ukey(): Argument #2 must be of type array, string given
+array_intersect_ukey(): Argument #2 must be of type array, string given
 
 --heredoc--
-array_intersect_ukey(): Argument #2 ($array2) must be of type array, string given
-array_intersect_ukey(): Argument #2 ($array2) must be of type array, string given
+array_intersect_ukey(): Argument #2 must be of type array, string given
+array_intersect_ukey(): Argument #2 must be of type array, string given
 
 --instance of classWithToString--
-array_intersect_ukey(): Argument #2 ($array2) must be of type array, classWithToString given
-array_intersect_ukey(): Argument #2 ($array2) must be of type array, classWithToString given
+array_intersect_ukey(): Argument #2 must be of type array, classWithToString given
+array_intersect_ukey(): Argument #2 must be of type array, classWithToString given
 
 --instance of classWithoutToString--
-array_intersect_ukey(): Argument #2 ($array2) must be of type array, classWithoutToString given
-array_intersect_ukey(): Argument #2 ($array2) must be of type array, classWithoutToString given
+array_intersect_ukey(): Argument #2 must be of type array, classWithoutToString given
+array_intersect_ukey(): Argument #2 must be of type array, classWithoutToString given
 
 --undefined var--
-array_intersect_ukey(): Argument #2 ($array2) must be of type array, null given
-array_intersect_ukey(): Argument #2 ($array2) must be of type array, null given
+array_intersect_ukey(): Argument #2 must be of type array, null given
+array_intersect_ukey(): Argument #2 must be of type array, null given
 
 --unset var--
-array_intersect_ukey(): Argument #2 ($array2) must be of type array, null given
-array_intersect_ukey(): Argument #2 ($array2) must be of type array, null given
+array_intersect_ukey(): Argument #2 must be of type array, null given
+array_intersect_ukey(): Argument #2 must be of type array, null given
 
 --resource var--
-array_intersect_ukey(): Argument #2 ($array2) must be of type array, resource given
-array_intersect_ukey(): Argument #2 ($array2) must be of type array, resource given
+array_intersect_ukey(): Argument #2 must be of type array, resource given
+array_intersect_ukey(): Argument #2 must be of type array, resource given