Duplicate posts when posting nulls in records in phpMyAdmin [closed]

Problem is within function query_abstract_post_table where you have '$ids' wrapped in single quotes:

Problem:

$sql = "SELECT * FROM $table_name WHERE ID NOT IN ('$ids')";

In the above example, only the first ID returned in the concatenated string (from the array) will be recognized by the NOT IN clause.

Solution:

$sql = "SELECT * FROM $table_name WHERE ID NOT IN ($ids)";