Title: PHP error
Last modified: August 22, 2016

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# PHP error

 *  Resolved [gbell12](https://wordpress.org/support/users/gbell12/)
 * (@gbell12)
 * [11 years, 8 months ago](https://wordpress.org/support/topic/php-error-104/)
 * What would cause this? My wp-content wasn’t group-writable before, but is now.
   Perhaps PB Textbook tried to set something up before and is now upset?
 * `Notice: Undefined index: pb_bisac_subject in /data/www/wordpress/public_html/
   wp-content/plugins/pressbooks-textbook/themes-book/opentextbook/functions.php
   on line 73`
 * [https://wordpress.org/plugins/pressbooks-textbook/](https://wordpress.org/plugins/pressbooks-textbook/)

Viewing 1 replies (of 1 total)

 *  Plugin Author [bdolor](https://wordpress.org/support/users/bdolor/)
 * (@bdolor)
 * [11 years, 6 months ago](https://wordpress.org/support/topic/php-error-104/#post-5246273)
 * Hi, sorry for the late reply — I didn’t set myself up to receive email notifications.
   That’s been rectified.
 * The cause of an ‘undefined index’ notice from PHP, in this particular case, is
   a request for a value from an array `$metadata['pb_bisac_subject']` which is 
   empty, or not defined. At the bottom of the page ‘Book Info’ there is a text 
   field with the label ‘Bisac Subject’. Putting a value in that field will prevent
   the PHP notice from appearing in your log files.

Viewing 1 replies (of 1 total)

The topic ‘PHP error’ is closed to new replies.

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 * 1 reply
 * 2 participants
 * Last reply from: [bdolor](https://wordpress.org/support/users/bdolor/)
 * Last activity: [11 years, 6 months ago](https://wordpress.org/support/topic/php-error-104/#post-5246273)
 * Status: resolved