PHP part functions to organize and share

This article is mainly to share with you the PHP part of the function of sharing, hope to help everyone.

1.Gettype (): get variable type

2.is_array (): Determines whether a variable is an array type

3.is_double (): Determines whether the variable is a double floating-point number type

4.is_float (): Determines whether the variable is a floating-point number type

5.is_int (): Determines whether the variable is an integer type

6.is_integer (): Determines whether the variable is an integer type

7.is_long (): Determine if the variable is a long integer type

8.is_object (): Determine if the variable is an object type

9.is_string (): Determine if the variable is a string type

10.Echo function: Output one or more strings

11.Print function : output one or more strings

12.Die function: The alias function of the function exit () function

13.Printf function: This function is used to output formatted string

Note: The first function is required, is the specified string, and how to format the variable.

14.Trim function: Used to remove spaces at the beginning and end of a string, and returns a string after the space is stripped .

15.Ltrim function: This function is the same as the Trim () function , removing only specific characters to the left of the string.

16.Rtrim function: This function is the same as the Trim () function to only remove specific characters to the right of the string .

17.str_pad () function: Fill the string as required

Note: The function has four parameters, the first parameter is a required option, the second parameter is also a required option, the third function specifies the string to fill with, for options, the fourth function specifies the direction to fill.

Example:$input = "Alien";

Echo Str_pad ($input, 10); Output: Alien

18.Addslashes (): Used to add escape characters to special characters in a string .

19.Strlen () function: Gets the length of the string .

20.SUBSTR () function: Returns a substring of a string .

21.NL2BR function: Insert the HTML line break "<br>" before each new line "\ n" in the string

22.htmlspecialchars () function: Convert some pre-defined characters to HTML entities

23.STRCMP (): string comparison function , string comparison by byte order

24.STRCASECMP (): string comparison functions can be compared by ignoring the case of letters in a string

25.STRNATCMP (): Compare two strings by natural sorting the function is case-sensitive and uses a formula similar to the strcmp () function

26.substr_replace: String that replaces strings.

27.Strrev: This function can easily flip a string, only valid in English

28.num_format () function: Formats a number by a thousand grouping.

29.MD5 (): A string is encrypted by the MD5 algorithm, and a 32-bit hexadecimal string is returned by default and cannot be decrypted after encryption

30.mb_strlen function: Chinese to English mixed gets the length of the string when calculating the length, the number of characters is calculated instead of the number of bytes

31.mb_substr function: String intercept

32.each function: Returns the current key/value pair in the array and moves the array pointer forward one step

33.list function: Assign the values in the array to some variables

34.explode () Function: Convert a string to an array

35.implode () function: Converts an array to a new string

36.count () function: counts the number of elements in an array or the number of attributes in an object

37.array_search () function: Querying the specified element in an array

38.array_pop function: Gets the last cell in the array

39.array_push function: Adding elements to an array

40.array_unique () function: Used to delete duplicate values in an array the function has only one parameter

41.array_rand () function: randomly extracting array elements

42.sort () Function: Key values ascending sort

43.rsort () Function: Descending order of key values

44.ksort () function: Sort from small to large in order of key name pairs

45.krsort () function: Sort from large to small in order of key names, no array retains the original key name after sorting

46.asort () function: sort the array and keep the index relationship

Arsort () function: reverse sort an array and maintain an index relationship

48.natsort () Function: Sort the array with the " Natural sort " algorithm

49.array_slice: Takes a value out of a condition in the array and returns

50.array_combine: Create a new array by merging two arrays

51.array_merge: Merging one or more arrays into an array

52.foreach: A simple way to iterate through an array, only available for arrays and objects.

53.each: Returns the current key/value of the array and moves the array pointer one step forward.

54.var_dump: Output Variable type.

55.$_server: Information about the storage server

56.$_cookie: COOKIE Information for clients

57.$_session: The SESSION information of the stored program

58.$_files: Storing basic information for uploading files

59.$_get: Store form information submitted in GET mode

60.$_post: Store form information submitted by POST

61.array_values (): get the value of an array

62.array_keys (): get the key name of the array

63.array_flip (): the values in the array are interchanged with the key names (if there are duplicates, the previous overrides will be followed)

64.in_array (): detecting a string in an array

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