Using PHP chunk_split() to Split Strings into Fixed‑Size Chunks
This article explains PHP's chunk_split() function, detailing its purpose of dividing a string into fixed-size pieces, describing its parameters (body, chunklen, end), return value, and providing a practical example that formats base64‑encoded data according to RFC 2045.
Daily PHP knowledge sharing introduces the chunk_split() function, which splits a string into smaller chunks.
The function is useful for formatting the output of base64_encode() to comply with RFC 2045, inserting a specified end string after every $chunklen characters.
Parameters
body : the string to be split.
chunklen : the size of each chunk (default 76).
end : the line‑ending sequence to append after each chunk (default "\r\n").
Return value
The function returns the split string.
Example
<?php
// Format $data using RFC 2045 semantics
$new_string = chunk_split(base64_encode($data));
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