The Document AI still can be called using PHP as per this issue. For further questions, I recommend reaching out to our PHP developers team.
On Tuesday, April 12, 2022 at 2:14:03 PM UTC-4 Ismail (Cloud Platform Support) wrote:
Hi Ambre,
Currently, Document AI supported client libraries are Java, Node.js and Python. Feel free to submit a feature request via our Public Issue Tracker.
If You are using The library google-cloud-php-document-ai[1] you’ll need to create an issue into the repository of Google Cloud PHP[2].
[1]https://github.com/googleapis/google-cloud-php-document-ai/blob/main/README.md
[2]https://github.com/googleapis/google-cloud-php/issues