fixup! Support first-class callables in const-expressions

Author: TimWolla

Zend/tests/closure_const_expr/fcc/case_insensitive.phpt

@@ -0,0 +1,22 @@
+--TEST--
+Allow defining FCC in const expressions with case-insensitive names.
+--FILE--
+<?php
+
+const Closure = StrRev(...);
+
+var_dump(Closure);
+var_dump((Closure)("abc"));
+
+?>
+--EXPECTF--
+object(Closure)#%d (2) {
+  ["function"]=>
+  string(%d) "%s"
+  ["parameter"]=>
+  array(1) {
+    ["$string"]=>
+    string(10) "<required>"
+  }
+}
+string(3) "cba"

Zend/zend_ast.c

@@ -1011,7 +1011,9 @@ ZEND_API zend_result ZEND_FASTCALL zend_ast_evaluate_inner(
 					ZEND_ASSERT(ast->child[1]->kind == ZEND_AST_CALLABLE_CONVERT);
 
 					zend_string *function_name = zend_ast_get_str(ast->child[0]);
-					fptr = zend_fetch_function(function_name);
+					zend_string *function_name_lc = zend_string_tolower(function_name);
+					fptr = zend_fetch_function(function_name_lc);
+					zend_string_release(function_name_lc);
 					if (!fptr) {
 						zend_throw_error(NULL, "Call to undefined function %s()", ZSTR_VAL(function_name));
 						return FAILURE;