Reference - Parms functions - strrev

[{echo 'abc' exclaim}][{echo 'abc' strrev}]

{set $s = 'ab'/}
{echo php:strrev($s)}

<?php

  $padPhpFunctions = [ 'strrev' ];

?>

{echo 'abc' | php:strrev} {echo 'abc' | strrev}

<?php

  // Fixture for a_request_value_never_decides_what_a_tag_is: a constant, pipe functions, two
  // sequences, a _data file, an application pipe function and PHP functions written as tags
  // and pipes - and $ucwords, a variable the page sets itself, which stays the field it is, as
  // $date does, given a default that keeps the request's value when one came. Fetched bare it
  // answers what the template means by each name.

  $ucwords = 'mine';
  $who     = $who ?? 'nobody';
  $date    = $date ?? '2000-01-01';

  // A name in a comment, a string or a function's parameter is none of the page's: $upper
  // here, '$fibonacci' and $nums below stay the template's, and so does the closure's local
  // $exclaim behind a binary string.

  $tagNamesText   = 'the $fibonacci sequence';
  $tagNamesBinary = b"a binary string for $who";
  $tagNamesLocal  = function ( $nums ) { $exclaim = 1; return $nums; };

?>

[{PHP_INT_SIZE}][{upper}abc{/upper}][{fibonacci rows=3}{$fibonacci}{/fibonacci}][{prime rows=3}{$prime}{/prime}][{nums}{$nums}{/nums}][{exclaim}hi{/exclaim}][{echo 'abc' | strrev}][{strtoupper 'x'}][{ucwords}][{who}][{date}]