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I' never done something like that and I don't even know if it is possible. In my website, I have a .php file that reads a .json file and update the database according to this .json.
I want the server to execute this .php script every hour(or something like that).
Is that possible? How do I do that? If it is impossible, why?
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Yes, this is absolutely possible, assuming you have php5-cli installed.
Just type crontab -e, and then add the following line. This will cause php to be run with your script as an argument every hour, on the hour.
0 * * * * php path/to/MyScript.php
Alternately, you can put #!/usr/bin/php at the top of your script, do chmod +x MyScript.php and replace the line above the following.
0 * * * * path/to/MyScript.php