php - Super globals, are they common to all clients? -

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are super globals such $_post or $_session common clients or web server have "under hood" method creating new contexts each request?

for example, i'm working on site users can browse content on site must login make changes. login done through ajax. lets imagine 2 users "a" , "b", using different computers, have both logged in , navigate same part of site has form can add information, new concert listing. each form sent via ajax php file processing. because both forms instances of same form keys same. user "a" fills out form , submits first. key:value pairs of form in $_post variable. after user "b" submits form different set of values. did user "b" overwrite of form data in $_post super global user "a" had written?


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