Modifiers

Modifiers transform a value before it is output.

How to use modifiers

A modifier follows the variable after a pipe (|). Arguments follow the modifier name after colons (:). Modifiers can be chained: they are applied from left to right, each one receiving the result of the previous one.

{{ $page.post_date|feggDate:'Y/m/d' }}
{{ $page.text|lineStrimWidth:80|br }}

• Any PHP function works as a modifier: {{ $x|name:arg1:arg2 }} calls name($x, arg1, arg2).
• Arguments are PHP expressions: quote strings ('Y/m/d'), and use template variables freely (feggDate:$format). A : or | inside a quoted string is part of the string.
• The result is HTML-escaped like any output, unless noescape is in the chain.
• Modifiers only run when the variable is set: {{ $missing|feggDefault:'-' }} outputs nothing, so use {{ if }} for defaults. Arrays are passed to modifiers ({{ $tags|feggImplode:', ' }}); when the result is still an array, nothing is output.
• An unknown modifier is reported by fegg-cli template:lint (see Lint and errors).

Built into the template engine

noescape

Outputs the value without HTML escaping. Use it only for trusted HTML (CMS rich text written by administrators, messages from your own config). See Security.

Controller

$this->page['foo'] = '<p>bar</p>';

Template

{{ $page.foo }}
{{ $page.foo|noescape }}

Output

<p>bar</p>
<p>bar</p>

br

Escapes the value, then converts newlines to <br /> (nl2br).

Controller

$this->page['foo'] = "First line.\nSecond line.";

Template

{{ $page.foo|br }}

Output

First line.<br />
Second line.

replace

replace:'pattern':'replacement' replaces with mb_ereg_replace(). The pattern is a regular expression, so escape special characters ('\.').

Template

{{ $page.tel|replace:'-':'' }}

Fegg modifiers

Defined in htdocs/_fegg/core/functions/modifier.php.

Modifier	Description
feggDate:'Y/m/d'	Formats a date string or a Unix timestamp with the date() format. Also accepts x / X (Japanese day of the week: 火 / 火曜日) and V / v (Japanese era and year: 令和 / 7). Outputs nothing for an empty or invalid date
feggImplode:', '	Joins an array with the glue
feggDefault:'-'	The replacement when the value is an empty string or an empty array. Does not apply to unset variables
feggCheck:'value':'yes':'no'	'yes' when the value is identical (===) to 'value', otherwise 'no'
feggReplace:'a':'b'	str_replace('a', 'b', $value)
feggPregReplace:'/a/':'b'	preg_replace('/a/', 'b', $value). An optional third argument is the maximum number of replacements
feggUrlParam:$params	Appends query parameters (an array or a string) to a URL, with ? or &
feggUrl	A URL safe for href / src: any scheme other than http, https, mailto and tel (javascript:, data: …) becomes #
feggJs	The value as a JavaScript literal (string, number, array, object, null) with <, >, &, ' and " encoded. Do not put quotes around it. See Security

Controller

$this->page['post_date'] = '2025-04-01 10:00:00';
$this->page['category'] = '1';
$this->page['data']['link'] = 'javascript:alert(1)';
$this->page['query'] = array('category' => 2, 'p' => 3);
$this->setSiteinfo('prefix', '/news/');

Template

{{ $page.post_date|feggDate:'Y年n月j日(x)' }}
<li class="c-tab{{ $page.category|feggCheck:'1':' is-active':'' }}">
<a href="{{ $page.data.link|feggUrl }}">Link</a>
<a href="{{ $site.prefix|feggUrlParam:$page.query }}">Search</a>

Output

2025年4月1日(火)
<li class="c-tab is-active">
<a href="#">Link</a>
<a href="/news/?category=2&amp;p=3">Search</a>

Joining an array

Template

{{ $page.tags|feggImplode:', ' }}

CMS modifiers

Defined in htdocs/_fegg/core/functions/cms-modifier.php and model.php.

Modifier	Description
getImageUrl	URL of a CMS image from its ID
getImageUrl:320	Resized to a width of 320px
getImageUrl:780:360	Resized to 780 × 360px. A third argument changes the crop mode in the file name (default 'i')
getImageUrlFromDB, getImageUrlFromDB:320, getImageUrlFromDB:780:360	URL that generates the image on every request (/cms/image/get/...)
getFileUrl	URL of a CMS file from its ID
getFileRawUrl	Direct URL of the stored file (looks the file up in cms_file)
byteConvert	A byte count as a readable size: 1536 → 1.5 KB
lineStrimWidth:40	Removes tags and newlines, then shortens the text to a display width of 40, adding …. A second argument replaces …
url2link	Turns URLs in text into <a> links. The result is HTML: see the warning below
feggCategoryLabel:'news'	Label of a category ID, from the list news of site/config/category_info.php

Template

<img src="{{ $page.data.image_id|getImageUrl:780:360 }}" alt="">
<a href="{{ $page.data.file_id|getFileUrl }}">Download</a>
<span class="c-label">{{ $post.category|feggCategoryLabel:'news' }}</span>
<p>{{ $post.body|lineStrimWidth:80 }}</p>

warning

url2link returns HTML and does not escape the rest of the text, so it needs noescape. Use it only on trusted text (written by administrators in the CMS), never on user input.

Project modifiers

Put your own modifiers in htdocs/_fegg/site/functions/*.php. These files are loaded automatically after the core's. Every file under htdocs/_fegg/ starts with the direct-access guard.

htdocs/_fegg/site/functions/modifier.php

<?php
defined('FEGG_CORE_DIR') || exit;

function priceFormat($value)
{
    return number_format((int) $value) . ' yen';
}

Template

{{ $page.price|priceFormat }}

The skeleton defines isNew($date, $gap = 2): true when the date is less than $gap days old. Use it in a condition: {{ if isNew($post.post_date) }}NEW{{ end }}.