Most used php functions

TOP100 most commonly used PHP functions

This is a foreign language, translated for you. The author analyzed the use of PHP functions in more than 1,900 projects and found the following results. While it is possible that the most common ones are not in this list, we recommend that PHP beginners study these functions carefully.

The original link: https://www.exakat.io/top-100-php-functions/

Here we present the 100 most frequently used PHP native functions, labeled from 1 to 100, based on our code analysis of 1,900 open source PHP projects using the PHP static Analysis tool.

Top100

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

Analysis of the

• The most common PHP functions are string functions, then arrays, then files.
• Click on the link for each function to take a closer look at its documentation, such as the second argument to the count function, to get a better understanding of these functions.
• The above 100 functions have no immediate plans to be discarded.
• Among non-built-in libraries, MBString ranks first, curl second, followed by GD, Filter, and Iconv.
• Md5 still ranks first among encryption functions, followed by Sha1.
• Array, Echo, print, Empty, and isset are not included in this ranking, and they are definitely highly used.
• Database operations are not included in this ranking.
• PHP, in files, reads files much more than it writes them.
• Use key sort more often than value sort.

summary

Generally speaking, I do not like ranking class articles, the main reason for the summary of the translation of this article is that the above functions are every PHP beginners must be able to, as a list of commonly used functions, each function can be clicked directly to the document, if you are not familiar with, please seriously study.

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The 100 PHP functions that you have to know

There is a newer top PHP functions in 2022 here!.

Here is the top 100 PHP functions : it is the list of the most often used PHP native functions.

The functions are named, and ranked from 1 to 100. The other 4500 functions are not ranked now. The frequency column represents how often this function is used across PHP code : the reference corpus is a list of 1900 PHP open source projects. They were audited with Exakat static analysis engine, version 1.2.5. The average is the number of time a function is called within one project. Some function are used in isolation, and others are a staple.

For example, 4 project out of 5 uses the count function, and when used, the function is called around 150 times. It is both a popular and heavily used function.

Click on the link to go to the documentation. Some insight at the bottom of the top 100.

Rank	Function	Frequency	Average
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

top 100 insights

• The most commonly used PHP functions are string functions, and then arrays, then files. (Math is probably out of the scope, as it is mostly based on operators)
• The links leads to the documentation : many of those functions actually evolved and acquired new features : for example, count() ‘s second argument, dirname() ‘s second argument, preg_match() and str_replace() accepting arrays as argument… There are many easter eggs.
• No recently deprecated function is in the top 100.
• ext/mbstring is the first non-core extension to show up; ext/curl is the second; then Gd, filter and iconv.
• md5 is the only widely used crypto function. Sha1 is the second (#147).
• print_r is used somewhere in the code of 1 project out of 3. Somewhere…
• dirname has a high level of usage, due to dirname(dirname(dirname())) calls
• array , echo , print , empty , isset and other language constructs were not counted as functions in this ranking. They are probably trusting the first ranks anyway.
• Several functions should be replaced by operators : array_push , is_object , func_get_arg , chr , call_user_func .
• Quite a lot of calls are devoted to knowing a value’s type
• Databases are not ranked here : they are often using classes, though functions are still frequent. May be another top 100 ?
• PHP code tends to read files more than write them. It also decodes base64
• sorting with keys is more frequent than on values or with keys.
• files are read with file_get_contents , and written with fwrite

Challenges

If you are learning PHP, it is a good idea to review the 100 functions ranked here : they are the features you’ll find the most often when landing on a coding team. They are not the only ones, but you’ll be less surprised when meeting them.

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