content = $content;
$this->keywords = array();
$ids = get_posts( array(
'numberposts' => -1,
'post_type' => 'affiliate_keyword',
'meta_key' => 'enabled',
'meta_value' => 'yes',
'suppress_filters' => false,
'fields' => 'ids'
) );
foreach( $ids as $id ) {
$url = get_post_meta( $id, 'url', true );
if ( !empty( $url ) ) {
if ( $keyword = get_post( $id ) ) {
$search = $keyword->post_title;
$match_case = get_post_meta( $id, 'match_case', true ) == 'yes';
$boundary = get_post_meta( $id, 'boundary', true );
$boundary = empty( $boundary ) || $boundary == 'yes';
$nofollow = get_post_meta( $id, 'nofollow', true ) == 'yes';
if ( $match_case ) {
$case = '';
} else {
$case = 'i';
}
$this->keywords[] = array(
'url' => $url,
'search' => $search,
'case' => $case,
'rel' => $nofollow ? 'nofollow' : '',
'boundary' => $boundary
);
unset( $keyword );
}
}
}
}
/**
* Transforms the content using keyword replacement.
*
* @return string
*/
public function get_content() {
$charset = get_bloginfo( 'charset' );
$d = new DOMDocument( '1.0', $charset );
// Important to have the right encoding. Either like below or using
// sprintf( '', $charset );
$prefix = sprintf( '', $charset );
$suffix = '
';
if ( !empty( $this->keywords ) ) {
foreach( $this->keywords as $keyword ) {
// we need to reconstruct the document after each replacement round
@$d->loadHTML( $prefix . $this->content . $suffix );
if ( $keyword['case'] == 'i' ? stripos( $this->content, $keyword['search'] ) : strpos( $this->content, $keyword['search'] ) ) {
$this->current_keyword = $keyword;
$this->traverse( $d );
$output = $d->saveHTML();
$open = mb_stripos( $output, $prefix );
$close = mb_stripos( $output, $suffix );
$output = mb_substr( $output, $open + strlen( $prefix ), $close - $open - strlen( $prefix ) );
$this->content = html_entity_decode( $output, ENT_QUOTES, $charset );
}
}
}
return $this->content;
}
/**
* Node traversal and content replacement.
*
* @param DOMNode $DOMNode
*/
private function traverse( $DOMNode ) {
if( $DOMNode->hasChildNodes() ){
foreach ( $DOMNode->childNodes as $DOMElement ) {
$nodeName = $DOMNode->nodeName;
$nodeType = $DOMNode->nodeType;
if ( $nodeType == XML_ELEMENT_NODE && $nodeName == 'a' ) {
// skip links so that we don't place a link inside a link
} else {
$this->traverse( $DOMElement );
}
}
} else {
$nodeName = $DOMNode->nodeName;
$nodeType = $DOMNode->nodeType;
if ( $nodeType == XML_TEXT_NODE ) {
if ( !empty( $this->current_keyword ) ) {
$boundary = $this->current_keyword['boundary'] ? '\b' : '';
$DOMNode->nodeValue = mb_ereg_replace(
$boundary . $this->current_keyword['search'] . $boundary,
sprintf(
'\\0',
esc_attr( $this->current_keyword['url'] ),
!empty( $this->current_keyword['rel'] ) ? ' rel="' . esc_attr( $this->current_keyword['rel'] ) . '" ' : ''
),
$DOMNode->nodeValue,
"msr" . $this->current_keyword['case']
);
}
}
}
}
}