While the compiler does not have the FBC set for zend_get_call_op, optimizer does, and so incorrectly results in ignoring these flags.

If someone has a better patch, please merge it ASAP, this appears to be correct as I and Nikita originally thought.

Revert "Revert "zend_get_call_op ignoring compiler flags zend_get_call_op will ignore ZEND_COMPILE_IGNORE_USER_FUNCTIONS and ZEND_COMPILE_IGNORE_USER_FUNCTIONS, breaking the intention of these flags""

This reverts commit 0bbbd0f.

Author: krakjoe

UPGRADING.INTERNALS

@@ -17,6 +17,7 @@ PHP 7.4 INTERNALS UPGRADE NOTES
   n. Assignments to references
   o. ZEND_COMPILE_EXTENDED_INFO split
   p. ZEND_EXT_FCALL_BEGIN can access arguments
+  q. ZEND_COMPILE_IGNORE_USER_FUNCTIONS and ZEND_COMPILE_IGNORE_INTERNAL_FUNCTIONS
 
 2. Build system changes
   a. Abstract
@@ -178,6 +179,11 @@ PHP 7.4 INTERNALS UPGRADE NOTES
   p. ZEND_EXT_BEGIN_FCALL is emitted after arguments are sent, this means
      that handlers may access arguments.
 
+  q. ZEND_COMPILE_IGNORE_USER_FUNCTIONS and ZEND_COMPILE_IGNORE_INTERNAL_FUNCTIONS
+     are respected by zend_get_call_op such that when set, the only possible
+     call opcodes are ZEND_DO_FCALL and ZEND_DO_FCALL_BY_NAME, previously they
+     were ignored by zend_get_call_op.
+     
 ========================
 2. Build system changes
 ========================

Zend/zend_compile.c

@@ -3044,15 +3044,15 @@ uint32_t zend_compile_args(zend_ast *ast, zend_function *fbc) /* {{{ */
 ZEND_API zend_uchar zend_get_call_op(const zend_op *init_op, zend_function *fbc) /* {{{ */
 {
 	if (fbc) {
-		if (fbc->type == ZEND_INTERNAL_FUNCTION) {
+		if (fbc->type == ZEND_INTERNAL_FUNCTION && !(CG(compiler_options) & ZEND_COMPILE_IGNORE_INTERNAL_FUNCTIONS)) {
 			if (init_op->opcode == ZEND_INIT_FCALL && !zend_execute_internal) {
 				if (!(fbc->common.fn_flags & (ZEND_ACC_ABSTRACT|ZEND_ACC_DEPRECATED|ZEND_ACC_HAS_TYPE_HINTS|ZEND_ACC_RETURN_REFERENCE))) {
 					return ZEND_DO_ICALL;
 				} else {
 					return ZEND_DO_FCALL_BY_NAME;
 				}
 			}
-		} else {
+		} else if (!(CG(compiler_options) & ZEND_COMPILE_IGNORE_USER_FUNCTIONS)){
 			if (zend_execute_ex == execute_ex && !(fbc->common.fn_flags & ZEND_ACC_ABSTRACT)) {
 				return ZEND_DO_UCALL;
 			}