A use case for the pipe operator in PHP (https://wiki.php.net/rfc/pipe-operator)

pipe.php

<?php

function slugify($string)
{
    $string = strtr($string, CharacterMap::get());
    $string = preg_replace('/[^\\p{L}\\d]+/u', '-', $string);
    $string = trim($string, '-');
    $string = iconv('utf-8', 'ASCII//TRANSLIT', $string);
    $string = strtolower($string);
    $string = preg_replace('/[^-\w]+/', '', $string);

    return $string;
}

function slugify($string)
{
    return strtr($string, CharacterMap::get())
        |> preg_replace('/[^\\p{L}\\d]+/u', '-', $$)
        |> trim($$, '-')
        |> iconv('utf-8', 'ASCII//TRANSLIT', $$)
        |> strtolower($$)
        |> preg_replace('/[^-\w]+/', '', $$);
}