diff --git a/ext/opcache/Optimizer/dfa_pass.c b/ext/opcache/Optimizer/dfa_pass.c
index b5def0b05d2..a6900be36b6 100644
--- a/ext/opcache/Optimizer/dfa_pass.c
+++ b/ext/opcache/Optimizer/dfa_pass.c
@@ -579,6 +579,122 @@ void zend_dfa_optimize_op_array(zend_op_array *op_array, zend_optimizer_ctx *ctx
 			}
 		}
 
+		if (ZEND_FUNC_INFO(op_array)) {
+			zend_func_info *func_info = ZEND_FUNC_INFO(op_array);
+
+			if (func_info->callee_info) {
+				zend_call_info *call_info = func_info->callee_info;
+				static zend_function *in_array_function = NULL;
+
+				if (!in_array_function) {
+					in_array_function = zend_hash_str_find_ptr(CG(function_table), "in_array", sizeof("in_array")-1);
+				}
+				do {
+					if (call_info->callee_func == in_array_function
+					 && (call_info->caller_init_opline->extended_value == 2
+					  || (call_info->caller_init_opline->extended_value == 3
+					   && (call_info->caller_call_opline - 1)->opcode == ZEND_SEND_VAL
+					   && (call_info->caller_call_opline - 1)->op1_type == IS_CONST))) {
+
+						zend_op *send_array;
+						zend_op *send_needly;
+						zend_bool strict = 0;
+
+						if (call_info->caller_init_opline->extended_value == 2) {
+							send_array = call_info->caller_call_opline - 1;
+							send_needly = call_info->caller_call_opline - 2;
+						} else {
+							if (zend_is_true(CT_CONSTANT_EX(op_array, (call_info->caller_call_opline - 1)->op1.constant))) {
+								strict = 1;
+							}
+							send_array = call_info->caller_call_opline - 2;
+							send_needly = call_info->caller_call_opline - 3;
+						}
+
+						if (send_array->opcode == ZEND_SEND_VAL
+						 && send_array->op1_type == IS_CONST
+						 && Z_TYPE_P(CT_CONSTANT_EX(op_array, send_array->op1.constant)) == IS_ARRAY
+						 && (send_needly->opcode == ZEND_SEND_VAL
+						  || send_needly->opcode == ZEND_SEND_VAR)
+					    ) {
+							int ok = 1;
+
+							HashTable *src = Z_ARRVAL_P(CT_CONSTANT_EX(op_array, send_array->op1.constant));
+							HashTable *dst;
+							zval *val, tmp;
+							zend_ulong idx;
+
+							ZVAL_TRUE(&tmp);
+							dst = emalloc(sizeof(HashTable));
+							zend_hash_init(dst, zend_hash_num_elements(src), NULL, ZVAL_PTR_DTOR, 0);
+							if (strict) {
+								ZEND_HASH_FOREACH_VAL(src, val) {
+									if (Z_TYPE_P(val) == IS_STRING) {
+										zend_hash_add(dst, Z_STR_P(val), &tmp);
+									} else if (Z_TYPE_P(val) == IS_LONG) {
+										zend_hash_index_add(dst, Z_LVAL_P(val), &tmp);
+									} else {
+										zend_array_destroy(dst);
+										ok = 0;
+										break;
+									}
+								} ZEND_HASH_FOREACH_END();
+							} else {
+								ZEND_HASH_FOREACH_VAL(src, val) {
+									if (Z_TYPE_P(val) != IS_STRING || ZEND_HANDLE_NUMERIC(Z_STR_P(val), idx)) {
+										zend_array_destroy(dst);
+										ok = 0;
+										break;
+									}
+									zend_hash_add(dst, Z_STR_P(val), &tmp);
+								} ZEND_HASH_FOREACH_END();
+							}
+
+							if (ok) {
+								uint32_t op_num = send_needly - op_array->opcodes;
+								zend_ssa_op *ssa_op = ssa->ops + op_num;
+
+								if (ssa_op->op1_use >= 0) {
+									/* Reconstruct SSA */
+									int var_num = ssa_op->op1_use;
+									zend_ssa_var *var = ssa->vars + var_num;
+
+									ZEND_ASSERT(ssa_op->op1_def < 0);
+									zend_ssa_unlink_use_chain(ssa, op_num, ssa_op->op1_use);
+									ssa_op->op1_use = -1;
+									ssa_op->op1_use_chain = -1;
+									op_num = call_info->caller_call_opline - op_array->opcodes;
+									ssa_op = ssa->ops + op_num;
+									ssa_op->op1_use = var_num;
+									ssa_op->op1_use_chain = var->use_chain;
+									var->use_chain = op_num;
+								}
+
+								ZVAL_ARR(&tmp, dst);
+
+								/* Update opcode */
+								call_info->caller_call_opline->opcode = ZEND_IN_ARRAY;
+								call_info->caller_call_opline->extended_value = strict;
+								call_info->caller_call_opline->op1_type = send_needly->op1_type;
+								call_info->caller_call_opline->op1.num = send_needly->op1.num;
+								call_info->caller_call_opline->op2_type = IS_CONST;
+								call_info->caller_call_opline->op2.constant = zend_optimizer_add_literal(op_array, &tmp);
+								if (call_info->caller_init_opline->extended_value == 3) {
+									MAKE_NOP(call_info->caller_call_opline - 1);
+								}
+								MAKE_NOP(call_info->caller_init_opline);
+								MAKE_NOP(send_needly);
+								MAKE_NOP(send_array);
+								remove_nops = 1;
+
+							}
+						}
+					}
+					call_info = call_info->next_callee;
+				} while (call_info);
+			}
+		}
+
 		if (remove_nops) {
 			zend_ssa_remove_nops(op_array, ssa);
 		}