This will be a user issue.
There is no difference between explorer/workbench and your integration, they are all using the api (soap or rest).
You have likely created a specific integration user for the integration you are building, but a general user for the explorer/workbench access.
On the user record within salesforce ensure that "Salesforce CRM Content User" option is Checked.
Additionally, if the content is within workspaces/Libraries you should ensure that the integration user is listed as a Member within the Libraries section of Salesforce Content.
manpreet
Best Answer
2 years ago
If I use Force.com explorer or workbench.developerforce.com this query works in those tools:
But when I use PHP it is not returning b.com/tag/results">results: