<?php

function Gene () {
   foreach ([1, 2, 3] as $int) {
       echo $int.PHP_EOL;
       yield $int;
   }
}


Gene(); // 1
Gene(); // 2
Gene(); // 3

<?php

function Gene () {
  yield 1;
  yield 2;
}

$obj = Gene();

foreach ($obj as $val) {
    echo $val * 3;
}

foreach ($obj as $val) {
    echo $val * 2;
}

<?php

function Gene () {
  yield 1;
}

$Generator = Gene();

foreach ($Generator as $val) {
    echo $val * 3;
    break;
}

foreach ($obj as $val) {
    echo $val * 2;
}