This is a simple test to show how close and kill works.<?php/** * Test close and kill * - main thread writes to main.log * - second thread writes to thread.log and shutdown.log * - main thread runs 10 seconds, second thread runs 20 seconds * - close will wait until second thread stops * - kill don't waits and kill immediately the second thread */// main threadlogToFile("start");// create a second thread$thread = new parallel\Runtime();$thread->run(function(){ // what to do if thread shuts down register_shutdown_function ( function(){file_put_contents("shutdown.log",date('Y-m-d H:i:s') . "\t last will");} ); // loop and count for 20 seconds $c=0; while ($c++ < 20){ sleep(1); echo $c."|"; file_put_contents("thread.log",date('Y-m-d H:i:s') . "\t" . $c.PHP_EOL, FILE_APPEND); }});// sleep 10 secondssleep(10);// mainthread kills thread immediately//$thread->kill();// mainthread waits on thread$thread->close();logToFile("end");function logToFile($msg){ echo PHP_EOL.$msg.PHP_EOL; file_put_contents("main.log",date('Y-m-d H:i:s') . "\t" . $msg.PHP_EOL, FILE_APPEND);}?>