master/iframe_8php_source.html

 <?php
 $src = (string) elgg_extract('src', $vars);

 $vars['src'] = elgg_normalize_url($src);

 echo elgg_format_element('iframe', $vars);
$src
$src
Display a page in an embedded window.
Definition: iframe.php:8

elgg_extract
elgg_extract($key, $array, $default=null, bool $strict=true)
Checks for $array[$key] and returns its value if it exists, else returns $default.
Definition: elgglib.php:254

$vars
$vars['src']
Definition: iframe.php:10

elgg_format_element
elgg_format_element(string $tag_name, array $attributes=[], string $text= '', array $options=[])
Format an HTML element.
Definition: output.php:145

elgg_normalize_url
elgg_normalize_url(string $url)
Definition: output.php:163