PHP Functions Essential Reference

chunk_split

string chunk_split(string string, [int chunk_length], [string chunk_ending]) 

string	String to split into chunks
chunk_length	Length of the chunks (default 76)
chunk_ending	Character(s) to place at the end of each chunk (default \r\n)

Breaks a string into a series of smaller chunks.

Returns:

String with chunk_ending placed every chunk_length

Description:

chunk_split() adds the character(s) specified in chunk_ending every chunk_length characters. This function is useful for breaking certain types of data into separate lines of a specified length. It’s often used to make base64 encoded data conform to RFC 2045.

Note:

This function should not be used for breaking long lines of text into shorter lines for display purposes—use ...