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<?php function foo() { for ($i = 11; $i < 12; $i++) { echo 'In generator foo.......',"\n"; $string=(yield $i); if (isset($string)) { echo "generator foo displaying sent data: "; echo "$string\n"; } } echo 'generator done and closed.',"\n"; return; } $generator = foo(); foreach ($generator as $value) { echo "Back in generator object ........\n"; echo "Fetched value is $value\n"; if ($value == 11) { echo "generator object injecting ....\n"; $generator->send('Hello World'); } echo "generator object foo done working!\n"; } var_dump(unset($generator));