get string between or get string from to php

helppers.php

<?php

/**
 * Get string between start => end
 * 
 * @param $string
 * @param $start
 * @param $end
 * 
 * @return string
 */
function get_string_between($string, $start, $end)
{
    $string = ' ' . $string;
    $ini = strpos($string, $start);
    if ($ini == 0) return '';
    $ini += strlen($start);
    $len = strpos($string, $end, $ini) - $ini;
    return substr($string, $ini, $len);
}