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When you overwrite a php file on a server (say, via SFTP) while it is being processed somewhere (perhaps it's a script that takes several seconds to compelete) does it cancel the currently running script or does that finish out even after the overwrite occurs? I suppose I'm asking: does apache load a php script into memory before executing it (and does it hold on to that in memory for the duration of execution)?
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A PHP file is a plain text file, so you can open it in any text editor like VI, Notepad, or Sublime Text. For beginners, tools like Notepad++ should do, since they'll just be running small snippets of code.
That is, PHP is a server side language - it runs on the server and its interaction with the client is limited to sending it a web page.
If you started it in background use ps aux | grep time. php to get PID. Then just kill PID . If process started in foreground, use to interrupt it.
Whenever a PHP application rebuilds MySQL indexes, the process may run for a long time. Generally, allowing a PHP script to run forever is not desirable.
does apache load a php script into memory before executing it (and does it hold on to that in memory for the duration of execution)?
Yes.
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Nothing at all. The script has already been loaded into memory in its compiled state - no matter how much time it takes, the web server won't load the new file unless you refresh the page.
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