PHP String Functions

Basically PHP came with some predefined string functions to manipulate or to do some required operation on strings.First we will discuss few about string and then we will move to strings functions present in PHP in details.

Strings:

• A string is a series or sequence of characters. e.g "Hello World".
• A character is same as a byte.
• PHP supports 265 sets of character.
• String can be as large as up to 2GB (i.e 2147483647 max)

Strings Functions:

In PHP there are total more than 98 string functions are present as predefine function. Following are the list, that can help you at the time of your project requirements.

1. addcslashes : Quote string with slashes in a C style
2. addslashes : Quote string with slashes
3. bin2hex : Convert binary data into hexadecimal representation
4. chop : Alias of rtrim
5. chr : Return a specific character
6. chunk_split : Split a string into smaller chunks
7. convert_cyr_string : Convert from one Cyrillic character set to another
8. convert_uudecode : Decode a uuencoded string
9. convert_uuencode : Uuencode a string
10. count_chars : Return information about characters used in a string
11. crc32 : Calculates the crc32 polynomial of a string
12. crypt : One:way string hashing
13. echo : Output one or more strings
14. explode : Split a string by string
15. fprintf : Write a formatted string to a stream
16. get_html_translation_table : Returns the translation table used by htmlspecialchars and htmlentities
17. hebrev : Convert logical Hebrew text to visual text
18. hebrevc : Convert logical Hebrew text to visual text with newline conversion
19. hex2bin : Decodes a hexadecimally encoded binary string
20. html_entity_decode : Convert all HTML entities to their applicable characters
21. htmlentities : Convert all applicable characters to HTML entities
22. htmlspecialchars_decode : Convert special HTML entities back to characters
23. htmlspecialchars : Convert special characters to HTML entities
24. implode : Join array elements with a string
25. join : Alias of implode
26. lcfirst : Make a string's first character lowercase
27. levenshtein : Calculate Levenshtein distance between two strings
28. localeconv : Get numeric formatting information
29. ltrim : Strip whitespace (or other characters) from the beginning of a string
30. md5_file : Calculates the md5 hash of a given file
31. md5 : Calculate the md5 hash of a string
32. metaphone : Calculate the metaphone key of a string
33. money_format : Formats a number as a currency string
34. nl_langinfo : Query language and locale information
35. nl2br : Inserts HTML line breaks before all newlines in a string
36. number_format : Format a number with grouped thousands
37. ord : Return ASCII value of character
38. parse_str : Parses the string into variables
39. print : Output a string
40. printf : Output a formatted string
41. quoted_printable_decode : Convert a quoted:printable string to an 8 bit string
42. quoted_printable_encode : Convert a 8 bit string to a quoted:printable string
43. quotemeta : Quote meta characters
44. rtrim : Strip whitespace (or other characters) from the end of a string
45. setlocale : Set locale information
46. sha1_file : Calculate the sha1 hash of a file
47. sha1 : Calculate the sha1 hash of a string
48. similar_text : Calculate the similarity between two strings
49. soundex : Calculate the soundex key of a string
50. sprintf : Return a formatted string
51. sscanf : Parses input from a string according to a format
52. str_getcsv : Parse a CSV string into an array
53. str_ireplace : Case:insensitive version of str_replace.
54. str_pad : Pad a string to a certain length with another string
55. str_repeat : Repeat a string
56. str_replace : Replace all occurrences of the search string with the replacement string
57. str_rot13 : Perform the rot13 transform on a string
58. str_shuffle : Randomly shuffles a string
59. str_split : Convert a string to an array
60. str_word_count : Return information about words used in a string
61. strcasecmp : Binary safe case:insensitive string comparison
62. strchr : Alias of strstr
63. strcmp : Binary safe string comparison
64. strcoll : Locale based string comparison
65. strcspn : Find length of initial segment not matching mask
66. strip_tags : Strip HTML and PHP tags from a string
67. stripcslashes : Un:quote string quoted with addcslashes
68. stripos : Find the position of the first occurrence of a case:insensitive substring in a string
69. stripslashes : Un:quotes a quoted string
70. stristr : Case:insensitive strstr
71. strlen : Get string length
72. strnatcasecmp : Case insensitive string comparisons using a "natural order" algorithm
73. strnatcmp : String comparisons using a "natural order" algorithm
74. strncasecmp : Binary safe case:insensitive string comparison of the first n characters
75. strncmp : Binary safe string comparison of the first n characters
76. strpbrk : Search a string for any of a set of characters
77. strpos : Find the position of the first occurrence of a substring in a string
78. strrchr : Find the last occurrence of a character in a string
79. strrev : Reverse a string
80. strripos : Find the position of the last occurrence of a case:insensitive substring in a string
81. strrpos : Find the position of the last occurrence of a substring in a string
82. strspn : Finds the length of the initial segment of a string consisting entirely of characters contained within a given mask.
83. strstr : Find the first occurrence of a string
84. strtok : Tokenize string
85. strtolower : Make a string lowercase
86. strtoupper : Make a string uppercase
87. strtr : Translate characters or replace substrings
88. substr_compare : Binary safe comparison of two strings from an offset, up to length characters
89. substr_count : Count the number of substring occurrences
90. substr_replace : Replace text within a portion of a string
91. substr : Return part of a string
92. trim : Strip whitespace (or other characters) from the beginning and end of a string
93. ucfirst : Make a string's first character uppercase
94. ucwords : Uppercase the first character of each word in a string
95. vfprintf : Write a formatted string to a stream
96. vprintf : Output a formatted string
97. vsprintf : Return a formatted string
98. wordwrap : Wraps a string to a given number of characters

Note:

Upto now we seen only the list of string functions, later in the same post we will see some string functions from above list in detail with real-time examples.