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  • Hi Dave,

    The “a” means array, which means how many items (array length) it has. This page should give you more idea about it: http://stackoverflow.com/questions/14297926/structure-of-a-serialized-php-string.

    Another method would be using the update_field() function instead. Just make sure that you use the field key instead of the field name.

    I hope this helps 🙂