system() is just like the C
version of the function in that it executes the given command and outputs the result.
If a variable is provided as the second argument, then the
return status code of the executed command will be written to
this variable.
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注: If you start a program using this function and want to leave it running in the background, you have to make sure that the output of that program is redirected to a file or some other output stream or else PHP will hang until the execution of the program ends.
The system() call also tries to
automatically flush the web server's output buffer after each
line of output if PHP is running as a server module.
Returns the last line of the command output on success,
and FALSE on failure.
If you need to execute a command and have all the data
from the command passed directly back without any
interference, use the passthru() function.
See also exec(),
passthru(), popen(),
escapeshellcmd(), and the backtick
operator.