Nature Med. PubMed Article Google Scholar. Naaber, P. Lancet Reg. Health Eur. Article Google Scholar. Thomas, S. Pegu, A. Science , — Goel, R. Turner, J. Nature , — Goldberg, Y. Bar-On, Y. Chemaitelly, H. Puranik, A. Rella, S. Download references. Career Guide 10 NOV News 08 NOV News 11 NOV Article 10 NOV University of Lethbridge. There is no difference in PHP running on a server. When a web request is made to the script, the script runs till the end of the script, or until it crashes or has a time-out and possibly other similar issues.
AJAX doesn't run server side. AJAX is another client side asynchronous call to a server resource. Everything that's done for the first request as far as authentication, validation, input checking, etc has to be done with every subsequent request.
The only time a program will "persist" is if it has been told to keep going. PHP can be told to wait, and perform actions via web sockets, but that seems to be outside the scope of your question. The "PHP run" is always from start of execution untill the end of the script.
The static variables instantiated earlier do not have a persistant state and will be redefined. Either static variables or not It depends on the server setup. Typically, when you make a request, the PHP interpreter is loaded, parses the script, your server spits out the results and the interpreter is destroyed.
This happens for each request, regardless of whether it originates from a user browsing or AJAX. What this means is that "static" variables are only valid until the interpreter is destroyed, which again, is at the end of every request. HTTP is stateless. Are you referring to a redirect? In that case, it's a new request. With an include, PHP simply loads and executes the file in the same context as the originating script.
The PHP static that could be considered "global" in a procedural way doesn't persist in any of your cases. Learn more here. Coronavirus reinfection: How long might 'natural immunity' last? Share on Pinterest A new study asks how long natural immunity might last. Analyzing the data. Minimizing risk. Adolescent depression: Could school screening help? Related Coverage. DNA vs. The Pfizer vaccine for coronavirus. This is a fall from 60, new cases from last week, suggesting that we are now past the peak of the 3rd wave.
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