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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

Find a PHP function

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Document created the 30/01/2003, last modified the 26/10/2018
Source of the printed document:https://www.gaudry.be/en/php-rf-internals2.opcodes.html

The infobrol is a personal site whose content is my sole responsibility. The text is available under CreativeCommons license (BY-NC-SA). More info on the terms of use and the author.

References

Manuel PHP : http://php.net

These references and links indicate documents consulted during the writing of this page, or which may provide additional information, but the authors of these sources can not be held responsible for the content of this page.
The author This site is solely responsible for the way in which the various concepts, and the freedoms that are taken with the reference works, are presented here. Remember that you must cross multiple source information to reduce the risk of errors.

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