format a variables value for print

I'm a little lost even what to look for to do this.

With a variable like this:

$var = 'American Express offers individuals online access to its world-class 
Card, Financial, and Travel services, including financial advice, retirement 
planning, air and hotel reservations and more'

I never know how many words will be in the content.

What can I do to format the output info something like 70 characters
per line (not splitting any words) and each line to begin with 4
spaces.


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