How can PHP be used to execute an external program (such as an executable file) to work with a DLL?

To execute an external program in PHP and work with a DLL, you can use the `exec()` function to run the executable file and interact with the DLL. You can pass arguments to the external program and capture its output or return value for further processing within your PHP script.

// Execute an external program (executable file) that works with a DLL
$exePath = 'path/to/your/program.exe';
$arg1 = 'argument1';
$arg2 = 'argument2';

$output = exec("$exePath $arg1 $arg2");

// Process the output or return value from the external program
echo $output;