How to split a string so the last part of string is 3 letters

[AdRock]

I have a string and I want to split it into 2 parts but the last part has to be 3 characters.

 

What it is, is a uk postcode which is in the database like CF127HG and i want to format the output like CF12 7HG

 

How do i do that?

[Jeremysr]

substr() could do it:

 

$first_part = substr($postcode, 0, strlen($postcode)-3);
$second_part = substr($postcode, strlen($postcode)-4);

[AdRock]

Thinking about it, the word doesn't have to be split but a space added to the string before the last 3 characters

[Jeremysr]

You'd still use the substr()'s but concatenate them together with a space in between:

 

$postcode = substr($postcode, 0, strlen($postcode)-3) . ' ' . substr($postcode, strlen($postcode)-4);

[AdRock]

thanks jeremy, worked a treat.  just had to change them both to -3 to allow for smaller postcodes