Structure of postmeta meta_value for woocommerce product download

In short, this is serialized data and this is how data is stored from a custom field (and many other datastrings) in the db.

s:114 is auto generated and simply means that the value http://localhost/wp-content/uploads/woocommerce_uploads/2014/09/test-file.pdf is a string and is 114 characters long. This is used when the data is read and used. If the URL value changes, the string length will change as the length of the string changes

You will need to go and have a look at data serializing and unserializing

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