Ahí tienes. Esto funciona tanto en WordPress como fuera de WordPress.
<?php
$str = ' I am <strong>stronger</strong> and cooler every single day <aaaaa>. ';
echo orbisius_html_util::strip_tags($str);
/**
* Util HTML class
* @author Svetoslav Marinov (SLAVI) | http://orbisius.com
*/
class orbisius_html_util {
/**
* Uses WP's wp_kses to clear some of the html tags but allow some attribs
* usage: orbisius_html_util::strip_tags($str);
* uses WordPress' wp_kses()
* @param str $buffer string buffer
* @return str cleaned up text
*/
public static function strip_tags($buffer) {
static $default_attribs = array(
'id' => array(),
'class' => array(),
'title' => array(),
'style' => array(),
'data' => array(),
'data-mce-id' => array(),
'data-mce-style' => array(),
'data-mce-bogus' => array(),
);
$allowed_tags = array(
'div' => $default_attribs,
'span' => $default_attribs,
'p' => $default_attribs,
'a' => array_merge( $default_attribs, array(
'href' => array(),
'target' => array('_blank', '_top'),
) ),
'u' => $default_attribs,
'i' => $default_attribs,
'q' => $default_attribs,
'b' => $default_attribs,
'ul' => $default_attribs,
'ol' => $default_attribs,
'li' => $default_attribs,
'br' => $default_attribs,
'hr' => $default_attribs,
'strong' => $default_attribs,
'blockquote' => $default_attribs,
'del' => $default_attribs,
'strike' => $default_attribs,
'em' => $default_attribs,
'code' => $default_attribs,
);
if (function_exists('wp_kses')) { // WP is here
$buffer = wp_kses($buffer, $allowed_tags);
} else {
$tags = array();
foreach (array_keys($allowed_tags) as $tag) {
$tags[] = "<$tag>";
}
$buffer = strip_tags($buffer, join('', $tags));
}
$buffer = trim($buffer);
return $buffer;
}
}