Zend Engine 2 Opcodes

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Opcode Descriptions and Examples

When parsing PHP files, Zend Engine 2 generates a series of operation codes, commonly known as "opcodes", representing the function of the code. This part of the manual details those opcodes and their behaviour.

Opcodes may be dumped for a given PHP file using the vld extension (see » https://pecl.php.net/package/vld).

**Opcode List**
Number	Name	Has sample code?
0	NOP	yes
1	ADD	yes
2	SUB	yes
3	MUL	yes
4	DIV	yes
5	MOD	yes
6	SL	yes
7	SR	yes
8	CONCAT	yes
9	BW_OR	yes
10	BW_AND	yes
11	BW_XOR	yes
12	BW_NOT	yes
13	BOOL_NOT	yes
14	BOOL_XOR	yes
15	IS_IDENTICAL	yes
16	IS_NOT_IDENTICAL	yes
17	IS_EQUAL	yes
18	IS_NOT_EQUAL	yes
19	IS_SMALLER	yes
20	IS_SMALLER_OR_EQUAL	yes
21	CAST	yes
22	QM_ASSIGN	yes
23	ASSIGN_ADD	yes
24	ASSIGN_SUB	yes
25	ASSIGN_MUL	yes
26	ASSIGN_DIV	yes
27	ASSIGN_MOD	yes
28	ASSIGN_SL	yes
29	ASSIGN_SR	yes
30	ASSIGN_CONCAT	yes
31	ASSIGN_BW_OR	yes
32	ASSIGN_BW_AND	yes
33	ASSIGN_BW_XOR	yes
34	PRE_INC	yes
35	PRE_DEC	yes
36	POST_INC	yes
37	POST_DEC	yes
38	ASSIGN	yes
39	ASSIGN_REF	yes
40	ECHO	yes
41	PRINT	yes
42	JMP	yes
43	JMPZ	yes
44	JMPNZ	yes
45	JMPZNZ	yes
46	JMPZ_EX	yes
47	JMPNZ_EX	yes
48	CASE	yes
49	SWITCH_FREE	yes
50	BRK	yes
51	CONT	yes
52	BOOL	yes
53	INIT_STRING	yes
54	ADD_CHAR	yes
55	ADD_STRING	yes
56	ADD_VAR	yes
57	BEGIN_SILENCE	yes
58	END_SILENCE	yes
59	INIT_FCALL_BY_NAME	yes
60	DO_FCALL	yes
61	DO_FCALL_BY_NAME	yes
62	RETURN	yes
63	RECV	yes
64	RECV_INIT	yes
65	SEND_VAL	yes
66	SEND_VAR	yes
67	SEND_REF	yes
68	NEW	yes
69	INIT_NS_FCALL_BY_NAME	no
70	FREE	yes
71	INIT_ARRAY	yes
72	ADD_ARRAY_ELEMENT	yes
73	INCLUDE_OR_EVAL	yes
74	UNSET_VAR	yes
75	UNSET_DIM	yes
76	UNSET_OBJ	yes
77	FE_RESET	yes
78	FE_FETCH	yes
79	EXIT	yes
80	FETCH_R	yes
81	FETCH_DIM_R	yes
82	FETCH_OBJ_R	yes
83	FETCH_W	yes
84	FETCH_DIM_W	yes
85	FETCH_OBJ_W	yes
86	FETCH_RW	yes
87	FETCH_DIM_RW	yes
88	FETCH_OBJ_RW	yes
89	FETCH_IS	yes
90	FETCH_DIM_IS	no
91	FETCH_OBJ_IS	no
92	FETCH_FUNC_ARG	yes
93	FETCH_DIM_FUNC_ARG	yes
94	FETCH_OBJ_FUNC_ARG	yes
95	FETCH_UNSET	no
96	FETCH_DIM_UNSET	no
97	FETCH_OBJ_UNSET	no
98	FETCH_DIM_TMP_VAR	yes
99	FETCH_CONSTANT	yes
100	GOTO	no
101	EXT_STMT	yes
102	EXT_FCALL_BEGIN	no
103	EXT_FCALL_END	no
104	EXT_NOP	no
105	TICKS	yes
106	SEND_VAR_NO_REF	no
107	CATCH	yes
108	THROW	yes
109	FETCH_CLASS	yes
110	CLONE	yes
111	RETURN_BY_REF	no
112	INIT_METHOD_CALL	yes
113	INIT_STATIC_METHOD_CALL	yes
114	ISSET_ISEMPTY_VAR	yes
115	ISSET_ISEMPTY_DIM_OBJ	yes
116	ZEND_SEND_VAL_EX	no
117	ZEND_SEND_VAR	no
118	ZEND_INIT_USER_CALL	no
119	ZEND_SEND_ARRAY	no
120	ZEND_SEND_USER	no
121	ZEND_STRLEN	no
122	ZEND_DEFINED	no
123	ZEND_TYPE_CHECK	no
124	ZEND_VERIFY_RETURN_TYPE	no
125	ZEND_FE_RESET_RW	no
126	ZEND_FE_FETCH_RW	no
127	ZEND_FE_FREE	no
128	ZEND_INIT_DYNAMIC_CALL	no
129	ZEND_DO_ICALL	no
130	ZEND_DO_UCALL	no
131	ZEND_DO_FCALL_BY_NAME	no
132	PRE_INC_OBJ	yes
133	PRE_DEC_OBJ	yes
134	POST_INC_OBJ	yes
135	POST_DEC_OBJ	yes
136	ASSIGN_OBJ	yes
137	ZEND_OP_DATA	no
138	INSTANCEOF	yes
139	DECLARE_CLASS	yes
140	DECLARE_INHERITED_CLASS	yes
141	DECLARE_FUNCTION	yes
142	RAISE_ABSTRACT_ERROR	yes
143	DECLARE_CONST	no
144	ADD_INTERFACE	no
145	DECLARE_INHERITED_CLASS_DELAYED	no
146	VERIFY_ABSTRACT_CLASS	no
147	ASSIGN_DIM	yes
148	ISSET_ISEMPTY_PROP_OBJ	yes
149	HANDLE_EXCEPTION	yes
150	USER_OPCODE	no
151	ZEND_ASSERT_CHECK	no
152	ZEND_JMP_SET	no
153	ZEND_DECLARE_LAMBDA_FUNCTION	no
154	ZEND_ADD_TRAIT	no
155	ZEND_BIND_TRAITS	no
156	ZEND_SEPARATE	no
157	ZEND_FETCH_CLASS_NAME	no
158	ZEND_CALL_TRAMPOLINE	no
159	ZEND_DISCARD_EXCEPTION	no
160	ZEND_YIELD	no
161	ZEND_GENERATOR_RETURN	no
162	ZEND_FAST_CALL	no
163	ZEND_FAST_RET	no
164	ZEND_RECV_VARIADIC	no
165	ZEND_SEND_UNPACK	no
166	ZEND_POW	no
167	ZEND_ASSIGN_POW	no
168	ZEND_BIND_GLOBAL	no
169	ZEND_COALESCE	no
170	ZEND_SPACESHIP	no
171	ZEND_DECLARE_ANON_CLASS	no
172	ZEND_DECLARE_ANON_INHERITED_CLASS	no
173	ZEND_FETCH_STATIC_PROP_R	no
174	ZEND_FETCH_STATIC_PROP_W	no
175	ZEND_FETCH_STATIC_PROP_RW	no
176	ZEND_FETCH_STATIC_PROP_IS	no
177	ZEND_FETCH_STATIC_PROP_FUNC_ARG	no
178	ZEND_FETCH_STATIC_PROP_UNSET	no
179	ZEND_UNSET_STATIC_PROP	no
180	ZEND_ISSET_ISEMPTY_STATIC_PROP	no
181	ZEND_FETCH_CLASS_CONSTANT	no
182	ZEND_BIND_LEXICAL	no
183	ZEND_BIND_STATIC	no
184	ZEND_FETCH_THIS	no
185	ZEND_SEND_FUNC_ARG	no
186	ZEND_ISSET_ISEMPTY_THIS	no
187	ZEND_SWITCH_LONG	no
188	ZEND_SWITCH_STRING	no
189	ZEND_IN_ARRAY	no
190	ZEND_COUNT	no
191	ZEND_GET_CLASS	no
192	ZEND_GET_CALLED_CLASS	no
193	ZEND_GET_TYPE	no
194	ZEND_FUNC_NUM_ARGS	no
195	ZEND_FUNC_GET_ARGS	no
196	ZEND_UNSET_CV	no
197	ZEND_ISSET_ISEMPTY_CV	no

Pseudo-opcodes that are used only temporarily during compilation.

**Pseudo-opcodes List**
Number	Name	Has sample code?
253	ZEND_GOTO	no
254	ZEND_BRK	no
255	ZEND_CONT	no

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