output_buffer.php

<?php

    // Turn off output buffering
    ini_set('output_buffering', 'off');
    // Turn off PHP output compression
    ini_set('zlib.output_compression', false);
             
    //Flush (send) the output buffer and turn off output buffering
    while (@ob_end_flush());
             
    // Implicitly flush the buffer(s)
    ini_set('implicit_flush', true);
    ob_implicit_flush(true);
    echo "add this";
    echo str_pad("",1024," ");
    echo "<br />";
    ob_flush();
    flush();
    sleep(5);        
    echo "Program Output";
    ob_flush();
    flush();