# `StringParser_BBCode` class documentation

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## 9. Examples

### 9.1 Example

`// Unify line breaks of different operating systems
function convertlinebreaks ($text) {
return preg_replace ("/\015\012|\015|\012/", "\n", $text);
}
// Remove everything but the newline charachter
function bbcode_stripcontents ($text) {
return preg_replace ("/[^\n]/", '', $text);
}
function do_bbcode_url ($action, $attributes, $content, $params, $node_object) {
if (!isset ($attributes['default'])) {
$url = $content;
$text = htmlspecialchars ($content);
} else {
$url = $attributes['default'];
$text = $content;
}
if ($action == 'validate') {
if (substr ($url, 0, 5) == 'data:' || substr ($url, 0, 5) == 'file:'
|| substr ($url, 0, 11) == 'javascript:' || substr ($url, 0, 4) == 'jar:') {
return false;
}
return true;
}
return '<a href="'.htmlspecialchars ($url).'">'.$text.'</a>';
}
// Function to include images
function do_bbcode_img ($action, $attributes, $content, $params, $node_object) {
if ($action == 'validate') {
if (substr ($content, 0, 5) == 'data:' || substr ($content, 0, 5) == 'file:'
|| substr ($content, 0, 11) == 'javascript:' || substr ($content, 0, 4) == 'jar:') {
return false;
}
return true;
}
return '<img src="'.htmlspecialchars($content).'" alt="">';
}
$bbcode = new StringParser_BBCode ();
$bbcode->addFilter (STRINGPARSER_FILTER_PRE, 'convertlinebreaks');
$bbcode->addParser (array ('block', 'inline', 'link', 'listitem'), 'htmlspecialchars');
$bbcode->addParser (array ('block', 'inline', 'link', 'listitem'), 'nl2br');
$bbcode->addParser ('list', 'bbcode_stripcontents');
$bbcode->addCode ('b', 'simple_replace', null, array ('start_tag' => '<b>', 'end_tag' => '</b>'),
'inline', array ('listitem', 'block', 'inline', 'link'), array ());
$bbcode->addCode ('i', 'simple_replace', null, array ('start_tag' => '<i>', 'end_tag' => '</i>'),
'inline', array ('listitem', 'block', 'inline', 'link'), array ());
$bbcode->addCode ('url', 'usecontent?', 'do_bbcode_url', array ('usecontent_param' => 'default'),
'link', array ('listitem', 'block', 'inline'), array ('link'));
$bbcode->addCode ('link', 'callback_replace_single', 'do_bbcode_url', array (),
'link', array ('listitem', 'block', 'inline'), array ('link'));
$bbcode->addCode ('img', 'usecontent', 'do_bbcode_img', array (),
'image', array ('listitem', 'block', 'inline', 'link'), array ());
$bbcode->addCode ('bild', 'usecontent', 'do_bbcode_img', array (),
'image', array ('listitem', 'block', 'inline', 'link'), array ());
$bbcode->setOccurrenceType ('img', 'image');
$bbcode->setOccurrenceType ('bild', 'image');
$bbcode->setMaxOccurrences ('image', 2);
$bbcode->addCode ('list', 'simple_replace', null, array ('start_tag' => '<ul>', 'end_tag' => '</ul>'),
'list', array ('block', 'listitem'), array ());
$bbcode->addCode ('*', 'simple_replace', null, array ('start_tag' => '<li>', 'end_tag' => '</li>'),
'listitem', array ('list'), array ());
$bbcode->setCodeFlag ('*', 'closetag', BBCODE_CLOSETAG_OPTIONAL);
$bbcode->setCodeFlag ('*', 'paragraphs', true);
$bbcode->setCodeFlag ('list', 'paragraph_type', BBCODE_PARAGRAPH_BLOCK_ELEMENT);
$bbcode->setCodeFlag ('list', 'opentag.before.newline', BBCODE_NEWLINE_DROP);
$bbcode->setCodeFlag ('list', 'closetag.before.newline', BBCODE_NEWLINE_DROP);
$bbcode->setRootParagraphHandling (true);
$text = '[b]This is a test![/b]';
echo $bbcode->parse ($text);`

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