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Entry Category Count
Documentation

Always do a database backup before performing upgrades, downgrades and installations to add-ons.


Sample Usage:

Total Assigned Categories{exp:entry_category_count entry_id="{entry_id}"
{if {exp:entry_category_count entry_id="{entry_id}"1}
  There are multiple categories assigned to this entry
{
/if} 
{if {exp:entry_category_count entry_id="{entry_id}"== 0}
  There are no categories assigned to this entry
{
/if} 

You can hardcode in an entry ID if you like

{if {exp:entry_category_count entry_id="124"1}
  Your very awesome code here
{
/if}