What is the difference between php functions and methods?-PHP Problem-php.cn

What is the difference between php functions and methods?

青灯夜游

Release： 2023-03-03 10:28:02

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Difference: 1. Functions exist independently and are defined in the process-oriented part; methods depend on the class and are defined in the object-oriented part. 2. Functions can be regarded as the implementation of an algorithm; methods can be regarded as the implementation of business logic. 3. Class methods can set access permissions and need to be called through objects or classes; functions are public and can be used.

What is the difference between php functions and methods?

The difference between php functions and methods

1. Functions exist alone. It is defined in the process-oriented part; the method depends on the existence of the class and is defined in the object-oriented part.

2. Functions can be regarded as the implementation of an algorithm; methods can be regarded as the implementation of business logic.

3. Class methods can set access permissions and need to be called through objects or classes; functions are public and can be used.

Explanation:

The method is a "function" in the class and can only be called through the object; in particular, the static method of the class can be directly called through the class name Calling,

The function usually mentioned should be a function in the global scope, and can be called directly anywhere after being introduced.

Commonly used PHP built-in functions

排行	函数	频率	平均值
1	count	81.41 %	147.67
2	is_array	77.32 %	117.86
3	substr	74.62 %	142.92
4	in_array	74.16 %	79.55
5	explode	73.19 %	71.51
6	str_replace	72.32 %	101.05
7	implode	72.27 %	66.59
8	strlen	70.07 %	98.32
9	array_merge	69.46 %	64.01
10	strpos	67.98 %	78.18
11	preg_match	67.31 %	76.60
12	sprintf	67.16 %	119.46
13	trim	66.75 %	81.28
14	strtolower	65.99 %	59.62
15	file_exists	65.12 %	45.13
16	is_string	61.39 %	45.10
17	preg_replace	60.27 %	54.28
18	file_get_contents	59.96 %	20.71
19	array_key_exists	59.70 %	57.50
20	array_keys	59.35 %	39.59
21	dirname	56.44 %	54.84
22	function_exists	53.58 %	42.62
23	array_map	53.22 %	19.45
24	get_class	53.12 %	33.07
25	class_exists	52.50 %	23.13
26	is_object	51.94 %	35.35
27	time	51.79 %	41.42
28	json_encode	51.48 %	24.81
29	date	50.72 %	52.18
30	is_null	49.69 %	60.52
31	is_numeric	49.49 %	40.69
32	array_shift	49.49 %	23.28
33	defined	48.72 %	86.82
34	is_dir	48.57 %	22.86
35	json_decode	48.42 %	17.39
36	header	48.16 %	59.71
37	strtoupper	47.80 %	30.95
38	array_values	47.24 %	17.27
39	md5	46.88 %	23.74
40	method_exists	46.73 %	19.05
41	file_put_contents	46.68 %	12.49
42	rtrim	45.91 %	18.08
43	array_pop	45.51 %	20.60
44	unlink	44.59 %	23.55
45	basename	44.59 %	27.23
46	realpath	44.08 %	15.90
47	call_user_func	43.97 %	16.41
48	call_user_func_array	43.92 %	18.40
49	fopen	43.77 %	25.61
50	microtime	43.46 %	14.41
51	fclose	42.85 %	28.36
52	is_int	42.75 %	15.78
53	is_file	42.08 %	20.52
54	array_slice	41.83 %	13.20
55	preg_match_all	40.55 %	14.66
56	ucfirst	40.25 %	17.02
57	intval	40.19 %	88.13
58	str_repeat	40.14 %	19.51
59	serialize	40.14 %	22.05
60	array_filter	39.99 %	13.87
61	mkdir	39.79 %	11.17
62	is_callable	39.43 %	11.94
63	ltrim	39.17 %	10.90
64	ob_start	39.12 %	13.26
65	round	39.07 %	28.56
66	fwrite	38.97 %	23.39
67	array_unique	38.87 %	15.96
68	array_search	38.82 %	14.19
69	reset	38.71 %	20.79
70	array_unshift	38.10 %	10.32
71	parse_url	37.90 %	9.61
72	func_get_args	37.79 %	28.33
73	end	37.49 %	12.70
74	base64_encode	37.39 %	14.15
75	unserialize	37.18 %	18.35
76	max	36.98 %	22.88
77	preg_split	36.98 %	13.27
78	gettype	36.93 %	16.16
79	strrpos	36.67 %	11.95
80	version_compare	36.67 %	14.87
81	array_push	36.67 %	26.18
82	floor	36.11 %	18.78
83	strtotime	36.01 %	27.94
84	htmlspecialchars	35.96 %	51.08
85	ini_get	35.85 %	19.25
86	ini_set	35.60 %	14.49
87	chr	35.34 %	186.97
88	extension_loaded	35.29 %	14.17
89	is_bool	35.24 %	11.44
90	ksort	34.98 %	10.82
91	array_reverse	34.93 %	8.27
92	ord	34.73 %	53.17
93	uniqid	34.68 %	9.83
94	strtr	34.47 %	12.90
95	array_diff	34.32 %	11.13
96	error_reporting	34.17 %	8.99
97	ceil	33.35 %	11.99
98	urlencode	33.30 %	29.63
99	min	32.69 %	18.31
100	print_r	32.64 %	14.12

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