$command (string) Command to execute. $descriptorspec (array) Indexed array of descriptor numbers and their values. &$pipes (array) Indexed array of file pointers that correspond to PHP’s end of any pipes that are created. $cwd (string) Initial working directory for the command. $env (array) Array of environment variables. $other_options (array) Array of additional options (Windows only). @return (string) stripped of any environment variable settings.
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