PHP - ob_start example

Example 1

    
    ob_start(); // captures the output and save it in an internal buffer
    echo("world!"); // "world!" saved in internal buffer
    $output = ob_get_contents(); // save in a variable internal buffer content
    ob_end_clean(); // clean internal buffer
    echo 'Hello ' . $output;
    // output
    // Hello world!
    

Example 2

    
    ob_start();
    echo("Hello world!");
    $output = ob_get_contents();
    ob_end_flush(); // print internal buffer content
    // output
    // Hello world!