alaMustache.php

<?php

// Small hackable Mustache inspired templating 

function alaMustache($template, array $values = []){
	$pattern = '/{{(?<BOOLEAN>#|\^)\s*(?P<KEY>[\w\.-]+)\s*}}(?P<BLOCK>.*?)({{\/\s*\2\s*}})/ms';
	$template = preg_replace_callback($pattern, function (array $matches) use ($values) {
		if ($matches['BOOLEAN'] === '#') {
			if (array_key_exists($matches['KEY'], $values) && !empty(trim($values[$matches['KEY']]))) {
				return $matches['BLOCK'];
			}
			return '';
		}
	
		if ($matches['BOOLEAN'] === '^') {
			if (!array_key_exists($matches['KEY'], $values) || empty(trim($values[$matches['KEY']]))) {
				return $matches['BLOCK'];
			}
			return '';
		}
		return $matches[0];
	}, $template);

	$pattern = '/{{{\s*(?P<KEY_HTML>[\w\.-]+)\s*}}}|{{\s*(?P<KEY>[\w\.-]+)\s*}}/m';

	$template = preg_replace_callback($pattern, function (array $matches) use ($values) {
		if ($matches['KEY_HTML'] !== '' && array_key_exists($matches['KEY_HTML'], $values)) {
			return $values[$matches['KEY_HTML']];
		} elseif ($matches['KEY'] !== '' && array_key_exists($matches['KEY'], $values)) {
			return htmlspecialchars($values[$matches['KEY']], ENT_COMPAT | ENT_HTML5, 'UTF-8', false);
		}
		return $matches[0];
		
	}, $template);
  return $template;
}
    
// echo alaMustache("{{ abc }} {{{abc}}} {{^ zzz}}yes{{/ zzz}} {{^abc}}ignore{{/abc }}  {{# zzz}}and ignore{{/ zzz}} {{# abc}}and yes{{/ abc}}", ["abc"=>'0<br/>1']);
// result should be:
// 0
// 1 0<br/>1 yes and yes