Fix SSL routines:ssl3_get_server_certificate:certificate verify failed

[kandalf]

In one of my websites I use the function

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file_put_contents() but I allways get this error:

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file_get_contents(): SSL operation failed with code 1. OpenSSL Error messages:
error:14090086:SSL routines:ssl3_get_server_certificate:certificate verify failed

Any idea how to solve it?