Online PHP editor | output for frk6M

<?php <?php // without OB echo 'before_ob' . PHP_EOL; ob_start(); // first level begins // this line will be in $second echo 'second_ob' . PHP_EOL; ob_start(); // second level begins // these 2 lines will be in $first echo 'third_ob' . PHP_EOL; echo '------' . PHP_EOL; $first = ob_get_clean() . 1; // this line will be in second // but w/o previous 2 lines echo '------' . PHP_EOL; $second = ob_get_clean() . 2; // this will output $first consisting of 2 lines. // and $second without them. var_dump($first, $second);