Co-routines can be done as objects instead.

co-routines compared to class

<?php

function loggerCoroutine(){
 
    // set something up
    $fileHandle = fopen($fileName, 'a');
    
    while($continue == true){
        //Do something
        fwrite($fileHandle, yield . "\n");
    }

    //close everything down
    fclose($fileHandle);
}


class Logger{
    
    private $fileHandle;
    
    function __construct(){
        // set something up
        $this->fileHandle = fopen($fileName, 'a');
    }
    
    function write($line){
        //Do something
        fwrite($this->fileHandle, yield . "\n");
    }
 
    function close(){
        //close everything down
        fclose($this->fileHandle);
    }
}