PHP-Based String operation functions and php string functions

PHP-Based String operation functions and php string functions

1. Search for the character location function:

Strpos ($ str, search, [int]): // search for the first position of search in $ str starting from int; strrpos ($ str, search, [int]): // search for the last occurrence position of search in $ str starting from int

2. Extract sub-character functions (dual-byte)

Submit ($ str, int start [, int length]): // extract a [length string] starting from the strat position in $ str. Strstr ($ str1, $ str2): // search $ str2 from $ str1 (the first position) and extract the string from it to the end. If not, FALSE is returned. Stristr () // The function is the same as that of strstr, but it is case insensitive. Strrchr () // returns from the last searched character. Usage: get the file name in the path

3. Replace string

Str_replace (search, replace, $ str): from $ str, search for search to replace str_irreplace (search, replace, $ str): strtr ($ str, search, replace ): in this function, replace cannot be ""; substr_replace ($ Str, $ rep, $ start [, length]) $ str original string, $ rep new string after replacement, the starting position of $ start and the length of $ length. This parameter is optional.

4. query string length

int strlen($str)

5. Comparison of character Functions

Int strcmp ($ str1, $ str2): $ str1 >=< $ str2 is positive 1, 0, and-1 (string comparison strcasecmp () is the same as above (case-insensitive strnatcmp ("4 ", "14") Comparison string strnatcasecmp () In natural order (same as above, (Case Sensitive)

6. Split into array Functions

Str_split ($ str, len): splits $ str by len Length and returns the array split (search, $ str [, int]): splits $ str by the search character. The returned array 'int' is separated several times, and the following will not be split into explode (search, $ str [, int]).

7. Remove spaces:

Ltrim, rtrim, trim

8. Space Function

Chunk_split ($ str, 2); add a space to the $ str string containing 2 characters;

9. Return the specified character or ascii

Chr, ord

10. functions related to HTML code

Nl2br (): converts \ n to <br>. Strip_tags ($ str [, '<p>']): // remove HTML and PHP tags htmlspecialchars ($ str [, parameter]): // The HTML code parameters output normally on the page are converted.

11. case-insensitive conversion functions

Strtolower ($ str) string to lower case strtoupper ($ str) string to upper case ucfirst ($ str) to convert the first character of the function to upper case ucwords ($ str) converts the first letter of each word to uppercase.

12. Database-related functions

Addslashes ($ str): converts single quotation marks ('), double quotation marks ("), backslash (\), and NUL strings \',\",\\. Magic_quotes_gpc = On automatically escapes the content of the get post cookie. get_magic_quotes_gpc () checks whether magic_quotes_gpcstripslashes () is enabled to remove the backslash from the string.

13. Connection Functions

Implode (str, $ arr) concatenates a string array into a string based on specified characters. The implode () function has an alias function for join.

The above collection of string operation functions self-contained in PHP is all the content shared by the editor. I hope to give you a reference and support for the help house.