connect gmail through php imap? local issuer certificate error [duplicate]

Answer 1

Cannot connect to Gmail: Certificate failure for imap.gmail.com: unable to get local issuer certificate: /C=US/O=Google Inc/CN=Google Internet Authority

The system you execute the code on is missing that certificate. There is not much more that can be said about this by the information you provided with your question. Consult the system documentation of the operating system you have how to install certificates and how to aquire the needed certificate.

See as well:

• Certificate error using IMAP in PHP

Answer 2

This seems to be a certificate issue.

I don't tell you what the certificate issue is nor how to solve it.

However, you can leave your gmail account open to attacks by ignoring that issue disabling the certificate validation:

$hostname = '{imap.gmail.com:993/ssl/novalidate-cert}[Gmail]/All Mail';