A simple buffer accumulator. Slightly inspired by Twig and Plates Section

example.php

<h1>Phonograph Usage Example</h1>

<?php Phonograph::start('a-block') ?>
<h1 style="color: red">This is the output</h1>
<p>Just another paragraph</p>
<?php Phonograph::stop();?>

<?= Phonograph::play('a-block');//print as is ?>

<?php Phonograph::start('another-block') ?>
<h1 style="color: red;">ALL THE TAGS WILL BE <strong>REMOVED</strong></h1>
<p>And The case will be changed to lower</p>
<?php Phonograph::stop();?>

<?= Phonograph::play('another-block',['effects' => 'strtolower|strip_tags']);//printing applying effects as pipe separated functions?>
<br>

<?= Phonograph::play('another-block',['effects' => function($output){
    return str_replace('removed', 'ignored',strtolower($output));
}]);//effets is a callable ... in case we need more flexibility ?>
<br>

<h3>Output accumulated</h3>
<?php for($i=0; $i<5; ++$i)://printing after each line without cleaning the buffer (gets accumulated) ?>
    <?php Phonograph::start('accumulated') ?>
     Iteration: <?= $i + 1?>.
    <?php Phonograph::stop();?>
    <?= Phonograph::play('accumulated'); ?>
    <br>
<?php endfor ?>

<h3>Output NOT accumulated</h3>
<?php for($i=0; $i<5; ++$i): ?>
    <?php Phonograph::start('not-accumulated') ?>
    Iteration: <?= $i + 1?>.
    <?php Phonograph::stop();?>
    <?= Phonograph::play('not-accumulated',['cleanBuffer' => true]); ?>
    <br>
<?php endfor ?>

Phonograph.php

<?php
/**
 * Just a tiny Wrapper of ob_start / ob_end
 * @author https://github.com/fcamp
 */
class Phonograph
{

    private static $data = [];
    private static $currentName = null;

    /**
     * Start "recording" the buffer
     * @param $regionName string the content block name
     */
    static function start($regionName)
    {
        self::$currentName = $regionName;
        ob_start();
    }

    /**
     * Stop recordings
     */
    static function stop()
    {
        self::$data[self::$currentName] .= ob_get_contents();
        ob_end_clean();
    }

    /**
     * @param string $regionName the name of the content block
     * @param array $options <br>
     * cleanBuffer: if true, cleans the buffer after printing. Default false
     * effects: callable|pipe serparated functions that take the output as parameter and transform it.
     * For example strtolower|ucwords. Default null
     * @return string
     */
    static function play($regionName, array $options = [])
    {
        $settings = array_merge([
            'cleanBuffer' => false,
            'effects' => null,
        ],$options);

        $out = isset(self::$data[$regionName]) ? self::$data[$regionName] : null;
        $settings['cleanBuffer'] && self::$data[$regionName] = null;//cleaning the buffer

        if ($settings['effects']) {
            if(is_callable($settings['effects'])){
                $out = $settings['effects']($out);
            } else {
                foreach (explode('|', $settings['effects']) as $t) {
                    $out = is_callable($t) ? $t($out) : $out;
                }
            }
        }
        return $out;
    }
}