PHP String Functions

1. Format the OUTPUT function:

1.ltrim () Remove left space

2.rtrim () Remove right space

3.trim () Remove both spaces

4.str_pad () fills the string as a new function

5.strtolower () Converts a string to lowercase

6.strtoupper () Convert string to uppercase

7.ucfirst () capitalize the first character in a string

8.Ucwords () capitalize the first letter of each word in the string

9.NL2BR () inserts each new line in the string before the HTML entity

10.htmlentities () Convert string to HTML entity

11.htmlspeciachars () Convert some pre-defined strings to HTML entities

12.Strislashes () Remove backslashes added by the addcsashes () function

13.strip_tags () strips HTML xml and PHP tags

14.number_format () formatting numbers with thousands of groups

15.strrev () Invert string

16.MD5 () computes a string MD5

2. Comparison function:

1.STRCMP ()

2.STRCASECMP () ignores letter case comparisons in strings

　　　　
3. Replace function:

4. Find functions

PHP String Functions