Include, calculate string lengths, split strings, find strings, and so on.
1.AddSlashes: String join Slash.
2.bin2hex: binary turns into 16 decimal.
3.Chop: Remove continuous blanks.
4.CHR: The character that returns the ordinal value.
5.chunk_split: Divides the string into small segments.
6.convert_cyr_string: Converts an old Slavic string into another string.
7.crypt: The string is encrypted with DES encoding.
8.echo: Output string.
9.explode: Cut the string.
10.flush: Clear out the output buffer.
11.get_meta_tags: Extract data from all meta tags of the file.
12.htmlspecialchars: Converts special characters into HTML format.
13.htmlentities: Turns all characters into HTML strings.
14.implode: Turns the array into a string.
15.1join: Turns the array into a string.
16.ltrim: Remove continuous blanks.
17.MD5: Computes the MD5 of the string.
18.NL2BR: Converts a newline character to
。
19.ORD: Returns the ordinal value of a character.
20.PARSE_STR: Parses the query string into a variable.
21.print: Output string.
22.PRINTF: Output formatted string.
23.quoted_printable_decode: Converts a QP encoded string into a 8-bit string.
24.QuoteMeta: Add reference symbol.
25.rawurldecode: Restore from a URL-specific format string to a normal string.
26.rawurlencode: Encodes a string into a URL-specific format.
27.setlocale: Configure geo-information.
28.similar_text: Calculates the similarity of strings.
29.soundex: Calculates the phonetic value of a string
30.SPRINTF: Format the string.
31.STRCHR: Look for the first occurrence of the character.
32.STRCMP: string comparison.
33.STRCSPN: Length of different strings.
34.strip_tags: Remove HTML and PHP markup.
35.strlen: Gets the string length.
36.strrpos: Looks for a character in the string where the last occurrence occurs.
37.strpos: Looks for a character in the string that appears first.
38.STRRCHR: Gets the string that appears at the last occurrence of a character.
39.strrev: Reverses the string.
40.STRSPN: Find out how many strings fall in another string mask.
41.strstr: Returns the string from the beginning of the string to the end of a string.
42.strtok: Cut the string.
43.strtolower: All strings are converted to lowercase.
44.strtoupper: All strings are capitalized.
45.str_replace: String substitution.
46.STRTR: Converts some characters.
47.SUBSTR: Take a partial string.
48.trim: Truncates the string to the end of the space.
49.ucfirst: capitalizes the first character of the string.
50.ucwords: Capitalize the first letter of each word in the string.
51.StripSlashes: Remove the backslash character.
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