PHP popen() Function

The popen() function opens a pipe to the program specified in the command parameter.This function returns FALSE if an error occurs.

resource popen ( string $command , string $mode )

Opens a pipe to a process executed by forking the command given by command.

Example -

If the command to be executed could not be found, a valid resource is returned. This may seem odd, but makes sense; it allows you to access any error message returned by the shell : -

Example -