Add space after every 4th character

Question

I want to add a space to some output after every 4th character until the end of the string. I tried:

$str = $rows['value']; <? echo substr($str, 0, 4) . ' ' . substr($str, 4); ?> 

Which just got me the space after the first 4 characters.

How can I make it show after every 4th ?

Answer 1

You can use chunk_split ^[docs]:

$str = chunk_split($rows['value'], 4, ' '); 

DEMO

If the length of the string is a multiple of four but you don't want a trailing space, you can pass the result to trim.

Answer 2

Wordwrap does exactly what you want:

echo wordwrap('12345678' , 4 , ' ' , true ) 

will output: 1234 5678

If you want, say, a hyphen after every second digit instead, swap the "4" for a "2", and the space for a hyphen:

echo wordwrap('1234567890' , 2 , '-' , true ) 

will output: 12-34-56-78-90

Reference - wordwrap