Computed Field : audio file duration using getID3

To do this in Drupal 7 first install two modules : getID3() and Computed Field.

In the content type that holds the details for each audio track add a field of type 'Computed'
For this field, in the entry 'Computed Field (PHP)' insert the following code:

⋅ Categories: Drupal 7.x, Site builders, computed field, audio, playtime, duration, getID3, Intermediate, No known problems
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