What is the difference between using phpsystem functions to execute system commands and directly running commands on a terminal? -SegmentFault

Using phpsystem to execute a PHP file is different from running the file directly in windowscmd. Who knows the difference? Use php system to execute a php File
Different from running the command in windows cmd, who knows the difference?

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Use php system to execute a php File
Different from running the command in windows cmd, who knows the difference?

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Permission, to see what permissions you use to run PHP