PHP Learning Series (1)--String processing function (2)

6. The Chunk_split () function divides the string into a series of smaller parts. This function does not change the original string.

Syntax: Chunk_split (string,length,end)

Parameters:

string--required. Specifies the string to be split.

length--is optional. A number that defines the length of the string block.

end--is optional. A string value that defines what is placed after each string block.

Example 1

This example separates each character and adds "." ：

<? PHP $str = "Hello world!" ; Echo Chunk_split ($str, 1, "." );? >

Output:

H.E.L.L.O. w.o.r.l.d.!.

Example 2

This example splits a string after six characters and adds "...":

<? PHP $str = "Hello world!" ; Echo Chunk_split ($str, 6, "...");? >

Output:

Hello ... world!...

7. The convert_cyr_string () function converts a character from one Cyrillic character to another.

The supported Cyrillic character sets are:

• K-koi8-r
• w-windows-1251
• I-iso8859-5
• a-x-cp866
• d-x-cp866
• M-x-mac-cyrillic

Grammar

Convert_cyr_string (String,from,to)

8. The Convert_uudecode () function decodes a uuencode encoded string.

Syntax: Convert_uudecode (String) example

In this example, we will decode the UUENCODE encoded string by using Convert_uudecode ():

<? PHP $str = ", 2&5l;&\@=v]r;&0a '"; Echo Convert_uudecode ($str);? >

Output:

Hello world!

9. The Convert_uuencode () function encodes a string using the uuencode algorithm.

Syntax: Convert_uuencode (String)

Attention:

This function converts all strings (including binary) to printable strings, ensuring the security of their network transmissions. The string of uuencode is approximately 35% larger than the original string.

Example

In this example, we will encode the string using Convert_uuencode ():

<? PHP $str = "Hello world!" ; Echo Convert_uuencode ($str);? >

Output:

, 2&5l;&\@=v]r;&0a '

10. The Count_chars () function returns information about the characters used in the string.

Grammar

Count_chars (string,mode)

Parameters
Describe

String
Necessary. Specifies the string to check.

Mode

Optional. Specifies the return mode. The default is 0. There are the following different return modes:

• 0-Array, ASCII value is the key name, the number of occurrences is the key value
• 1-Array, ASCII value is the key name, the number of occurrences is a key value, only the number of occurrences greater than 0 is listed
• 2-Array, ASCII value is the key name, the number of occurrences is a key value, only the number of occurrences equal to 0 is listed
• 3-string with all the different characters used
• 4-A string with all the different characters that have not been used

Example 1

In this example, we will use Count_chars () to check the string, with the return mode set to 1:

<? PHP $str = "Hello world!" ; Print_r (count_chars($str, 1));? >

Output:

Array ([+] = 1[33] = 1[72] [1[87] = 1[100] = 1[101] [1[108] = 3[111] and 2[114] + 1)

Example 2

In this example, we will use Count_chars () to check the string, with the return mode set to 3:

<? PHP $str = "Hello world!" ; Echo Count_chars ($str, 3);? >

Output:

! Hwdelor

PHP Learning Series (1)--String processing function (2)