php convert text with <br> to JSON format text

index.php

<?php
$daily_reading_in_word = get_field('daily_reading_in_word');
$daily_reading_in_word = trim( preg_replace( '/(\r\n)|\n|\r/', '<br/>', $daily_reading_in_word ) );
$daily_reading_in_word = str_replace('<br/>','\r\n',$daily_reading_in_word);
$daily_reading_in_word = str_replace('<br />','',$daily_reading_in_word);